Styrene copolymers with reversible cross bonds and preparation method of styrene copolymers

A technology of cross-linked copolymer and styrene, applied in the field of styrene copolymer and its preparation, can solve the problem of losing secondary molding and the like, achieve good solvent resistance and overcome the effect of no secondary processing ability

Active Publication Date: 2017-11-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although conventional chemical crosslinking can improve its solvent resistance, it loses the ability of secondary molding

Method used

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  • Styrene copolymers with reversible cross bonds and preparation method of styrene copolymers
  • Styrene copolymers with reversible cross bonds and preparation method of styrene copolymers
  • Styrene copolymers with reversible cross bonds and preparation method of styrene copolymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Preparation of hydroxylated styrene-ethylene / butylene-styrene linear block copolymers by anionic polymerization

[0043]Vacuumize the 1L polymerization kettle, replace it with high-purity nitrogen three times, and add 650ml of purified cyclohexane first, with a designed solid content of 10%. According to table 1 and table 2 proportioning feed, first add p-4-vinylbenzyl acetate and styrene mixed monomer, 0.25ml tetrahydrofuran of the first section, start stirring, then add n-butyllithium solution according to table 2 ( Concentration 0.5M), react at 40°C for 1 hour, then add butadiene, continue to react for 1 hour, and finally add the third stage of 4-vinylbenzyl acetate and styrene mixed monomer, and react for another 1 hour. After the reaction is over, the polymerization liquid is pressed into the hydrogenation tank, and hydrogen gas is introduced to terminate the reaction. Half an hour later, add 1 mL of methyl o-toluate with a concentration of 0.02 mol / L, 30 mg o...

Embodiment 2

[0057] (1) Preparation of hydroxyl-containing star-shaped styrene-ethylene / butylene-styrene block copolymers by anionic polymerization

[0058] According to the prescription of 1-4, 1-5, 1-6 and 1-7 in table 1, synthesize the linear styrene-butadiene-styrene linear block copolymer containing 4-vinylbenzyl acetate structural unit , after adding the third-stage reaction monomer and reacting for 1 hour, press the material into the hydrogenation tank, add the coupling agent according to the formula in Table 4, and continue the reaction at 40°C for 30 minutes to obtain the structure containing 4-vinylbenzyl acetate Unit star styrene-butadiene-styrene block copolymer glue.

[0059] After the reaction was completed, hydrogenation was performed according to the method of Example 1, and the product was precipitated and dried to obtain a star-shaped styrene-ethylene / butylene-styrene block copolymer glue with 4-vinylbenzyl acetate structural units.

[0060] Dissolve the product in n-oct...

Embodiment 3

[0070] (1) Preparation of hydroxylated styrene-ethylene / propylene-styrene block copolymers by anionic polymerization

[0071] Vacuumize the 1L polymerization kettle and replace it with high-purity nitrogen three times. First add 650ml of purified cyclohexane with a designed solid content of 15%, and then feed according to the formula in Table 6 and Table 7. First add the first stage of 4-acetoxystyrene and styrene mixed monomer, 1g tetrahydrofurfuryl alcohol ethyl ether, start stirring, then add tert-butyllithium solution (concentration 0.5M), react at 60°C for 50min, Then the temperature was raised to 70° C. and isoprene was added, and the reaction was continued for 1 hour. Finally, the third stage of p-4-acetoxystyrene and styrene mixed monomer was added, and the reaction was continued for 1 hour. After the reaction is over, the polymerization liquid is pressed into the hydrogenation tank, and hydrogen gas is introduced to terminate the reaction. After half an hour, 30mg of...

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Abstract

The invention discloses styrene copolymers with reversible cross bonds as well as a preparation method and an application of the styrene copolymers. Styrene copolymers with furan groups and polyfunctional maleimide derivatives react to produce reversible cross bonds, and the solvent resistance of styrene copolymer materials is improved. The reversible cross bonds in the styrene copolymer materials with the reversible cross bonds can be disconnected at the high temperature, and the materials have secondary processability and can be reused.

Description

technical field [0001] The invention belongs to styrenic copolymers, in particular to a styrenic copolymer with reversible crosslinking bonds and its preparation method and application. Background technique [0002] Styrenic copolymers are a class of polymer materials with polystyrene segments in the molecular chain, such as polystyrene / butadiene / styrene block copolymer (SBS), styrene / ethylene-butylene / Styrene Block Copolymer (SEBS), Polystyrene / Isoprene / Styrene Block Copolymer (SIS), Polystyrene / Isoprene / Styrene Block Copolymer (SIS), Polystyrene Ethylene / ethylene-propylene / styrene block copolymer (SEPS), polystyrene / ethylene-propylene block copolymer (SEP), etc. There is a phase region formed by the interpenetration of the soft segment and the hard segment of the molecular chain in the matrix of these materials. At room temperature, the soft segment and the hard segment are respectively in a viscous fluid state and a glass state, but the hard segment restricts the flow o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/14C08F8/12C08F8/04C08F8/30C08F297/04C08F212/14C08F212/32C08F210/10C08F236/06C08F236/08C08F212/12C08F212/08C08J3/24C08L53/02C08L25/02C08L9/06C08L23/22
CPCC08F8/14C08F8/30C08F210/10C08F212/32C08F236/08C08J3/24C08J2309/06C08J2323/22C08J2325/02C08J2353/02C08L2203/202C08F8/12C08F8/04C08F297/048C08F297/04C08F212/08C08F236/06C08F212/12C08F212/14
Inventor 张爱民徐雨
Owner SICHUAN UNIV
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