作者:Jinwon Seo、Stanfield Y. Lee、Christopher W. Bielawski
DOI:10.1021/acs.macromol.8b02754
日期:2019.4.23
A dibromo derivative of Dewar benzene, trans-5,6-dibromobicyclo[2.2.0]hex-1-ene, was polymerized using ring-opening metathesis polymerization (ROMP). The reaction proceeded in a controlled manner as changing the initial monomer-to-catalyst ratio afforded monodispersed polymers with tunable molecular weights and growing polymer chains were extended upon subsequent exposure to additional monomer. Treatment
使用开环复分解聚合(ROMP)聚合杜瓦苯的二溴衍生物,反式-5,6-二溴双环[2.2.0]己-1-烯。随着改变初始单体与催化剂的比例,反应以受控的方式进行,从而得到分子量可调的单分散聚合物,并且在随后暴露于其他单体时,聚合物链的生长得以延长。用烷基锂试剂处理卤化聚合物导致消除,然后异构化以提供反式-聚(乙炔)。基于一系列的机理和光谱学研究,提出通过经历重排的环丁烯基中间体进行转化。发现该方法是通用的,因为制备了含卤代均聚物的三嵌段共聚物并将其转化为含聚乙炔的衍生物。使用凝胶渗透色谱法以及一系列光谱法(NMR,FT-IR,UV-vis和Raman)和分析技术对聚合物进行了表征。