Method of preparing game intercrystalline regular polystyrene directly from monomer polymerization

A polystyrene and monomer polymerization technology, which is applied in the field of directly preparing γ-crystalline syndiotactic polystyrene by monomer polymerization, and achieves the effects of reducing processing equipment, simplifying the removal process and easy process control.

Inactive Publication Date: 2007-03-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In summary, there have been no literature and patent reports on the real in-situ preparation of γ-syndiotactic polystyrene during the polymerization process so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～13

[0021] All polymerizations described in the examples were carried out in 100 ml glass manifolds equipped with twin ribbon stirring impellers. Styrene monomer is adsorbed by high-temperature treated alumina, followed by pressure distillation; the solvent is also purified by treated high-activity alumina. Before the reaction, the whole system was heated at 90°C under vacuum for more than 3 hours, and replaced with high-purity nitrogen for 3 or 4 times. After adjusting to a certain polymerization reaction temperature, the refined monomer styrene, C 12 ~C 30 The hydrocarbon solvent, 1.5 mol / liter of triisobutylaluminum (TIBA), 1.5 mol / liter of methyl aluminoxane (MAO) and the main catalyst start the reaction. The polymerization process was carried out under the protection of high-purity nitrogen. After one hour of polymerization, acidified ethanol was added to terminate and precipitate, and the product was repeatedly washed with excess ethanol, filtered with suction, and vacuum-...

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PUM

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Abstract

A process for preparing the syndiotactic gamma-polystyrene directly from monomers copolymerizing includes such steps as loading the pure styrene in anhydrous non-oxygen reactor, adding C12-C30 hydrocarbon solvent, stirring while heating, adding main catalyst and cocatalyst, polymerizing in high-purity N2, washing with alcohol, filter and drying.

Description

technical field [0001] The invention relates to a method for directly preparing gamma syndiotactic polystyrene by monomer polymerization. Specifically, the gamma 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) confo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F112/08C08F4/642
Inventor 李伯耿余波
Owner ZHEJIANG UNIV
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