14 results about "Polymer yield" patented technology

The invention relates to the technical field of microbial fermentation and food processing, and particularly discloses Weissella fusiformis JMF-006 as well as a mutagenesis method and application thereof. The invention provides a Weissella fusiformis JMF-006 with the exopolysaccharide yield of 20-25g / L. The Weissella fusiformis JMF-006 is obtained by breeding through a mutation breeding method of a high-yield EPS strain, and the mutation breeding method can also be used for culturing other high-yield EPS strains. The invention provides a strain composition, the strain composition comprises Weissella fusiformis JMF-006 or a high-yield EPS strain, other lactic acid bacteria strains (such as lactobacillus plantarum JMF-001 and lactobacillus casei JMF-002) can be further compounded, and the obtained strain composition has more excellent fermentation performance. When the Weissella fusiformis JMF-006, the high-yield EPS strain and the strain composition provided by the invention are applied to the fermentation process of food-derived drinks, a fermented product with stable properties and better flavor can be obtained, and the technical problems that the yield of extracellular polymeric substances is low, the fermentation performance is poor and the application range is narrow in an existing lactic acid bacteria starter are solved.

The invention relates to the field of fine chemical engineering and polymeric material synthesis, in particular to an organic phosphine ligand and a preparation method thereof, a catalyst composition and a preparation method of polyketone, and particularly provides the organic phosphine ligand with the structure shown in the formula (I). The obtained catalyst is stable in chemical property and high in catalytic activity, can be used for production and preparation of polyketone, and has relatively high polymerization reaction rate and relatively high polymer yield.

Methods include producing tunable carbon structures and combining carbon structures with a polymer to form a composite material. Carbon structures include crinkled graphene. Methods also include functionalizing the carbon structures, either in-situ, within the plasma reactor, or in a liquid collection facility. The plasma reactor has a first control for tuning the specific surface area (SSA) of the resulting tuned carbon structures as well as a second, independent control for tuning the SSA of the tuned carbon structures. The composite materials that result from mixing the tuned carbon structures with a polymer results in composite materials that exhibit exceptional favorable mechanical and / or other properties. Mechanisms that operate between the carbon structures and the polymer yield composite materials that exhibit these exceptional mechanical properties are also examined.

The invention belongs to the technical field of olefin polymerization, and particularly relates to a method for continuous polymerization of ethylene and alpha-olefin. According to the method, the feeding temperature of the raw materials is 10-30 DEG C; the temperature of the polymerization reaction is 120-150 DEG C; the ratio of the raw material heat removal amount to the polymerization reaction heat exchange amount is Q, and Q is more than 50% and less than 85%; ; xc is the mass ratio of the structural unit from the alpha-olefin monomer in the polymer, Tr is the temperature value of the polymerization reaction by taking DEG C as the unit, Ta is the feeding temperature value of the raw material by taking DEG C as the unit, and W is the reaction solid content; w = yield of polymer / total feed quantity * 100%; the total feed quantity comprises the feed quantity of the raw material, the main catalyst and the cocatalyst; the method is low in energy consumption and high in polymerization activity, the obtained polymer is good in fluidity, equipment cannot be blocked, long-term operation of the equipment is facilitated, and the cost is reduced.

The present invention relates to a process for processing an absorbable slowly crystalline poly (p-dioxanone) milled resin and its fines using a twin screw extruder apparatus to produce uniform pellets. Advantageously, the ground resin material resulting from solid state polymerization is not subjected to processing (such as screening) to remove fines from the feedstock used in an extrusion and granulation system that has been configured with a reverse temperature profile along the extrusion cartridge. The resulting PDS pellets have improved resin uniformity and greater polymer yields, thereby improving operational efficiency and the production of extruded filaments.

The invention discloses polynorbornene imide for winding insulation as well as a preparation method and application of the polynorbornene imide, and belongs to the technical field of electrical insulation materials and preparation of the electrical insulation materials. The invention solves the problem of low polymerization degree of the existing polynorbornene imide. Compared with a traditional DCM solvent, the binary solvent system composed of DMF and ethyl acetate is used for preparing polynorbornene imide, the polymerization effect is obviously improved, and the polymer yield is as high as 17.3%. Compared with the polynorbornene, the polynorbornene imide film prepared by the preparation method has the advantages that an imide group is introduced, and the imide group has a relatively strong electron attraction effect, so that the electrophilic property of the polynorbornene is enhanced, and the breakdown field strength of the polynorbornene imide can reach 500MV / m. The preparation process provided by the invention is simple, feasible, pollution-free, low in required equipment cost and suitable for large-scale production, has important scientific research value, and also has huge application potential and market prospect.

The present invention discloses a method for polymerizing a polystyrene derivative, belonging to the technical field of polymers and their preparation; Pd(II) ((L1)Pd(OAc) 2 ) is used as the metal center, combined with the Brookhart diamine ligand, namely ligand L1, and polymerization is carried out in the presence of trifluoroacetic acid; in the Pd(II) system, the presence of hydroquinone is beneficial to the progress of the polymerization reaction, improving the polymer yield, and in the Pd(II) system, by adjusting the coordination environment of the metal, Pd(II) acts as a Lewis acid to promote the cationic polymerization initiated by trifluoroacetic acid. The polymerization method of the present invention has the advantages of simple synthesis, weak sensitivity to air and water, high yield, high catalytic activity for olefin polymerization, low oxygen affinity and high tolerance to polar monomers.

In this invention synthetic bottlebrush and comb-like (multi) block polymers (copolymers) can be formulated to form on demand non leachable bottlebrush elastomers with tunable curing time as well as adjustable mechanical and optical properties. The disclosed formulations can be injected directly into the tissue followed up by curing at the physiological conditions. The curing process can be designed with and without using catalysts, initiators, and external stimuli. The cured polymer yield supersoft elastomer with tissue-mimetic mechanical properties.

Polymeric substrates, optionally in sheet form, treated with a thin layer of photoresist are perforated by laser ablation. Following removal of the photoresist the polymer substrates perforated with holes are patterned in stripes by photolithography, which is followed by synthesis of a cell-adhesive organometallic / self-assembled monolayer of phosphonate (SAMP) interface in the exposed regions, providing well-aligned continuous stripes for various levels of perforation. Cells plated on each of these 2-dimensional (2D) perforated surfaces attach to the interface and spread in alignment with pattern fidelity that is as high as that measured on a non-perforated, patterned substrate. A stack of such 2D patterned polymers yields a 3-dimensional (3D) device which facilitates cell growth and viability via the perforations.

The application belongs to the technical field of olefin polymerization, and particularly relates to a method for continuous polymerization of ethylene and alpha-olefin. The feeding temperature of raw materials of the method is 10-30 DEG C; the temperature of polymerization reaction is 120-150 DEG C; the ratio of raw material heat removal amount to polymerization reaction heat exchange amount is Q, 50% < Q < 85%; Xc is the mass proportion of structural units from alpha-olefin monomers in the polymer, Tr is the temperature value of polymerization reaction in units of DEG C, Ta is the feeding temperature value of raw materials in units of DEG C, and W is the reaction solid content; W = polymer yield / total feeding amount * 100%; the total feeding amount includes the feeding amounts of raw materials, main catalysts and auxiliary catalysts. The method has low energy consumption, high polymerization activity, good flowability of the obtained polymer, no blocking of equipment, and is beneficial to long-term operation of the equipment and reduction of cost.

The invention discloses a polyacetylenic ketone compound and a preparation method and application thereof, and the preparation method comprises the following steps: (1) in a CO2 atmosphere, CO2 and a reducing agent react in an organic solvent to obtain a mixed solution; and (2) adding a bifunctional terminal alkyne monomer, a bifunctional aryl iodine monomer, a catalyst and alkali into the mixed solution obtained in the step (1), and carrying out multi-component polymerization reaction to obtain the polyacetylenic ketone compound. The preparation method is mild in condition, the polymerization monomer is simple and easy to obtain, and the polymer yield is high. The polyacetylenic ketone compound obtained by the invention has better solubility, thermal stability, processability and fluorescence property, and has potential application in the field of metal ion detection.

Methods include producing tunable carbon structures and combining carbon structures with a polymer to form a composite material. Carbon structures include crinkled graphene. Methods also include functionalizing the carbon structures, either in-situ, within the plasma reactor, or in a liquid collection facility. The plasma reactor has a first control for tuning the specific surface area (SSA) of the resulting tuned carbon structures as well as a second, independent control for tuning the SSA of the tuned carbon structures. The composite materials that result from mixing the tuned carbon structures with a polymer results in composite materials that exhibit exceptional favorable mechanical and / or other properties. Mechanisms that operate between the carbon structures and the polymer yield composite materials that exhibit these exceptional mechanical properties are also examined.

An improved method for forming and employing wax to modify polymer yield and melt flow. The method includes: (a) selecting a solid polymer material; (b) heating the solid polymer material in an extruder to produce a molten polymer material; (c) filtering the molten polymer material; (d) placing the molten polymer material in a reactor via a chemical depolymerization process to produce a depolymerized polymer material; and (e) adding the depolymerized material to a prewax mixture to produce a modified polymer.

The present invention is directed to methods for processing absorbable, slow-to-crystallize poly(p-dioxanone) ground resin and its fines utilizing a twin-screw extruder apparatus to produce uniform pellets. Advantageously, the ground resin materials resulting from solid-state polymerization do not undergo processing, such as sieving, to remove fines from the feedstock for an extrusion and pelletizing system that has been configured with an inverted temperature profile along the extrusion barrel. The resulting PDS pellets have improved resin uniformity and greater polymer yield for improved operational efficiencies and production of extruded filaments.