The synthesis and modification of fully branched hyperbranched polymer
(0) Hyperbranched polymers have drawn much attention as an attractive alternative to dendrimers, due to their simple one-pot synthesis for instance by polycondensation of AB2 monomers. However, a branching degree (DB)of 100 ％, a characteristic feature of dendrimers, can not be achieved unless post-grafting is applied or when certain requirements are met.Because the unreacted B groups are distributed over terminal and linear units,hyperbranched polymers can not be functionalized as selectively as dendrimers, where, from a sufficiently high generation on, the end groups are mainly concentrated at the molecular surface. However, a variety of applications of dendrimers arise from the possibility of discriminating upon fictionalization between the focal,branched or peripheral moieties.In this respect, it could be helpful to develop a strategy to modifiable hyperbranched polymers with a 100 ％ branching degree as, due to the absence of linear units, the only B groups present are located at the terminal units. Although the structural and topological homogeneity of such hyperbranched polymers is still rather poor as compared to dendrimers and although the terminal units are not necessarily located at the periphery of the molecule, the feature of a DB of 100％ could to some extent facilitate a more selective functionalization of the periphery and the interior.
Yu Fu Xi Zhang Mario Smet Wim Dehaen
Center for Molecular Science and Engineering,Northeastern University,China Department of Chemistry,Tsinghua University,P.R.China Department of Chemistry,University of Leuven,Belgium
国际会议
5th International Symposium on High-Tech Polymer Materials(HTPM-V)(第五届国际高技术高分子材料学术会议)
北京
英文
60-61
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）