39 results about "Syringaldehyde" patented technology

The invention belongs to the technical field of flame-retardant materials, and particularly relates to preparation of a phosphorus, nitrogen and silicon macromolecular flame retardant and application of the phosphorus, nitrogen and silicon macromolecular flame retardant in epoxy resin. The preparation method comprises the following steps: firstly, carrying out substitution reaction on chlorosilane and syringaldehyde or vanillic aldehyde to synthesize a silicon-containing intermediate, then carrying out Schiff base reaction on the silicon-containing intermediate and an amine compound, and finally carrying out addition reaction on the silicon-containing intermediate and a phosphorus-containing compound to prepare the phosphorus, nitrogen and silicon macromolecular flame retardant. The flame retardant has a good flame-retardant effect, can be used for preparing flame-retardant epoxy resin, can effectively improve the limit oxygen index and the vertical combustion grade of the epoxy resin, and can endow the epoxy resin with good transparency and molten drop resistance.

The invention relates to modified polyamide particles as well as a preparation method and application thereof, and belongs to the technical field of polyamide particles. The modified polyamide particle comprises the following components: polyamide resin, a modified composite filler, a compatibilizer, an antioxidant and a lubricant. The preparation method comprises the following steps: banburying and mixing the polyamide resin, the compatibilizer, the antioxidant and the lubricant, adding the mixture into a double-screw extruder from a main feeding port, adding the modified composite filler from a side feeding port, and carrying out melt extrusion, cooling and pelletizing to obtain the modified polyamide particles. Zirconium oxide is generated on glass fibers, more silane coupling agents are grafted in combination with a tetramethylammonium hydroxide and ethidene diamine compound catalyst, the interface bonding force between the composite filler and polyamide is increased, the surface of the composite filler is modified through syringaldehyde, the compatibility with a polyamide system is increased, and meanwhile, the composite filler can be used for preparing the composite filler. The modified polyamide particles can react with acid anhydride in a styrene-maleic anhydride copolymer, and the mechanical strength of the modified polyamide particles can be improved.

The invention discloses a flame-retardant composite wood board and a preparation method thereof.The preparation method of the composite wood board comprises the following steps that single-layer wood boards are soaked in an aqueous solution containing a first flame retardant and dicyandiamide, after drying, the multiple single-layer wood boards are bonded and pressed through an adhesive, and the flame-retardant composite wood board is prepared; the preparation method of the first flame retardant comprises the following steps: S1: 1, reacting 2-bis (chlorodimethylsilyl) ethane with syringaldehyde in a first organic solvent to prepare an intermediate A; s2, reacting the intermediate A with tyrosine in a second organic solvent to prepare an intermediate B; s3, the intermediate B and phosphorous acid are mixed for a reaction, and the first flame retardant is prepared. The first flame retardant can form covalent bond combination with the wood board, so that the flame retardant property of the treated wood is remarkably improved; and meanwhile, the second flame retardant in the adhesive and the first flame retardant impregnated on the wood board can achieve a synergistic promotion effect, so that the limit oxygen index of the prepared composite wood board is up to 60% or above.

The invention belongs to the field of flame-retardant composite materials, and particularly relates to a multifunctional flame retardant and application thereof in epoxy resin. The method comprises the following steps: firstly, carrying out nucleophilic substitution reaction on tert-butyldimethylsilyl chloride and syringaldehyde to obtain a primary intermediate product; carrying out condensation reaction on the primary intermediate product and an amino-containing compound to form a secondary intermediate product with a Schiff base structure; and finally, carrying out addition reaction on the secondary intermediate product and a specific phosphorus-containing reagent to successfully prepare the target flame retardant. Researches show that the flame retardant is remarkable in efficiency, can effectively improve the limit oxygen index (LOI value) and the vertical combustion test (such as UL-94) grade of a material after being applied to an epoxy resin system, and endows the composite material with excellent light transmission, anti-dripping performance and good ultraviolet shielding characteristic.

The invention discloses a culture medium for promoting growth of bifidobacteria and application of the culture medium. 1L of the culture medium is prepared from the following components: 6.2 to 7.4 g of # imgabs0 # peptone, 1.5 to 2.5 g of soy peptone, 3.0 to 3.8 g of yeast extract powder, 1.0 to 2g of beef extract powder, 8.5 to 9.5 g of digestive serum powder, 0.5 to 1.5 g of bovine liver extract powder, 1.5 to 2.0 g of monopotassium phosphate, 1.5 to 2.5 g of sodium chloride, 0.1 to 0.3 g of L-cysteine, 0.1 to 0.3 g of sodium thioglycolate, 0.05 to 0.12 g of growth promoting factors and the balance of water. The growth promoting factor is periplocin, syringaldehyde, 4-methoxysalicylaldehyde, astragaloside, calycosin or formononetin. The raw materials of the culture medium are easy to obtain, the growth promoting effect on bifidobacterium is good, and time and cost are saved. Bifidobacterium grows fast in the culture medium provided by the invention.

The invention belongs to the technical field of microcapsule corrosion inhibitors, and discloses a microcapsule corrosion inhibitor with pH response and slow release effects and a preparation method and application thereof. The method comprises the following steps: 1) preparing syringaldehyde modified methionine; (2) preparing the octenyl succinic anhydride modified chitosan; 3) dissolving the octenyl succinic anhydride modified chitosan in an acetic acid solution to serve as an internal water phase, and dissolving polylactic acid and syringaldehyde modified methionine in an organic solvent to serve as an oil phase; mixing the internal water phase and the oil phase, and performing ultrasonic treatment to obtain a primary emulsion; polyvinyl alcohol and water are mixed to serve as an outer water phase; adding the external water phase into the primary emulsion, and stirring to obtain a final emulsion; and removing the solvent, removing impurities and drying to obtain the microcapsule. The microcapsule corrosion inhibitor disclosed by the invention has a continuous and stable slow release effect, excellent encapsulation performance and relatively good corrosion resistance and pH response. The corrosion inhibitor disclosed by the invention is used for metal corrosion prevention and anticorrosive paint.

The invention discloses low-caffeine nerve stimulation tea wine and a preparation method thereof, the low-caffeine nerve stimulation tea wine is prepared by blending eucommia wood aged tea wine, cherry wood aged tea wine and cherry wood / Hainan dalbergia odorifera wood aged tea wine with different baking degrees, and the mass ratio of geniposidic acid to salidroside to formononetin in the wine body is (2-30): (1-15): 1. The mass ratio of the genkwanin to the alpinia japonica to the sesamol is (0.5-8): (0.15-6): 1, the mass ratio of the isoliquiritigenin to the vitexin to the syringaldehyde is 1: (0.15-5): (4-18), and the total content of the geniposidic acid, the salidroside, the formononetin, the genkwanin, the alpinia japonica, the sesamol, the isoliquiritigenin, the vitexin and the syringaldehyde in the wine is 40-250 mg / 100 mL. By combining and matching the functional components in the wood and the proportion of the functional components, the antagonistic effect on caffeine nerve stimulation in the tea wine is achieved.

The invention relates to the technical field of bioengineering, in particular to an enzyme-mediator reactor, a preparation method thereof and application of the enzyme-mediator reactor in PFOA defluorination. The preparation method comprises the following steps: preparing a cyclodextrin-polyethylene glycol premixed transparent solution, wherein the cyclodextrin-polyethylene glycol premixed transparent solution comprises cyclodextrin and amino polyethylene glycol; n-carbobenzoxy-L-glutamyl glycine and transglutaminase are added into the cyclodextrin-polyethylene glycol premixed transparent solution for an end capping reaction, a reaction product is subjected to impurity removal and drying, and a cyclodextrin-polyethylene glycol composite material is obtained; enzyme, syringaldehyde and the cyclodextrin-polyethylene glycol composite material are subjected to self-assembly crosslinking in a buffer solution, and the enzyme-mediator reactor is obtained. The prepared enzyme-mediator reactor has the green and environment-friendly characteristics while maintaining the high defluorination rate, and a novel biological catalysis solution is provided for treatment of persistent pollutants.

The invention discloses a degradable environment-friendly flame retardant and a preparation method thereof, and relates to the technical field of flame retardant materials, the degradable environment-friendly flame retardant comprises a three-dimensional dynamic covalent network structure formed by cross-linking cystamine-syringaldehyde Schiff base and phytic acid-syringaldehyde ester; the three-dimensional dynamic covalent network structure is loaded with manganese ions coordinated with phosphate groups in a post-introduction mode, through a phytic acid-cystamine-manganese ion ternary synergistic flame-retardant system, the flame-retardant property is remarkably improved, and meanwhile, based on a triple degradable response mechanism of imine bonds, ester bonds and disulfide bonds, the flame-retardant property is remarkably improved. And the material is endowed with excellent degradability.

This invention relates to the field of functional food technology, and more particularly to the application of safflower honey, or safflower honey extract, in enhancing the activity of alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH). The invention has found that safflower honey, or safflower honey extract, can effectively enhance ADH and ALDH activity, thereby promoting alcohol metabolism and achieving a hangover-relieving effect. Further research on the extract revealed that a mixture of syringaldehyde, riboflavin, lutein, luciferin, and three p-coumaroyl spermidine plays a key role in enhancing ADH and ALDH activity, thus providing an application of this mixture in hangover relief. The application of safflower honey and its extract provided by this invention has high application value for developing foods and health products with hangover-relieving effects.

A process for lignin depolymerization is disclosed herein. The process comprises providing a solution comprising dissolved lignin; adding an oxidation catalyst to the solution comprising dissolved lignin; and heating the solution to provide a depolymerized lignin product. Also disclosed is a depolymerized lignin product comprising at least one or more of the following: vanillin at 15-25 wt. %; apocynin at 6-12 wt. %; acetosyringone at 12-15%; syringaldehyde at 13-30 wt. %; syringic acid at 16-24 wt. %; vanillic acid at 5-15 wt. % for use as a cosmetic ingredient and / or food additive.

The invention relates to an antibacterial and deodorant insole material and a preparation method thereof, and belongs to the technical field of insole materials. The antibacterial and deodorant insole material comprises the following components: EVA, TPU, an antibacterial material, a dispersing agent and a compatilizer, the preparation method comprises the following steps: adding the EVA, the TPU, the antibacterial material, the dispersing agent and the compatilizer into a double-screw extruder, and extruding and granulating to obtain the antibacterial and deodorant insole material. According to the invention, the o-aminobenzoic acid-syringaldehyde composite carrier destroys microbial cell membranes to enhance the sterilization permeation efficiency of nano-silver, and syringaldehyde neutralizes odor molecules to achieve synergistic interaction, so that the integration of dual functions of bacteriostasis and deodorization is realized.

This invention discloses a strain that degrades various lignin-derived aromatic compounds and its application in detoxification of hydrolysate. The strain is classified as *Rhodococcus ethereans*. Rhodococcus ether-eating Strain N1, deposited at the China Center for Type Culture Collection (CCTCC) on August 11, 2022, with accession number CCTCC NO: M 20221270, can degrade p-hydroxybenzoic acid, p-coumaric acid, ferulic acid, vanillin, coniferyl alcohol, and syringaldehyde. After lignin depolymerization, derivative phenolic inhibitors are formed, mainly divided into three types: S-type (syringaldehyde), G-type (ferulic acid), and H-type (p-coumaric acid), which affect the fermentation of the strain. The Rhodococcus bacterium in this invention can efficiently degrade SGH-type monomers, achieving a removal efficiency of up to 68.4% when applied to the biological detoxification of hydrolysate inhibitors. Strain N1 has significant application value in improving the conversion efficiency of lignocellulose hydrolysate and reducing the detoxification cost in industrial production.

The present application relates to a kind of ammonium chloride calcium stick, belong to the technical field of feed.The ammonium chloride calcium stick includes the following components: calcium chloride, calcium sulfate, ammonium chloride, vitamin B6, modified cysteine, syringaldehyde, vitamin D3, sodium tripolyphosphate and solvent.Sodium tripolyphosphate maintains the stability of vitamin D3 and vitamin B6, wherein vitamin B6 inhibits prolactin synthesis, vitamin D3 promotes calcium absorption, prevents low blood calcium and excessive mammary secretion.The present application modifies cysteine by eugenol, increases its stability and dispersibility, and forms electrostatic interaction with sodium tripolyphosphate, forms a stable crosslinking network structure, increases the binding force between the coating layer and the raw material, prevents the loss of effective dry milk ingredients, and achieves better dry milk effect.

Various aspects of this disclosure relate to the simultaneous production and distillation of furfural, 5-(hydroxymethyl)furfural, 5-methylfufural, guaiacol, eugenol, vanillin, 2-methoxy-3-methylphenol, 2-methoxy-4-methylphenol, 2-methoxy-5-methylphenol, syringol, syringaldehyde, 2,6-dimethoxy-3-methylphenol, 2,6-dimethoxy-4-methylphenol, 2,6-dimethylphenol, and / or 2,6-dimethoxy-4-(prop-2-enyl)phenol to produce a distillate comprising one or more of the aforementioned molecules. In selected embodiments, the distillate is produced from a natural product and replicates the flavor and / or aroma of the natural product.

The invention provides a halogen-free phosphorus flame retardant as well as a preparation method and application thereof, and belongs to the technical field of flame retardants. The preparation method comprises the following steps: mixing a hydroxyl-containing compound, an acid-binding agent and an organic solvent to obtain a mixed solution; dropwise adding pyrophosphoryl chloride into the mixed solution, and reacting to obtain a reaction product; and carrying out post-treatment on the reaction product to obtain the halogen-free phosphorus flame retardant. The hydroxyl-containing compound comprises one or more of epoxy butanol, glycidol, syringaldehyde, vanillin and p-hydroxybenzaldehyde. The halogen-free phosphorus-based flame retardant disclosed by the invention is a flame retardant with a new structure and has an epoxy group capable of participating in a co-curing reaction of epoxy resin; the preparation method of the flame retardant is simple, the flame retardant is prepared from hydroxyl-containing compounds such as glycidol and pyrophosphoryl chloride under the action of an organic solvent and an acid-binding agent through a one-step synthesis method, and a target object can be conveniently and rapidly prepared.

The present invention addresses the problem of reducing the bitterness and / or astringency of a wood component in an alcoholic beverage. In the present invention, the pH and acidity of an alcoholic beverage are set to within specific ranges. The bitterness or the astringency caused by at least one compound selected from the group consisting of gallic acid, syringic acid, vanillin, and syringaldehyde can be reduced.

Development of a new beverage having a favorable flavor effect is expected. The present invention provides a beverage comprising a steviol glycoside and syringaldehyde, sinapyl aldehyde, or the combination thereof, wherein the content of syringaldehyde, sinapyl aldehyde, or the combination thereof is 0.001 mg / L to 100 mg / L.

The invention discloses an infrared stealth film material of functionalized polystyrene and a preparation method thereof, and belongs to the technical field of functional material preparation. The infrared stealth film material of functionalized polystyrene is composed of the following components in parts by weight: 53-67 parts of a base film material, 8-12 parts of modified polystyrene, and 0.8-1.3 parts of an adhesive, wherein the base film material is prepared from meta-iodoaniline, trimethylsilyl acetylene, diisopropyl xanthate disulfide, tetramethylammonium hydroxide, polyvinylidene fluoride, and polymethyl methacrylate, and the modified polystyrene is prepared from syringaldehyde, n-butyl bromide, 2,2'-dipyrrolyl methane, 2-thiophene boric acid, and polystyrene cross-linked microspheres. The infrared stealth film material of functionalized polystyrene prepared by the method has excellent stealth performance and mechanical properties.

The invention provides an electrochemical method for pairwise synthesizing syringic acid and adiponitrile. The method comprises the following steps: 1) mixing syringaldehyde, an alkaline electrolyte, an alcohol solvent, an alkyl glycoside surfactant and water, and adding the mixture into an anode chamber of an electrolytic cell; (2) acrylonitrile, phosphate, borate, a quaternary ammonium base surfactant and water are mixed and added into a cathode chamber of the electrolytic cell; and 3) heating the electrolyte in the cathode chamber and the anode chamber of the electrolytic cell, then carrying out an electrolytic reaction, carrying out electrochemical oxidation on syringaldehyde at the anode to synthesize syringic acid, enabling hydrated hydrogen ions to enter the cathode chamber across a membrane, and synthesizing adiponitrile with acrylonitrile at the cathode. The syringic acid synthesis method is clean, environmentally friendly and low in cost, meanwhile, the problem of anode corrosion in the operation process of electrosynthesis of adiponitrile is solved, and the tail gas safety risk caused by oxygen evolution of an anode for synthesis of adiponitrile is eliminated. The method has the advantages of simple steps, high total product yield, low equipment investment, low operation risk, mild reaction conditions, less three wastes and low energy consumption, and is suitable for wide industrial application.

The invention relates to a photocatalytic flow method for the selective fragmentation of lignin, comprising: (i) immobilising a photocatalyst on a support forming a bed, and introducing the support with the immobilised photocatalyst into a column that is transparent to radiation; (ii) and continuously circulating a lignin solution through the column packed with the bed, under illumination, to cause the fragmentation of the lignin, yielding vanillin and syringaldehyde, and such that the method is carried out continuously.

The invention relates to a method for preparing aromatic aldehyde by degrading lignin, which comprises the following steps: firstly, extracting lignin from different sources by an organic solvent method, dissolving the lignin in an organic solvent containing an acidic additive, introducing ozone to carry out ozone oxidative degradation, and then reducing ozone oxide by adopting a reducing agent aqueous solution to obtain the aromatic aldehyde. Finally, the lignin is converted into aromatic aldehyde compounds such as p-hydroxy benzaldehyde, vanillin and syringaldehyde. Compared with the prior art, the method has the advantages that the operation is simple and convenient, the reaction condition is mild, and the method is green and environment-friendly; acid is added into a reaction system, so that the lignin conversion rate and the aromatic aldehyde selectivity are effectively improved. The invention provides a new thought for efficient utilization of lignin, and also provides a feasible technical route for production of high-added-value chemicals.

The invention relates to the technical field of agricultural biology, in particular to a syringaldehyde-containing rubber seed three-stage isolate for treating atherosclerosis and application of the syringaldehyde-containing rubber seed three-stage isolate. An ultrasonic extraction technology is adopted to obtain a rubber seed crude extract with relatively high flavonoid content, a multistage preparation technology is adopted to separate a three-stage isolate of the rubber seed extract, an ApoE- / -mouse atherosclerosis model is established, and the influence of the three-stage isolate of the rubber seed containing syringaldehyde on ApoE- / -mouse atherosclerosis is further studied. It is determined that the three-stage rubber seed isolate is used for treating atherosclerosis, and safer and more effective plant extract functional food or novel medicine is expected to be obtained.

A chlorine detection test paper includes a carrier and a chlorine detection substance provided on the carrier, wherein the chlorine detection substance contain a color developer which includes one or more of DPD, tetramethylbenzidine, syringaldehyde azine, and vanillin azine.

The invention relates to a preparation method of camellia oleosa seed oil with high oxidation resistance, and belongs to the technical field of camellia oleosa seed oil. The preparation method comprises the following steps: mixing camellia seed powder with distilled water, carrying out ultrasonic treatment, preheating, adding immobilized compound enzyme, mixing, stirring at a constant temperature, and drying to obtain an intermediate; pressing the intermediate in a double-screw press; the preparation method of the immobilized compound enzyme comprises the following steps: preparing composite particles from chitosan, amino acid and cellulose, adding an auxiliary agent and an aromatic aldehyde solution to prepare a porous carrier, and immobilizing the compound enzyme by the porous carrier. According to the method, after the camellia seeds are subjected to ultrasonic treatment, compound enzyme can permeate into a plant tissue structure more easily, the extraction rate of grease is increased, in addition, chitosan, cellulose and amino acid are compounded to form a composite carrier, and the composite carrier and syringaldehyde form a Schiff base structure, so that the heat stability and pH tolerance of the immobilized enzyme are improved; the activity of the compound enzyme is improved and extraction of camellia oleosa seed oil is promoted.

The invention belongs to the technical field of medicines, and particularly relates to a construction method and an identification method of a UPLC specific chromatogram of a tetrapanax papyriferus standard decoction and a detection method of the content of chemical components. The construction method of the UPLC specific chromatogram of the tetrapanax papyriferus standard decoction comprises the following steps: taking a tetrapanax papyriferus reference medicinal material, and preparing a reference medicinal material reference solution; taking one or more of protocatechuic acid and syringaldehyde to prepare a reference solution; taking a tetrapanax papyriferus standard decoction, and preparing a test solution; and respectively carrying out ultra-high performance liquid chromatography detection on the reference substance solution of the reference medicinal material, the reference substance solution and the test solution, and constructing the UPLC characteristic spectrum of the tetrapanax papyriferus standard decoction. The method disclosed by the invention has the advantages of strong specificity, good repeatability, good stability and the like, the constructed UPLC characteristic spectrum has seven characteristic peaks, the spectrum information is rich, and a relatively comprehensive and effective evaluation method can be provided for quality control of the tetrapanax papyriferus standard decoction.

The invention belongs to the technical field of corrosion inhibition materials, and discloses a double-shell corrosion inhibition microsphere with a slow release effect as well as a preparation method and application of the double-shell corrosion inhibition microsphere. The method comprises the following steps: 1) taking ethanol as a reaction medium, and reacting methionine with syringaldehyde under the action of a basic catalyst to obtain a core material; (2) mixing melamine and formaldehyde, adjusting the pH value to 7-10, stirring at 60-80 DEG C for 3-10 minutes, adding water, and continuously reacting for 30-50 minutes to obtain a melamine-formaldehyde prepolymer; (3) uniformly mixing the melamine-formaldehyde prepolymer with an emulsifier, adjusting the pH value to 1-6, adding a solvent, a curing agent and a core material, and emulsifying for 30-50 minutes under an ice bath condition; and heating, stirring, continuing the reaction, and adjusting the pH value to be greater than or equal to 6 to obtain the double-shell corrosion inhibition microspheres. The method is simple, and the prepared microspheres are good in corrosion inhibition effect, stable in quality and good in mechanical performance. The microspheres provided by the invention are used for cosmetics, adhesives and coatings.

The invention provides a syringaldehyde glycosyl chromophore as well as a preparation method and application thereof, and belongs to the technical field of detection and analysis of inorganic mineral powder infiltrating fluid. The syringyl glycosyl chromophore disclosed by the invention is 3-((4-hydroxy-3, 5-dimethoxybenzylidene) amino)-4-((1-methoxy-1-oxo-3-phenylpropyl-2-yl) amino)-4-oxobutyric acid, and the structural formula of the syringyl glycosyl chromophore is shown in the specification. A structural formula of the syringaldehyde glycosyl color producing agent is shown as a formula I. The syringaldehyde glycosyl color producing agent can realize visual monitoring on a preparation process of an inorganic mineral powder infiltrating solution, and fills the blank that a traditional inorganic mineral infiltrating solution is difficult to detect in situ, in real time and efficiently.

The invention relates to the technical field of traditional Chinese medicine analysis, in particular to a method for determining the content of syringaldehyde in a sandalwood aqueous extract and a sandalwood identification method. The content of syringaldehyde in the sandalwood aqueous extract can be accurately, rapidly and conveniently determined by providing proper chromatographic conditions and determination methods, the identification method of the sandalwood aqueous extract is established based on the content difference of syringaldehyde in the sandalwood aqueous extract and counterfeit products, the adopted mobile phase A is acetonitrile, the adopted mobile phase B is acetonitrile, the adopted mobile phase C is acetonitrile, and the adopted mobile phase D is acetonitrile. The mobile phase B is an aqueous solution of phosphoric acid with the volume percentage of 0.08%-0.12%, isocratic elution is adopted, and the volume percentage of the mobile phase A is 6%-10%. The determination and identification method has good specificity and durability, the peak purity of syringaldehyde in an obtained chromatogram is high, the detection precision is high, and an important reference is provided for quality control and clinical medicine of the sandalwood aqueous extract.

The invention relates to the technical field of silicone rubber tackifiers, in particular to a bio-based tackifier, a silicone rubber composition and a preparation method of the silicone rubber composition. According to the technical scheme, the bio-based monomer serves as an initial raw material, dependence on traditional fossil resources is reduced, and the requirement for sustainable development can be met; a chain segment containing a plurality of ether groups is obtained through acetalation reaction of vanillin or syringaldehyde and pentaerythritol, has higher polarity and can form stronger intermolecular force with the surface of metal or engineering plastic. On the basis, vanillin or syringaldehyde and pentaerythritol acetalation reaction products are allylated and then subjected to hydrosilylation with a hydrogen-containing ring body or hydrogen-containing silane, so that the bio-based tackifier containing active Si-H bonds is obtained, the bio-based tackifier containing the active Si-H bonds contains a plurality of ether bonds, the subsequent hydrosilylation reaction cannot be interfered, and the viscosity of the bio-based tackifier is improved. And enough polarity can be provided, so that the interface bonding performance is improved.