Isotactic Polystyrene Reactor Blends with Tailored Bimodal Molar Mass Distribution
Isotactic Polystyrene Reactor Blends with Tailored Bimodal Molar Mass Distribution
复制标题
DOI：
10.1021/ma401770m
复制
发表时间：
2013-10
期刊：
影响因子：
5.5
通讯作者：
M. Vielhauer;S. Bodendorfer;P. Lutz;C. Friedrich;R. Mülhaupt
中科院分区：
文献类型：
--
作者：
M. Vielhauer;S. Bodendorfer;P. Lutz;C. Friedrich;R. Mülhaupt
反应器共混形成可溶的高等规聚苯乙烯（iPS），可以调整双峰iPS的摩尔质量分布，其中包含可变量的超高摩尔质量iPS （UHMWiPS）。一个关键的特点是易于控制iPS的摩尔质量，通过在mao活化的双酚酸钛催化剂上催化苯乙烯均相聚合，使用1,9-十二烯作为链转移剂。而在没有二烯的情况下形成的UHMWiPS (Mw为947000 g mol-1)，随着二烯/苯乙烯摩尔比的减小，其摩尔质量Mw从191000增加到482000 g mol-1。在两个平行反应器的级联中，在存在和不存在二烯的情况下聚合苯乙烯，所得到的两种iPS溶液的混合比例决定了反应器混合物（RB-2）的UHMWiPS含量。因此，在不影响两种共混组分的平均摩尔质量的情况下，iPS和UHMWiPS的含量发生了变化。在反应器共混物（RB-1）中，在单反应器中延迟注入二烯，摩尔质量和多聚体…
Reactor blend formation of soluble highly isotactic polystyrene (iPS) enables tailoring of bimodal iPS molar mass distributions containing variable amounts of ultrahigh molar mass iPS (UHMWiPS). A key feature is the facile iPS molar mass control, achieved by homogeneous catalytic styrene polymerization on a MAO-activated titanium bisphenolate catalyst, using 1,9-decadiene as chain transfer agent. Whereas UHMWiPS (Mw of 947 000 g mol–1) is formed in the absence of the diene, the molar mass Mw increases from 191 000 to 482 000 g mol–1 with decreasing diene/styrene molar ratio. In a cascade of two parallel reactors, polymerizing styrene in the presence and the absence of diene, the mixing ratio of the resulting two iPS solutions governs the UHMWiPS content of the reactor blends (RB-2). Hence, the contents of iPS and UHMWiPS are varied without affecting the average molar mass of both blend components. In reactor blends (RB-1), produced in a single reactor with delayed diene injection, molar mass and polydispe...