Block copolymer containing block with glass transition temperature higher than 100 DEG C and method for preparing block copolymer

A technology of block copolymer and glass transition temperature, which is applied in the field of block copolymer materials, can solve problems such as limiting the application of materials, and achieve the effects of improving production efficiency, high conversion rate, and good control

Active Publication Date: 2012-10-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the glass transition temperature of its polystyrene block is only about 100°C, this will greatly limit the application of this type of material in high temperature fields.

Method used

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  • Block copolymer containing block with glass transition temperature higher than 100 DEG C and method for preparing block copolymer
  • Block copolymer containing block with glass transition temperature higher than 100 DEG C and method for preparing block copolymer
  • Block copolymer containing block with glass transition temperature higher than 100 DEG C and method for preparing block copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1 ((MeMBL-co-St) n3 -b-nBA n4 -b-(MeMBL-co-St) n5 The molecular weight of the three-block design is 30K-25K-30K, and the ratio of the number of units of MeMBL to St is 1:2):

[0050] The first step: 1.9 parts by weight of amphiphilic macromolecular reversible addition fragmentation chain transfer reagent (1) was stirred and dissolved in 85 parts by weight of water to form a uniform water phase, and then mixed with 11 parts by weight of St and 6 parts by weight of MeMBL Pour the oil phase together into the reactor and stir to mix. Raise the temperature of the reactor to 70°C, keep stirring, add 0.03 parts by weight of potassium persulfate after passing nitrogen gas for 30 minutes, add an aqueous solution containing 0.2 parts by weight of sodium hydroxide when the polymerization is initiated for 20 minutes, and continue the reaction for 20 minutes to obtain AA n1 -b-St n2 -b-(MeMBL-co-St) n3 -R polymer.

[0051] The second step: After the first step of th...

Embodiment 2

[0054] Embodiment 2 ((MeMBL-co-St) n3 -b-nBA n4 -b-(MeMBL-co-St) n5 The molecular weight of the three-block design is 30K-70K-30K, and the ratio of the number of units of MeMBL to St is 1:2):

[0055]The first step: 1.3 parts by weight of amphiphilic macromolecular reversible addition fragmentation chain transfer reagent (1) was stirred and dissolved in 62 parts by weight of water to form a uniform aqueous phase, and then mixed with 7.5 parts by weight of St and 4 parts by weight of MeMBL Pour the oil phase together into the reactor and stir to mix. Raise the temperature of the reactor to 70°C, keep stirring, add 0.02 parts by weight of potassium persulfate after passing nitrogen gas for 40 minutes, add an aqueous solution containing 0.17 parts by weight of sodium hydroxide when the polymerization is initiated for 20 minutes, and continue the reaction for 20 minutes to obtain AA n1 -b-St n2 -b-(MeMBL-co-St) n3 -R polymer.

[0056] The second step: after the first step of...

Embodiment 3

[0060] Embodiment 3 ((MeMBL-co-St) n3 -b-nBA n4 -b-(MeMBL-co-St) n5 The molecular weight of the three-block design is 30K-90K-30K, and the ratio of the number of units of MeMBL to St is 1:2):

[0061] The first step: 1.3 parts by weight of amphiphilic macromolecular reversible addition fragmentation chain transfer reagent (1) was stirred and dissolved in 62 parts by weight of water to form a uniform aqueous phase, and then mixed with 7.5 parts by weight of St and 4 parts by weight of MeMBL Pour the oil phase together into the reactor and stir to mix. Raise the temperature of the reactor to 70°C, keep stirring, add 0.02 parts by weight of potassium persulfate after passing nitrogen gas for 30 minutes, add an aqueous solution containing 0.16 parts by weight of sodium hydroxide when the polymerization is initiated for 20 minutes, and continue the reaction for 20 minutes to obtain AA n1 -b-St n2 -b-(MeMBL-co-St) n3 -R polymer.

[0062] Step 2: After the first step of reactio...

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Abstract

The invention discloses a block copolymer containing a block with the glass transition temperature higher than 100 DEG C and a method for preparing the block copolymer. In the method, the block copolymer latex is prepared by taking n-butyl acrylate as a soft segment and the random copolymer of styrene and gamma-methyl-alpha-methylene-gamma-butyrolactone as a hard segment, adopting an emulsion polymerization system and applying a reversible addition-fragmentation chain transfer free radical polymerization technology. The method adopts simple processes and equipment, and the processes are environmental-friendly and energy-saving; an amphipathic macromolecule reversible addition-fragmentation chain transfer reagent is adopted, has the dual functions of both a chain transfer reagent and an emulsifier, not only is the good monomer polymerization control realized, but also the traditional emulsifier is prevented from being used; the reaction has no inhibition period, the reaction speed is high and the final conversion rate is high; the colloidal particles are stably increased during the process; and the glass transition temperature of the hard segment of the product can reach 155 DEG C, and the block copolymer has a good application prospect in the field of high-heat-resistance thermoplastic elastomers.

Description

technical field [0001] The invention relates to a block copolymer material, in particular to a method for preparing block copolymer latex containing a block with a glass transition temperature higher than 100 DEG C by reversible addition-fragmentation chain transfer emulsion polymerization. Background technique [0002] As a kind of polymer material with rubber elasticity at room temperature and convenient plastic processing at high temperature, the market demand of thermoplastic elastomer is growing rapidly, among which the demand for styrenic block copolymer is the largest. According to reports, the market demand for styrenic block copolymers is expected to reach 2 million tons per year in 2013, nearly half of the global thermoplastic elastomer market demand. However, the heat-resistant temperature of styrenic block copolymers is limited by the glass transition temperature (100°C) of the polystyrene segment. When the temperature is close to 100°C, the mechanical properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F2/24
CPCC08F293/00C08F2/24C08F2/10
Inventor 许少宏高翔罗英武
Owner ZHEJIANG UNIV
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