Effect of slow monomer addition on molecular parameters of hyperbranched polymers synthesized in the presence of multifunctional core molecules  

作　　者：ZHOU ZhiPing1, Jia ZhengWei1 & YAN DeYue2 1School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China 2State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China 

出　　处：《Science China Chemistry》2010年第4期891-897,共7页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 20774038 & 50633010)

摘　　要：This study develops the kinetics for the slow monomer addition technique in the synthesis of hyperbranched polymers. Taking the conversion of monomer (x) as a variable, we derived the analytic expressions of molecular size distribution function, average degree of polymerization, polydispersity index and degree of branching. These expressions are not only amenable to the polymerization with high monomer conversion, but also appropriate to describe the whole polymerization process. Comparison with the one-pot polymerization indicates that the slow monomer addition technique improves the molecular weight distribution and increases the degree of branching for the products obtained.This study develops the kinetics for the slow monomer addition technique in the synthesis of hyperbranched polymers. Taking the conversion of monomer (x) as a variable, we derived the analytic expressions of molecular size distribution function, average degree of polymerization, polydispersity index and degree of branching. These expressions are not only amenable to the polymerization with high monomer conversion, but also appropriate to describe the whole polymerization process. Comparison with the one-pot polymerization indicates that the slow monomer addition technique improves the molecular weight distribution and increases the degree of branching for the products obtained.

关 键 词：HYPERBRANCHED polymer kinetics MOLECULAR weight distribution POLYDISPERSITY degree of branching 

分 类 号：O631.3[理学—高分子化学]