47results about How to "Achieve copolymerization" patented technology

The invention discloses an activity-controllable catalysis system for catalyzing inner ester ring opening polymerization, and belongs to the technical field of macromolecular synthesis. Inner ester serving as a monomer raw material is subjected to ring opening polymerization under the synergetic catalysis of Lewis acid and Lewis alkali under a condition of no use of a solvent or use of an organic solvent. The activity-controllable catalysis system has the advantages of readily available raw material, convenience for operation, mild reaction condition, quickness, high conversion rate and the like; furthermore, the use amount of a catalyst is small; the molecular weight of an obtained polymer is controllable, and the molecular weight distribution is narrow; the activity-controllable catalysis system realizes activity-controllable polymerization, and can realize copolymerization among different inner esters.

The invention provides an application and a usage of vanadium series catalyst of one-class bidentate N, O coordination. From the angle of preventing functional monomer from poisoning catalyst, the invention selects the vanadium series olefinic polymerization catalyst of one-class bidentate N, O coordination to realize the copolymerization of ethylene and polar monomer under the action of cocatalyst and promoter after different protecting agents pretreat the polar monomer. Through adjusting copolymerization conditions, the invention obtains a series of functional polyolefine with controllable comonomer insertion rate and molecular weight. Especially, the invention realizes the copolymerization between ethylene and 10-hendecene-1-alcohol, between ethylene and 5-hexene-1-alcohol, between ethylene and 3-butylene-1-alcohol or between ethylene and 10-methyl undecylenate.

The invention discloses a preparation method of a lignin-modified environmental-friendly urea-formaldehyde resin adhesive, which comprises the following steps: (1) dissolving lignosulfonate to obtain a lignin solution, and then adding biological enzymes into the lignin solution Combined with the mediator to depolymerize lignin to obtain a depolymerized lignin solution; (2) adjust the depolymerized lignin solution to be weakly alkaline, and add a silane coupling agent for grafting reaction to obtain a lignin modified solution; (3 ) Adding formaldehyde and urea to the lignin modification solution to react to obtain the lignin modified environmental-friendly urea-formaldehyde resin adhesive. The preparation method of the lignin-modified environment-friendly urea-formaldehyde resin adhesive of the present invention has mild reaction conditions, is environmentally friendly, does not produce pollutants, and grafts and modifies its ash to realize the copolymerization of lignin and ash particles with urea-formaldehyde resin and reduce urea-formaldehyde The amount of formaldehyde used in the resin synthesis process solves the problems of high formaldehyde release and poor environmental protection of urea-formaldehyde resin adhesives.

Belonging to the technical field of polymer synthesis, the invention relates to a frustrated Lewis pair FLP catalyzed vinyl polar monomer living polymerization method. A vinyl polar monomer is adoptedas the monomer raw material for conjugate addition polymerization under the synergic catalysis of a frustrated Lewis pair, in terms of mole, Lewis acid is greater than Lewis base and smaller than themonomer, and the ratio of the monomer to the Lewis base is 20-3200:1, the reaction temperature is room temperature, and the reaction time is 30sec-24h. The method provided by the invention has the characteristics of easily available raw materials, convenient operation, mild reaction conditions, rapidity, high conversion rate, wide monomer adaptability and the like, also the catalyst dosage is small, and the initiation efficiency is close to 100%, therefore the method is living controlled polymerization, and can realize random copolymerization and block copolymerization between different polarmonomers.

The invention provides a high-permeability permeable concrete cement. The main raw materials include magnesium phosphate cement, polyorganosiloxane, epoxy resin, phenolic resin, hydroxypropyl acrylate, acrylamide, cellulose ether, and active silica powder, bone cement powder, gelatin, polyvinyl alcohol, pentaerythritol, calcium sulfoaluminate hydrate, calcium carbonate whiskers, sodium dodecylbenzenesulfonate, zinc 2,4-pentadienoate, coupling agent, Defoamer and water, etc., have excellent bonding effect, meet the strength requirements of the road surface, and can meet the water permeability requirements of high-permeability permeable concrete.

The invention relates to fluorine-containing syndiotactic polystyrene and a preparation method thereof, belongs to the technical field of preparation of polymers and solves the technical problems of extremely low polymerization rate and transformation rate of current fluorine-containing polystyrene in coordination polymerization. The fluorine-containing syndiotactic polystyrene comprises a repetition unit with a structure expressed as formula (I) and a repetition unit with a structure expressed as formula (II). The formula (I) and the formula (II) are shown in the description. Experimental results show that the syndiotactic selectivity of the fluorine-containing syndiotactic polystyrene is not less than 90%; the content of structure units of the fluorine-containing styrene can be randomly adjusted between 0 and 100%. The preparation method of the fluorine-containing syndiotactic polystyrene firstly achieves high-activity, high-transformation-rate and high-selectivity coordination polymerization of the fluorine-containing styrene for the first time, achieves copolymerization of the fluorine-containing styrene and styrene under any monomer ratio for the first time, enables the insertion rate of the fluorine-containing styrene to be freely regulated and controlled, and breaks through the limitation that the conventional fluorine-containing styrene is low in possibility of coordination polymerization; through the method, the complete transformation of the monomers can be achieved.

The present invention relates to a vinyl chloride-based copolymer, a preparation method thereof, a composition comprising the same, and a resin article made from the composition. This vinyl chloride-based copolymer includes a structural unit (a) based on vinyl chloride, a structural unit (b) based on a monomer represented by the following formula (1) and a structure based on a monomer represented by the following formula (2) Unit (c), CH 2 =CR 1 COO(R 2 O) x R 3 (1) In formula (1), R 1 selected from hydrogen and straight-chain or branched-chain alkyl groups with 1 to 6 carbons; the number of repeating units x is an integer selected from 2 to 20, and each R 2 Selected from linear or branched alkylene groups with carbon numbers of 2 to 10, which may be the same or different; R 3 Selected from hydrogen and straight-chain or branched-chain alkyl groups with 1 to 4 carbons, CH 2 = CHOR 4 (2) In formula (2), R 4 A straight chain or branched chain alkyl group with 1 to 10 carbons, a straight chain or branched cycloalkyl group with 3 to 10 carbons, and a straight chain or branched chain with 1 to 10 carbons hydroxyalkyl groups.

The invention provides an active polymerization system based on synthesis of ultrahigh molecular weight polymer catalyzed by phosphine alkali, which belongs to the technical field of polymer synthesis. In an organic solvent, a vinyl polar monomer is used as a monomer raw material, and conjugate addition polymerization is performed under synergic catalysis of Lewis acid and Lewis base, wherein theLewis base is a phosphine compound. The active polymerization system based on synthesis of ultrahigh molecular weight polymer catalyzed by phosphine alkali has the advantages of easy raw material obtaining, convenient operation, mild reaction conditions, high speed, high conversion rate, wide monomer adaptability, small catalyst usage amount, controllable molecular weight of polymers, narrow molecular weight distribution, and activity-controlled polymerization, and copolymerization between monomers of different polarities can be realized.

The invention discloses a method for synthesizing clustered peptides catalyzed by a rare earth catalyst. In the method, rare earth borohydride, alkoxy rare earth or aryloxy rare earth are used as catalysts to catalyze N-substituted glycine-N-carboxylic acid anhydride and N-substituted glycine - Ring-opening polymerization of N-thiocarboxylic acid anhydride, reacting at a temperature of 0°C to 100°C for 12 hours to 4 days to prepare high molecular weight clustered peptides. The catalyst used in the invention is cheap and easy to prepare, has high catalytic activity, and the prepared polymerized peptide has a high molecular weight of up to 70,000, a high degree of polymerization of up to 1000, and a narrow molecular weight distribution of less than 1.4.