SYNTHESIS AND CRYSTALLIZATION BAHAVIOR OF ISOTACTIC POLYSTYRENE

LIAO Kai-rong; LU Ze-jian; SHEN Jian; LIN Shang-an

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SYNTHESIS AND CRYSTALLIZATION BAHAVIOR OF ISOTACTIC POLYSTYRENE

Research Article | 更新时间：2021-03-19

- SYNTHESIS AND CRYSTALLIZATION BAHAVIOR OF ISOTACTIC POLYSTYRENE
- Acta Polymerica Sinica Issue 3, Pages: 263-268(1994)
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- Published：20 June 1994，
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LIAO Kai-rong, LU Ze-jian, SHEN Jian, LIN Shang-an. SYNTHESIS AND CRYSTALLIZATION BAHAVIOR OF ISOTACTIC POLYSTYRENE. [J]. Acta Polymerica Sinica (3):263-268(1994)
DOI：

LIAO Kai-rong, LU Ze-jian, SHEN Jian, LIN Shang-an. SYNTHESIS AND CRYSTALLIZATION BAHAVIOR OF ISOTACTIC POLYSTYRENE. [J]. Acta Polymerica Sinica (3):263-268(1994) DOI：

摘要

用负载型钛系催化剂ＭｇＣｌ２／ＴｉＣＬ４，ＮｄＣｌ３／ＡｌＥｔ３（ＳＮ－１催化剂）在甲苯溶剂中进行苯乙烯的定向聚合，单体转化率。催化效率和产物的等规度随单体浓度增大先是提高，达到最大值后，逐渐下降，等规度最高可达９８％．产物的分子量则随单体浓度增大而增大．ＤＳＣ测定表明，产物中的无规物（ａＰＳ）有利于等规聚苯乙烯（ｉＰＳ）结晶，但对结晶的熔点有降低作用．向产物加入更多的ａＰＳ则由于稀释效应而使ｉＰＳ的结晶度线性下降．在聚乙烯（ＰＥ）／ｉＰＳ共混物中，ＰＥ含量对ｉＰＳ的结晶度无显著影响；但在聚碳酸酯（ＰＣ）／ｉＰＳ共混物中，ＰＣ含量对ｉＰＳ的结晶度影响较复杂．

Abstract

tereospecific polymerization of styrene was conducted in toluene using theMgCl_2/TiCl_4

NdCl_3/AlEt_3 catalyst. With increasing monomer concentration

the molecular weight of the products are increase while the polymer yield

the catalytic efficiency

and the isotacticity of the products are all first increased

reaching a maximun

and then decreased gradually. A maximum isotacticity of 98% of the products has been obtained. Results of DSC determinations show that an adequate content of atactic polystyrene(aPS) is favourable of the crystallization of isotactic polystyrene(iPS)

but the addition of more aPS linearly decreases the crystallinity of iPS because of the dilution effect. The content of polyethylene(PE) in blends of iPS/PE has no significant influence on the crystallinity of iPS while polycarbonate (PC)excerts a more complicate effect on the crystallinity of iPS in iPS/PC blends.

关键词

齐格勒－纳塔型催化剂等规聚苯乙烯合成结晶性能

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Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, State Key Laboratory of Polymer Materials Engineering, National Engineering Laboratory of Eco-Friendly Polymeric Materials Sichuan, Sichuan University

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