Functionalized Syndiotactic Polystyrene Polymers Prepared by the Combination of Metallocene Catalyst and Borane Comonomer
作者:J. Y. Dong、E. Manias、T. C. Chung
DOI:10.1021/ma012215e
日期:2002.4.1
an effective route in the functionalization of s-PS polymer that involves the direct copolymerization of styrene with a borane-containing styrenic monomer, i.e., 4-[B-(n-butylene)-9-BBN]styrene (B-styrene). The reactivity ratios of the two comonomers are quite close, with r1 = 0.9 for styrene and r2 = 1.2 for B-styrene in the Cp*Ti(OMe)3/MAO catalyst system. A broad composition range of syndiotactic
本文讨论了s-PS聚合物功能化的有效途径,该途径涉及苯乙烯与含硼烷的苯乙烯单体即4- [B-(n-丁烯)-9-BBN]苯乙烯(B-苯乙烯)。两种共聚单体的反应率非常接近,在Cp * Ti(OMe)3 / MAO催化剂体系中,苯乙烯的r 1 = 0.9 ,B-苯乙烯的r 2 = 1.2 。已经制备了具有窄分子量和组成分布的间规聚(苯乙烯-共-B-苯乙烯)共聚物的宽组成范围。DSC和13进一步证明了无规共聚物的结构1 H NMR分析。随着B-苯乙烯浓度的增加,共聚物显示出玻璃化转变温度,熔点,结晶温度和结晶度的系统性降低。在高于8.4mol%的B-苯乙烯含量时,共聚物的结晶度完全消失。反过来,在共聚物中的硼烷基团是非常通用的,并且可以定量地转化成其他官能团,如羟基和酸酐基团,或转化为自由基引发剂用于原位自由基接枝聚合,以制备S-PS-克- PMMA接枝共聚物。