69results about How to "Polymerization reaction conditions are mild" patented technology

The invention discloses a preparation method of polyene ether compounds. The method includes: organic small-molecule 4-dimethylamino pyridine (DMAP) is used as the catalyst, binary alkynyl compounds and binary hydroxy compounds are mixed with organic solvent, and the polyene ether compounds are obtained by using the click polymerization reaction of alkynyl-hydroxy. The polyene ether compounds comprise an inner unit indicated by formula (I). The polymerization step is showed in the formula (V), wherein n is larger than 1, and R1 and R2 are selected from organic groups. The method has the advantages that water and oxygen do not need to be removed during reaction, polymerization temperature is low, polymerization efficiency is high, and no metal residues exist in products; the prepared polyene ether compounds are high in steric regularity, good in machinability, and high in heat stability, degradability and aggregation-induced emission performance.

The invention provides a formula and a preparation method of a cationic polymer. The raw material formula of the cationic polymer comprises the following components in part by weight: water 5-50, acetone 3-25, amine 5-30, aldehyde 5-40, alkaline regulator 3-12 and acidic regulator 5-20. In the method, a water soluble cationic polymer is prepared from aldehyde, acetone and amine by a nucleophilic addition reaction, an aldol condensation reaction and a Michael addition reaction in the presence of acid and alkali catalysts in turn and by a two-step feeding process. The method has the advantages that: the raw material cost is low, the synthesis process is simple and easy to implement; the preparation conditions are mild and safe; and the obtained product has high cation content and has high decolorizing and flocculating effects on anionic dye waste water.

The invention relates to the thermoplastic elastomer technology, aims to provide multi-block branched polyethylene and a preparation method thereof and further provides an application of polyethylene. The multi-block branched polyethylene is formed by alternately connecting semi-crystalline low-branching-degree polyethylene chain segment used as a hard segment and an amorphous high-branching-degree polyethylene chain segment used as a soft segment in a soft segment-hard segment-soft segment-hard segment connection manner. During preparation, only vinyl monomer is used as a raw material, and the production cost is low; only one catalyst is needed, the matching problem of two catalysts is not required to be considered, the production process is greatly simplified, and the method is suitable for mass industrial production. A chain shuttle reaction is performed between two identical metal activity centers in molecules, the advantages of high efficiency and quickness are realized, the chain structure and composition of a polymerized product are uniform, the polymerization reaction adopts mild condition and is not required to be performed at the high temperature, and energy consumption is substantially reduced.

The invention discloses a one-step synthetic method of degradable branched polyester, and belongs to the technical field of polymer synthesis. According to the method, a reactive monomer comprises internal ester, anhydride, cyclic carbonate and the like; a self-initiated monomer comprises acrylic acid hydroxy ester and a methacrylic acid hydroxy ester compound, and a catalyst is a phosphine nitrile alkali compound structurally containing a double bond in which P is equal to N. The one-step synthetic method has the advantages that all raw materials for the polymerization reaction are commercialized and the conditions of the polymerization reaction are mild, is suitable for industrialized production, has an excellent application prospect, and is mainly used for the technical field of the polymer synthesis.

The invention discloses an agricultural microbial agent microcapsule based on cell membrane mimicking and a preparation method thereof. The effect of regulating the osmotic pressure of cells is realized by regulating the moisture content of microbial cells and the flux of oxygen; and the wall material of the microcapsule is selected from gamma-polyglutamic acid (gamma-PGA), a polysaccharide material and dopamine. The gamma-PGA can achieve a synergistic effect with a microbial agent so as to enhance the antioxidant ability of plants, alleviate damage to plants under abiotic stress and promote plant growth, and is a typical microorganism-derived biostimulant; and a compact film formed by auto-polymerization of the dopamine on the surfaces of bacteria can effectively relieve the influence ofexternal osmotic pressure on the bacteria in the microcapsule, and polymerization reaction conditions are mild and have small damage to the bacteria. The preparation method disclosed by the inventionis based on a cell surface polymerization technology, and can realize single-cell coating of the microbial agent and inhibit proliferation of the microbial agent.

The present invention discloses a polyimidazole compound, an in-situ preparation method and applications thereof, wherein a binary isocyano compound is subjected to a cyclization polymerization reaction in an organic solvent under the action of a cyclization polymerization catalyst to obtain the polyimidazole compound. According to the present invention, the imidazole unit in the prepared polyimidazole compound is formed by carrying out in-situ polymerization on the imidazole-unit-free monomer so as to make up the gaps in the prior art; the cyclization polymerization reaction is the one-component polymerization reaction, the monomer ratio is not required to be considered, the process is simple, the reaction raw materials and the catalyst are easy to obtain, the polymerization reaction conditions are mild, the polymerization can be performed at the room temperature, and the energy source is saved; and the polymerization efficiency of the polymerization reaction is high, the high molecular weight polymer can be obtained after the reaction is performed for a short time, the polymerization reaction has excellent region selectivity and excellent stereoselectivity, no by-product is generated during the polymerization process, and the atom economy is met.

The invention relates to a preparation method of cage type n-propyl oligomeric silsesquioxane. N-propyl triethoxy silane or n-propyl trimethoxy silane is utilized as a raw material and alcohol serves as a solvent. The method includes performing hydrolytic condensation reaction under catalysis of concentrated hydrochloric acid of 36-38 wt% to prepare the cage type n-propyl oligomeric silsesquioxane with 8 n-propyls. The preparation method is convenient to operate, the raw material is easy to obtain, the polymerization reaction is mild in reaction condition and easy to control, and the product is high in yield, low in cost and small in pollution.

The invention relates to the field of organic polymer chemistry, and specifically relates to a siloxane copolymer containing ethyl phenyl silica chain links and a preparation method thereof. The preparation method comprises the following steps: taking ethyl phenyl dialkoxysilane and dimethyl dialkoxysilane as the raw materials, carrying out hydrolysis condensation reactions in the presence of an anionic type or cationic type hydrolysis catalyst to generate oligomer composed of ethyl phenyl silica chain links and dimethyl silica chain links, then mixing the obtained oligomer with end-capping reagents with different structural types, carrying out reactions in the presence of an anionic type or cationic type polymerization catalyst, and subjecting the reaction products to neutralization/catalyst decomposition and reduced pressured distillation to remove low-boiling-point substances so as to obtain poly(dimethyl-ethylphenyl)siloxane copolymer with ends capped by different functional groups. The species of the monomer used in the provided method are few, the polymerization reaction conditions are mild, the reaction process control is simple, the copolymer structure is uniform, and the performance of the copolymer is excellent, and the provided method is suitable for massive industrial production.

The present invention discloses a temperature-resistant and salt-resistant polymer oil displacement agent and a preparation method thereof, wherein the temperature-resistant and salt-resistant polymer oil displacement agent is formed by polymerizing acrylamide, allyl polyethylene glycol, sodium p-styrene sulfonate, and dimethyl allyl octadecylammonium chloride according to a molar ratio of (94-97):(1.7-4.7):(0.3-1.0):(0.3-1.0). According to the present invention, the polymer oil displacement agent can maintain good tackifying effect at a high temperature in a salt solution having a certain concentration, and has characteristics of good temperature resistance, good salt resistance, good shear resistance, low raw material monomer cost, mild polymerization reaction condition, and simple process.

The invention relates to an ultra-high molecular weight poly(4-alkoxystyrene) and a preparation method thereof. The ultra-high molecular weight poly(4-alkoxystyrene) is of a structure as shown in a formula (I), wherein R is methyl or ethyl; and the weight-average molecular weight is not less than 1 million. The provided ultra-high molecular weight poly(4-alkoxystyrene) has the weight-average molecular weight of not less than 1 million, and better mechanical properties, thermal stability, and hydrophilic properties are realized comparing with commercial polystyrene .

The invention provides a norbornene imide heat-resistant polymer porous material and its preparation method. The method comprises the following steps: Step 1, a norbornene imide monomeric compound is prepared from norbornene anhydride and a multi-element organic amine compound by a one-step method or a two-step method, and the norbornene imide monomeric compound is purified; Step 2, the purified product obtained from the step 1 is dissolved in an organic solvent b, temperature is maintained at minus 10-100 DEG C, a Grubbs catalyst is added to carry out a polymerization reaction at the reaction temperature of minus 10-120 DEG C for 5 minutes-2 weeks; and Step 3, aftertreatment is carried out to obtain the heat-resistant polymer porous material.

The invention discloses a polyquinazoline compound as well as a preparation method and application thereof. The preparation method comprises the following step: carrying out multi-component polymerization reaction on normal-pressure carbon dioxide, bifunctional isonitrile and bifunctional o-iodobenzidine monomer under the action of a catalyst and alkali to obtain the polyquinazoline compound. Themethod is mild in condition, and the polymerization monomer is simple and easy to obtain. The polyquinazoline compound obtained by the invention has good solubility, processability and high thermal stability, and has potential application in the fields of metal ion detection and self-assembly.

The invention relates to the technical field of oilfield water injection, and discloses an acrylamide copolymer, a preparation method and applications thereof. The preparation method comprises: underthe condition of a solution polymerization reaction, in the presence of an initiator and a surfactant, carrying out a polymerization reaction on acrylamide and a monomer mixture comprising a comonomerwith a structure represented by a formula (1) and an active monomer with a structure represented by a formula (2) in water, wherein the initiator comprises an initiator A with a structure representedby a formula (3) and an initiator B, the initiator B is 4-methylthiosemicarbazide, R1-R3 and R5 are respectively selected from hydrogen and C1-C4 alkyl, R4 is C1-C4 alkylene, M is hydrogen, sodium orpotassium, R6-R9 are respectively C1-C4 alkyl, n is an integer of 1-10, and m is an integer of 2-6. According to the invention, the prepared acrylamide copolymer has advantages of ultrahigh molecularweight tackifying property, excellent solubility, excellent temperature resistance, excellent salt resistance and favorable surface/interface activity.

The invention discloses a sulfamide polymer and a preparation method thereof, and relates to the technical field of polymer synthesis. The sulfamide polymer has a structural formula as shown in a general formula (I), wherein R1 and R2 are organic groups, and n is the degree of polymerization and is an integer between 2 and 50. The preparation method comprises the following steps: carrying out polymerization reaction on a binary sulfonyl azido compound and a binary arylboronic acid compound in an organic solvent, and carrying out precipitation separation on the product through diethyl ether to obtain the sulfamide polymer, wherein any alkali, ligand or additive is not needed. The method has the advantages of mild reaction conditions, simple reaction post-treatment, cheap and low-toxicity catalyst, easy substrate modification and the like.

The invention relates to a novel binuclear xanthene bridging amino-pyridine nickel catalyst and a preparation method thereof. The novel binuclear xanthene bridging amino-pyridine nickel catalyst is used for catalyzing ethylene polymerization to prepare polyethylene which is low in polymerization degree and high in branching degree. The binuclear nickel catalyst has the advantages that the catalystis high in thermal stability and catalytic activity and capable of effectively regulating the molecular weight and branching degree of polyethylene, and the prepared polyethylene which is low in polymerization degree and high in branching degree can be used as a diesel oil pour point depressant and can effectively lower the condensation point and cold filter plugging point of diesel oil.

The invention discloses a polyacetylene amide compound as well as a preparation method and application thereof. The preparation method comprises the following steps that: under the inert gas atmosphere, water, a bifunctional terminal alkyne monomer and a bifunctional isonitrile monomer are subjected to a polymerization reaction in an organic solvent under the combined action of a catalyst and a ligand, and after the reaction is finished, the product is purified and dried to obtain the polyacetylene amide compound. The method is mild in condition, and the polymerization monomer is simple and easy to obtain. The polyacetylene amide compound obtained by the method has relatively good solubility and relatively high thermal stability, and has potential application in the field of self-assembly.