作者:Genny E. Keefe、Jean-d'Amour K. Twibanire、T. Bruce Grindley、Michael P. Shaver
DOI:10.1139/cjc-2012-0471
日期:2013.6
A family of polymer stars has been prepared from early generation dendritic cores with four, six, and eight arms. Four dendritic cores were prepared from the sequential reaction of a multifunctional alcohol with a protected anhydride, followed by deprotection to afford two or three new alcohol functionalities per reactive site. These cores were used as initiators for the tin-catalyzed ring-opening
已经从具有四、六和八臂的早期树枝状核制备了一系列聚合物星。通过多官能醇与受保护酸酐的顺序反应制备了四个树枝状核,然后脱保护以在每个反应位点提供两个或三个新的醇官能团。这些核被用作锡催化的 l-丙交酯和外消旋丙交酯的开环聚合反应的引发剂,分别得到等规和无规可降解星。为每个单体制备了两个系列的星形,要么保持总分子量,要么保持每个臂的单体单元数。通过核磁共振光谱、光散射凝胶渗透色谱、差示扫描量热法和热重分析对聚合物进行了表征。我们的结果支持先前的工作,即臂的长度决定了恒星的热特性而不是总分子量。芳香族和脂肪族化合物之间几乎没有影响。