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Method for preparing granular random/stereoblock polystyrene

A polystyrene and stereoblock technology, which is applied in the field of granular random/stereoblock polystyrene preparation, can solve problems such as low solubility, and achieve the effects of improving processing performance, preventing adhesion and optimizing processing performance.

Active Publication Date: 2015-01-07
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since stereoregular styrenic polymers tend to crystallize, they have very low solubility in styrene monomer or other inert solvents

Method used

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  • Method for preparing granular random/stereoblock polystyrene
  • Method for preparing granular random/stereoblock polystyrene
  • Method for preparing granular random/stereoblock polystyrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Under the protection of nitrogen, inject 0.10 mmol of neodymium octanoate, 2.00 mmol of diethylaluminum, 0.13 mmol of dichlorodiethylsilane and 0.1 ml of styrene into the baked ampoule filled with nitrogen, and age it ultrasonically for 45 minutes at 20°C . Inject 11.4 ml of styrene and 10 ml of n-hexane into the polymerization bottle, transfer the aged catalyst to the polymerization bottle, and shake and react at 50°C for 8 hours. Add an acidified ethanol solution containing 5-10% hydrochloric acid to the polymerization bottle to terminate the polymerization reaction, and the reaction product is washed by ethanol precipitation, and vacuum-dried at 40°C to constant weight to obtain granular atactic / stereoblock polyphenylene Ethylene is 6.18 g, the monomer conversion rate is 59.5%, and the weight average molecular weight is 4.61×105.

Embodiment 2

[0033] Under the protection of nitrogen, inject 0.14 mmol of neodymium isooctanoate, 1.40 mmol of triisobutylaluminum, 0.35 mmol of methyldichlorosilane and 0.1 ml of styrene into the baked ampoule filled with nitrogen, and age it ultrasonically at 35°C 60 min. Inject 12.8 ml of styrene and 15 ml of toluene into the polymerization bottle, transfer the aged catalyst to the polymerization bottle, and shake and react at 40°C for 12 h. Add an acidified ethanol solution containing 5-10% hydrochloric acid to the polymerization bottle to terminate the polymerization reaction, and the reaction product is washed by ethanol precipitation, and vacuum-dried at 40°C to constant weight to obtain granular atactic / stereoblock polyphenylene Ethylene is 8.89 g, the monomer conversion rate is 76.2%, and the weight average molecular weight is 8.96×104.

Embodiment 3

[0035] Under the protection of nitrogen, inject 0.16 mmol of neodymium neodecanoate, 4.00 mmol of diisopropylaluminum chloride, 0.05 mmol of propyltrichlorosilane and 0.1 ml of styrene into the ampoule filled with nitrogen after baking, at 50 °C Ultrasonic aging for 90 min. Inject 7.32 ml of styrene into the polymerization bottle, transfer the aged catalyst to the polymerization bottle, and shake and react at 55°C for 18 h. Add an acidified ethanol solution containing 5-10% hydrochloric acid to the polymerization bottle to terminate the polymerization reaction. The reaction product is washed by ethanol precipitation and dried in vacuum at 40 °C to constant weight to obtain 5.73 g of granular polystyrene. The monomer conversion The rate is 85.9%, and the weight average molecular weight is 7.62×104.

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Abstract

The invention discloses a method for preparing granular random / stereoblock polystyrene and relates to a method for preparing a polymer. According to the method, monomer styrene polymerization is catalyzed by using a rare-earth catalytic system, and the granular random / stereoblock polystyrene is produced. The process conditions of the polymerization condition are controlled, the molecular weight range of the polymer is controlled to be 1.6*10<4> to 1.0*10<6>, the fusing limit ranges from 160 DEG C to 270 DEG C, and the content of the stereo-regular polystyrene is 5-60 percent. The polystyrene has high heat resistance, chemical resistance, dimensional stability and mechanical property. Compared with stereo-regular polystyrene such as isotaxy polystyrene (iPS) or syndiotaxy polystyrene (sPS), the granular random / stereoblock polystyrene disclosed by the invention has the advantage that the processability is obviously improved. Due to the special dissolubility and granular form of the obtained polystyrene, a kettle sticking phenomenon existing in the body and suspension process is effectively avoided. The polymerization system contributes to improving the stability and monomer conversion rate of the polymerization reaction system, and the polymerization process and production equipment are simplified.

Description

technical field [0001] The invention relates to a method for preparing polymers, in particular to a method for preparing granular random / stereoblock polystyrene. Background technique [0002] Styrene monomer and its derivatives can be polymerized by different polymerization methods such as free radical polymerization, anionic polymerization, cationic polymerization and coordination polymerization to obtain styrene polymers with different stereoregularities such as atactic, isotactic and syndiotactic. The diverse molecular structure endows polystyrene with different performance ranges and different application fields. [0003] Atactic polystyrene aPS has many performance advantages, such as colorless and transparent, excellent high-frequency dielectric and arc resistance, easy to color, excellent processability, but its random molecular chain structure makes it unable to crystallize, so aPS Poor heat resistance, low operating temperature; poor weather resistance, easy to cha...

Claims

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Application Information

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IPC IPC(8): C08F112/08C08F4/58C08F4/52C08F2/06C08F2/02
Inventor 杨凤刘奇王伟泽毕吉福张学全
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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