Degree of branching of the hyperbranched polymers resulted from SCVP
Highly branched structure that contains a large number of terminal groups is the typical characteristic ofhyperbranched polymers. The degree of branching (DB) is one of the most important molecular parameters thatcan represent the architecture of hyperbranched polymers, and it is related to the physical properties of polymers,such as the glass transition temperature (Tg),1 the crystallinity2 and the viscosity in solution or melt. Generally,the branched molecules are synthesized by branched monomer ABg (g>l).3 The discovery of self-condensingvinyl polymerization (SCVP)4 makes it easy to synthesize hyperbranched polymers using linear AB-typemonomers. The A group is a double bond and B is a pendent group that can be transformed into an initiatingcenter by an external stimulus. Then the AB monomer becomes the AB* type inimer. The active B* groups canreact with a double bond in other molecules, thus, the double bond A is converted into a fresh active center, A*.Both the initiating group B* and the newly created propagating center A* can react with the double bonds ofother molecules. Further polymerization results in hyperbranched polymers. If there is less concentration ofstimulus than that of the initial monomer, both monomers and inimers will be present in the SCVP system, andthe architecture of the resulting polymers will depend on the stimulus to monomer ratio. On the other hand, thedifference of the reactivities between A* and B* affects molecular structures and parameters of products as well.In this work we devote ourselves to clarifying how these factors affect the degree of branching of the productsfor the general SCVP.
Zhiping Zhou
School of Materials Science and Engineering,Jiangsu University,Zhengjiang 212013,China
国际会议
5th East-Asian Polymer Conference(第5届东亚高分子学术研讨会)
上海
英文
70-72
2008-06-03（万方平台首次上网日期，不代表论文的发表时间）