Method of directly preparing beta intercrystalline polystyrene directly from monomer polymerization

Abstract

A process for preparing the syndiotactic beta-polystyrene directly from monomers polymerizing includes such steps as loading pure styrene in anhydrous non-oxygen reactor, adding C10-C30 hydrocarbon solvent, stirring while heating, adding main catalyst and cocatalyst, polymerizing in high-purity N2, washing with alcohol, filtering and drying.

Description

technical field [0001] The invention relates to a method for directly preparing beta-crystal syndiotactic polystyrene by monomer polymerization. Specifically, the β-crystal syndiotactic polystyrene resin is directly prepared through reasonable selection of solvent and polymerization temperature in the polymerization process. Background technique [0002] Syndiotactic polystyrene (sPS) is a new type of semi-crystalline thermoplastic engineering plastics. Its high melting point (270 ° C) and crystallinity endow sPS with excellent heat resistance, water resistance, chemical resistance, electrical insulation and dimensional stability. . There are four crystal forms of sPS reported in literature (Macromolecules 1990, 23, 1539): α, β, γ and δ forms. Among them, the main chains of the macromolecules in the α and β crystal forms adopt the all-trans folded chain (TT) conformation; the main chains of the macromolecules in the δ and γ crystal forms adopt the helical winding (TTGG) co...

AI Technical Summary

Problems solved by technology

However, this method first needs to obtain α crystals, and also needs to control the processing conditions such as melting and adding temperature and time, and the investment in supercritical equipment is large, and the processing conditions are harsh, which is not conducive to wide application in industrial production.

[0011] In summary, there have been no literature and patent reports on the real in-situ preparation of β-crystal syndiotactic polystyrene during the polymerization process so far.