Preparation method of polyurethane-polymethyl methacrylate block copolymer

The technology of polymethyl methacrylate and hydroxyl-terminated polymethyl methacrylate is applied in the field of preparation of polyurethane-polymethyl methacrylate block copolymer, and can solve the problems of large amount of catalyst and difficult removal, and the like, To achieve the effect of reducing air sensitivity

Inactive Publication Date: 2015-08-26
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It adopts the conventional ATRP method to prepare diblock copolymers, the amount of catalyst is large, and it is not easy to remove

Method used

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  • Preparation method of polyurethane-polymethyl methacrylate block copolymer
  • Preparation method of polyurethane-polymethyl methacrylate block copolymer
  • Preparation method of polyurethane-polymethyl methacrylate block copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of hydroxyl-terminated polymethyl methacrylate with molecular weight of 10000

[0021] In a 500mL four-neck flask equipped with a thermometer, add 100g of methyl methacrylate, 3.0253g of hydroxybutyl α-bromoisobutyrate (purity is 79%), CuBr 2 0.1117g, 0.8318g of pentamethyldiethylenetriamine, 3.0883g of stannous octoate, 50g of toluene, mechanically stir and mix evenly, bubbling for 5min to remove oxygen in the system, and continue bubbling reaction in an oil bath at 70°C After 3.5 hours, the conversion rate was 81%. The molecular weight M was measured by gel permeation chromatography (GPC) n =11440, molecular weight distribution PDI=1.23. In this reaction, the amount of the catalyst used is 500 ppm of the molar amount of the monomer, and a polymer with controllable molecular weight and narrow molecular weight distribution is obtained.

[0022] (2) Preparation of polyurethane-polymethyl methacrylate block copolymer

[0023] Take the polyurethane-poly...

Embodiment 2

[0027] (1) Preparation of hydroxyl-terminated polymethyl methacrylate with molecular weight of 8000

[0028] In a 500mL four-necked flask equipped with a thermometer, add 100g of methyl methacrylate, 3.3194g of hydroxybutyl α-bromoisobutyrate (purity is 90%), CuBr 2 0.1115g, 0.8654g of pentamethyldiethylenetriamine, 3.0346g of stannous octoate, 50g of anisole, mechanically stir and mix evenly, bubbling for 5min to remove the oxygen in the system, continue bubbling in an oil bath at 70°C After 3.5 hours of bubble reaction, the conversion rate was 86%. The molecular weight M was measured by gel permeation chromatography (GPC) n =7800, molecular weight distribution PDI=1.31. In this reaction, the amount of the catalyst used is 500 ppm of the molar amount of the monomer, and a polymer with controllable molecular weight and narrow molecular weight distribution is obtained.

[0029] (2) Preparation of polyurethane-polymethyl methacrylate block copolymer

[0030] Take the polyure...

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Abstract

The invention relates to a preparation method of a polyurethane-polymethyl methacrylate block copolymer. The preparation method comprises the following steps: preparing terminal hydroxyl polymethyl methacrylate; and preparing a block copolymer. The preparation method provided by the invention has the beneficial effects that (1) terminal hydroxyl polymethyl methacrylate is prepared by using an ARGET ATRP method, the structure, molecular weight and molecular weight distribution of the polymer can be controlled, and the concentration use level of the catalyst used in the reaction system is very low and can be reduced to dozens of ppm or even lower, and furthermore, the air sensitivity of the reaction system can be reduced, and a little amount of air can exist; and (2) terminal hydroxyl polymethyl methacrylate is prepared by using the ARGET ATRP method and reacts with diisocyanate, so that the novel polyurethane-polymethyl methacrylate block copolymer is obtained.

Description

technical field [0001] The invention belongs to the field of chemical materials and relates to a preparation method of polyurethane-polymethyl methacrylate block copolymer. Background technique [0002] Polymethylmethacrylate (Polymethylmethacrylate, referred to as PMMA, commonly known as plexiglass) is by far the resin with the best quality and reasonable price among synthetic transparent materials. PMMA resin is a non-toxic and environmentally friendly material, and it is not easy to produce sharp fragments when broken. However, due to the characteristics of low surface hardness, low impact resistance, and poor molding fluidity of PMMA resin, the modification of PMMA has appeared one after another. For example, the copolymerization of methyl methacrylate with styrene and butadiene, the copolymerization of PMMA and PC, etc. [0003] Polyurethane (PU for short) is an important polymer material made by the reaction of polyisocyanate, polyol, and organic small molecule polyo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/62C08G18/65C08G18/66C08G18/48C08F120/14
CPCC08F120/14C08F120/18C08F120/44C08F293/005C08G18/0823C08G18/348C08G18/4063C08G18/48C08G18/4812C08G18/6225C08G18/6245C08G18/6262C08G18/633C08G18/638C08G18/6511C08G18/6607C08G18/6692C08G18/7621
Inventor 贾正白雪张筱瑾孙仪琳李坚任强汪称意
Owner CHANGZHOU UNIV
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