Segmented copolymer flexibilizer as well as preparation method and application thereof

A block copolymer and toughening agent technology, which is applied in the field of block copolymer toughening agent and its preparation, can solve the problems of restricting the synthesis of block polymers, and achieve the controllable and well-controlled molecular weight of the system and the large molecular weight of the product Effect

Active Publication Date: 2015-09-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the final PMMA latex system produced up to 6% agglomeration, which limited the synthesis of subsequent block polymers.

Method used

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  • Segmented copolymer flexibilizer as well as preparation method and application thereof
  • Segmented copolymer flexibilizer as well as preparation method and application thereof
  • Segmented copolymer flexibilizer as well as preparation method and application thereof

Examples

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preparation example Construction

[0038] The preparation method of the reversible addition-fragmentation chain transfer emulsion polymerization of the block copolymer toughening agent of the present invention comprises the following steps:

[0039] (1): 1.7-3.0 parts by weight of amphiphilic macromolecular reversible addition fragmentation chain transfer reagent is stirred and dissolved in 50-200 parts by weight of water to form a water phase, and then mixed with an oil phase composed of 6.7-33.4 parts by weight of MMA Add together to the reactor and stir to mix. Raise the temperature of the reactor to 60-80°C, keep stirring, pass nitrogen to remove oxygen for more than 5 minutes, add 0.02-0.03 parts by weight of water-soluble initiator, and react for 1-2 hours to obtain X-MAA n1 -b-MMA n2 -b-MMA n3 - R polymer, which is stably dispersed in water in the form of particles to form a latex;

[0040] (2): Add 0-172 parts by weight of water and 15.7-86 parts by weight of nBA monomer, the reaction temperature is ...

Embodiment 1

[0064] The first step: 2.6 parts by weight of the amphiphilic macromolecular reversible addition fragmentation chain transfer reagent (1) is dissolved in 100 parts by weight of water with heating and stirring to form a water phase, and then added together with the oil phase composed of 12.8 parts by weight of MMA Stir to mix in the reactor. Raise the temperature of the reactor to 80°C, keep stirring, add 0.02 parts by weight of water-soluble initiator potassium persulfate after 30 minutes of nitrogen gas, and react for 1 hour to obtain X-MAA n1 -b-MMA n2 -b-MMA n3 -R polymer latex.

[0065] The second step: After the first step of the reaction, add 26.6 parts by weight of water and 32.7 parts by weight of nBA monomer, the reaction temperature is 70 ° C, and X-MAA is obtained after 1 hour of reaction n1 -b-MMA n2 -b-MMA n3 -b-nBA n4 -R block copolymer latex.

[0066] like figure 1 As shown, the molecular weight of each block increases gradually during the polymerization...

Embodiment 2

[0068]The first step: 3 parts by weight of the amphiphilic macromolecular reversible addition fragmentation chain transfer reagent (1) is heated and stirred and dissolved in 100 parts by weight of water to form a water phase, and then added together with an oil phase composed of 17 parts by weight of MMA Stir to mix in the reactor. Raise the temperature of the reactor to 80°C, keep stirring, and add 0.03 parts by weight of water-soluble initiator ammonium persulfate after passing nitrogen for 30 minutes, and react for 1 hour to obtain X-MAA n1 -b-MMA n2 -b-MMA n3 -R polymer latex.

[0069] The second step: After the first step of the reaction, add 96 parts by weight of water and quickly add 64 parts by weight of nBA monomer, the reaction temperature is 70 ° C, and X-MAA is obtained after 1 hour of reaction n1 -b-MMA n2 -b-MMA n3 -b-nBA n4 -R block copolymer latex.

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Abstract

The invention discloses a segmented copolymer flexibilizer as well as a preparation method and application thereof. According to the preparation method disclosed by the invention, poly(methacrylic acid-b-methyl methacrylate-b-n-butyl acrylate) segmented copolymer flexibilizers with different monomer compositions and different molecular weights are prepared by using an emulsion polymerization system and a reversible addition fragmentation chain transfer free radical polymerization technology. The segmented copolymer flexibilizer is blended with polycarbonate to prepare an alloy. The process of the preparation method disclosed by the invention is simple in equipment, environment-friendly, energy-saving and easy to operate. The segmented copolymer flexibilizer is prepared by using an amphiphilic macromolecular reversible addition fragmentation chain transfer reagent, has the double functions of a chain transfer reagent and an emulsifier, realizes good control on monomer polymerization, and avoids the use of the traditional emulsifier; the reaction has no polymerization inhibition period, and has a high reaction speed and a high final conversion rate, colloidal particle growth during the process is stable, and the molecular weight range of the product is wide.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a block copolymer toughening agent, its preparation method and application. Background technique [0002] Polycarbonate (Polycarbonate, PC) is an amorphous thermoplastic engineering plastic with excellent comprehensive properties. It has outstanding impact resistance, good dimensional stability, and excellent dielectric properties. Esters are the most important products. However, unmodified polycarbonate still has deficiencies. The main performance defects are notch sensitivity, insufficient processing fluidity, poor stress cracking resistance and poor resistance to organic solvents. [0003] In order to improve the notched impact performance of polycarbonate, thermoplastic elastomer polystyrene-b-polybutadiene-b-polystyrene triblock copolymer (SBS), acrylonitrile-styrene-butadiene copolymer ( ABS), core-shell structure methyl methacrylate-butadiene-styren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F220/14C08F220/18C08F2/38C08L53/00C08L69/00
Inventor 朱月高翔罗英武
Owner ZHEJIANG UNIV
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