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首页> 外文期刊>Journal of Applied Polymer Science >SYNDIOTACTIC POLYSTYRENE PREPARATION IN A RIM PROCESS
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SYNDIOTACTIC POLYSTYRENE PREPARATION IN A RIM PROCESS

机译：RIM过程中的间规聚苯乙烯制备

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摘要

Very few polymeric systems are suitable for preparing engineering parts using reaction injection molding (RIM) processing. A new two-component metallocene catalyst, which is able to polymerize bulk styrene at high rates to the syndiotactic form, was studied. The catalyst used in this work was based on monocyclopentadienyl analogs of titanium (Cp*TiMe(3)), which was used in conjunction with a boron cocatalyst [B(C6F5)(3)]. When separate streams of the catalyst and cocatalyst, dissolved in either styrene or styrene/toluene solutions, met in a mixhead, the styrene polymerized rapidly to form crystalline, syndiotactic polystyrene (s-PS). Using a bench scale RIM device, the monomer conversion during polymerization was monitored through the quasi-adiabatic temperature rise, recorded by a rapid data acquisition system. The rate equation was found to be second order with respect to the monomer concentration and first order with respect to the catalyst concentration, given some assumptions. The s-PS was brittle and attempts were made to incorporate elastomer toughening into the reacting system. Several potential problems associated with using this system for RIM process are discussed. (C) 1996 John Wiley & Sons, Inc. [References: 20]
机译：很少有聚合物系统适合使用反应注射成型（RIM）工艺制备工程零件。研究了一种新型的双组分茂金属催化剂，该催化剂能够将本体苯乙烯以高速率聚合为间同形式。在这项工作中使用的催化剂是基于钛的单环戊二烯基类似物（Cp * TiMe（3）），它与硼助催化剂[B（C6F5）（3）]结合使用。当溶解在苯乙烯或苯乙烯/甲苯溶液中的催化剂和助催化剂的单独物流在混合头中混合时，苯乙烯迅速聚合形成结晶的间规聚苯乙烯（s-PS）。使用台式RIM装置，通过准绝热温升监测聚合过程中的单体转化率，并通过快速数据采集系统进行记录。在给定一些假设的情况下，发现速率方程相对于单体浓度为二阶，相对于催化剂浓度为一阶。 s-PS是脆性的，并且试图将弹性体增韧结合到反应体系中。讨论了与使用该系统进行RIM过程相关的几个潜在问题。 （C）1996 John Wiley＆Sons，Inc. [参考：20]

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