Multi-arm star-type thermoplastic elastomer synthesizing method

Abstract

This invention refers to a kind of synthetic method of poly-armed star-like polyolefin thermoplastic elastomer, which belongs to high molecular compound of carbon-and-carbon dangling bond reaction. The synthetic method is as follows: under the ordinary pressure, low temperature and the protection of dry nitrogen gas, get the soft section of active cation polyisobutylene synthetic rubber, hard section monomer of plastic and terminator from the component solvent, initiator, coinitiator and soft section monomer, then get the 4-armed star-like block thermoplastic elastomer, whose relative molecular weight is between 180000 and 250000 and whose molecular weight distributes between 2.0 and 3.5. The advantage of the invention lies in the high molecular weight and excellent performance and refers to many thermoplastic elastomers.

Description

technical field [0001] The invention relates to a synthesis method of a class of known polymer compounds; more specifically, the invention relates to a new synthesis method of a class of multi-arm star-shaped polyolefin thermoplastic elastomers. Background technique [0002] Thermoplastic elastomers are similar to vulcanized rubber at room temperature, and can be melt-processed like thermoplastics; they meet people's special requirements for material properties and processing, and develop rapidly. [0003] At present, the synthesis method of polyisobutylene thermoplastic elastomer is prepared by active cationic polymerization technology. For example, WO95 / 10554 patent provides a method for synthesizing block copolymers using end-capping agents, using tert-butyl dicumyl chloride and tricumyl chloride base chloride; with TiCl 4 For the initiating system, use 40:60 (V:V) mixed solvent of methyl chloride and HX; carry out living polymerization of isobutylene at -80°C, then add ...

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Problems solved by technology

[0003] At present, the synthesis method of polyisobutylene thermoplastic elastomer is prepared by active cationic polymerization technology. For example, WO95 / 10554 patent provides a method for synthesizing block copolymers using end-capping agents, using tert-butyl dicumyl chloride and tricumyl chloride base chloride; with TiCl 4 For the initiating system, use 40:60 (V:V) mixed solvent of methyl chloride and HX; carry out living polymerization of isobutylene at -80°C, then add end-capping agent 1.1-diphenylethylene, and then add isopropoxy acid Phthalophthalein, finally add p-methylstyrene to synthesize a tri-block copolymer of polyp-methylstyrene-polyisobutylene-poly-p-methylstyrene, and WO91 / 11468 patent provides polyisobutylene as the rubber soft segment, with Styrene, indene or derivatives of both are thermoplastic elastomers with hard segments, using dicumyl ether or tricumyl ether and TiCl 4 As an initiating system, the block polymer obtained by the above method has a wide molecular weight distribution and poor physical properties. In the synthesis of block polymers, there are very few properties related to thermoplastic elastomers.

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