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A kind of multi-block copolymer of narrow molecular weight distribution and preparation method thereof

A technology of multi-block copolymer and narrow molecular weight distribution, which is applied in the field of multi-block copolymer with narrow molecular weight distribution and its preparation, can solve the problem of long-chain branching, uncontrollable polymer molecular structure, and conversion rate of only 90%. To achieve high molecular weight, easy industrialization and continuous production, and wide application range of monomers

Active Publication Date: 2020-04-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, gradient copolymers with a similar nine-block structure have also been successfully prepared by RFAT emulsion polymerization, but the conversion rate of each block is only about 90%.
However, the same method has the problem of long-chain branching when synthesizing acrylate monomers and diene monomers. The PDI of the final product is as high as 3 or more, and the molecular structure of the polymer is uncontrollable.

Method used

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  • A kind of multi-block copolymer of narrow molecular weight distribution and preparation method thereof
  • A kind of multi-block copolymer of narrow molecular weight distribution and preparation method thereof
  • A kind of multi-block copolymer of narrow molecular weight distribution and preparation method thereof

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preparation example Construction

[0031] The present invention provides a multi-block copolymer with narrow molecular weight distribution prepared by reversible addition-fragmentation chain transfer emulsion polymerization and a preparation method thereof, comprising the following steps:

[0032] (1) 0.6-3 parts by weight of amphiphilic macromolecular reversible addition-fragmentation chain transfer reagent is stirred and dissolved in 20-50 parts by weight of water, followed by adding 5-15 parts by weight of M 1 The monomer is stirred and pre-emulsified and then added to the reactor; the reactor is heated to 30-80° C., kept stirring, and nitrogen and oxygen removed for more than 30 minutes; 0.001-0.05 parts by weight of the initiator is added to the reaction system; Reaction 1 After ~5 hours, add 5-10 parts by weight of sodium hydroxide aqueous solution, which contains 0.05-0.2 parts by weight of sodium hydroxide, and continue to react for 0.2-0.5 hours to obtain R-X m1 -b-Y m2 -b-(M 1 ) n1 -T block copolym...

Embodiment 1

[0056] The first step: 1.15 parts by weight of the amphiphilic macromolecular reversible addition-fragmentation chain transfer reagent (1) was stirred and dissolved in 35 parts of deionized water, then 7.5 parts by weight of St was added, and then added to the reactor after stirring and pre-emulsification , the reactor was heated to 80°C, kept stirring, and nitrogen was removed for more than 30 minutes; 0.01 parts by weight of KPS was added to the reaction system; after 1 hour of reaction, 5 parts by weight of aqueous sodium hydroxide solution was added, which contained 0.16 parts by weight parts of sodium hydroxide, continue to react for 0.2 hours to obtain R-AA m1 -b-St m2 -b-(St) n1 -T block copolymer, the block copolymer is stably dispersed in water in the form of particles to form a latex;

[0057] Second step: after the first step reaction finishes, add the nBA of 15 parts by weight and 20 parts by weight deionized water, adjust the reactor temperature to 45 ℃, then ad...

Embodiment 2

[0067] Step 1: Stir and dissolve 1.15 parts by weight of amphiphilic macromolecular reversible addition and fragmentation chain transfer reagent (1) in 50 parts by weight of deionized water, then add 7.5 parts by weight of St, stir and pre-emulsify and add to the reactor During the process, the temperature of the reactor was raised to 80°C, kept stirring, and nitrogen deoxygenation was carried out for more than 30 minutes; 0.01 parts by weight of KPS was added to the reaction system; after 1 hour of reaction, 4 parts by weight of sodium hydroxide aqueous solution was added, which contained 0.12 Parts by weight of sodium hydroxide, continue to react for 0.2 hours, obtain R-AA m1 -b-St m2 -b-(St) n1 -T block copolymer, the block copolymer is stably dispersed in water in the form of particles to form latex;

[0068] Second step: after the first step reaction finishes, add the nBA of 30 weight parts and the deionized water of 60 weight parts, regulate reactor temperature to 45 ℃...

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Abstract

The invention discloses a multi-block copolymer with narrow molecular weight distribution and a preparation method thereof. The present invention adopts reversible addition chain transfer radical polymerization technology, adopts emulsion polymerization system, and by controlling monomer feeding sequence, prepares a series of multi-block copolymers with narrow molecular weight distribution. The molecular weight of this series of multi-block copolymers is In line with theoretical expectations, the content of dead polymers is low, and the mechanical properties are greatly improved compared with traditional triblock copolymers. The invention has simple process equipment, energy-saving and environment-friendly process, cheap and easy-to-obtain raw materials, and realizes high control over the structure of the block number, block type, and block molecular weight in the block polymer, and is useful for preparing polymers with specific structures and functions. Materials provide a universally feasible means.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a multi-block copolymer with a narrow molecular weight distribution and a preparation method thereof. Background technique [0002] Block polymer is a special polymer obtained by linking two or more polymer chain segments with different properties. Because the compatibility between different blocks is generally low, it will spontaneously form nanoscale Microphase separation structure, with different properties from random copolymers, homopolymers and polymer blends, can be used in thermoplastic elastomers, blending compatibilizers, interface modifiers, etc., widely used in chemical industry, construction, Biomedicine and other fields. Compared with traditional di-block or tri-block copolymers, multi-block copolymers with more number of blocks and types of blocks have more excellent properties. Studies have shown that multi-block copolymers with the same composition have larger ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F2/26C08F2/38
CPCC08F2/38C08F2/26C08F293/005C08F2438/03C08F220/06C08F220/14C08F212/08
Inventor 方进伟罗英武高翔李伯耿
Owner ZHEJIANG UNIV