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首页> 外文期刊>RSC Advances >Synthesis of polystyrene-based Y-shaped asymmetric star by the combination of ATRP/RAFT and its thermal and rheological properties
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Synthesis of polystyrene-based Y-shaped asymmetric star by the combination of ATRP/RAFT and its thermal and rheological properties

机译：用ATRP / RAFT及其热流变性质的组合合成聚苯乙烯的Y形不对称星

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A _(2) A′-type asymmetric stars and A _(2) B-type miktoarm star polymers were prepared by the combination of atom transfer radical polymerization (ATRP) and reversible addition-fragmentation chain transfer polymerization (RAFT) using the designed initiator. The first step involved the preparation of linear polystyrene with a hydroxyl group (LPSOH) by ATRP using the synthesized initiator 4,4′-di(bromomethyl)benzhydrol. Styrene was polymerized in bulk at 110 °C in the presence of Cu( I )Br and 2,2′-bipyridyl (Bipy) as a catalytic system. Next, the hydroxyl group in the resulting LPSOH chains was esterified to obtain LPS containing thiocarbonylthio (LPSCS _(2) ) chains. The last step consisted of growing the third PS chain or poly-( n -butyl acrylate) chain by RAFT. This methodology enabled us to synthesize A _(2) A′ triarm PS stars with asymmetry in the molar mass of their branches and A _(2) B stars with chemically different PS and PBA arms. It also provided us a facile way to synthesize Y-shaped polymers. The effects of the length of the backbone and branched chain on the thermal properties and the rheology of the synthesized asymmetric polystyrene were studied. This method provided a way to obtain well-defined polymers with fixed backbone but different branch length. On using this method grams of sample can be obtained for melt behavior study.
机译：A'型不对称恒星和A _（2）B型Miktoarm星聚合物通过原子转移自由基聚合（ATRP）和可逆添加 - 碎片链转移聚合（筏）使用设计的组合制备发起人。第一步涉及通过ATRP使用合成引发剂4,4'-DI（溴甲基）苯甲醇用羟基（LPSOH）用羟基（LPSOH）制备。在Cu（I）Br和2,2'-双吡啶（Bipy）存在作为催化体系的情况下，在110℃下搅拌苯乙烯在110℃下聚合。接下来，酯化得到的LPSOH链中的羟基以获得含有硫代羰基硫基（LPSC _（2））链的LPS。最后的步骤包括通过筏生长第三PS链或聚 - （N-丙烯酸丁酯）链。该方法使我们能够在其分支的摩尔质量的摩尔质量中合成具有不对称的_（2）的'Triarm PS恒星，以及具有化学不同的PS和PBA臂的_（2）B颗星。它还为我们提供了一种合成Y形聚合物的容易方式。研究了骨架和支链长度对合成不对称聚苯乙烯的热性质和流变学的影响。该方法提供了一种方法来获得具有固定骨架但不同分支长度的明确定义的聚合物。使用这种方法，可以获得克熔体行为研究的样品克。

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