THE ASSOCIATION OF LIVING POLYSTYRYLLITHIUM IN BENZENE

作     者：张广照 

作者机构：Department of Chemical PhysicsDepartment of Polymer Science and Engineering The University of Science and Technology of China 

出 版 物：《Chinese Journal of Polymer Science》 (高分子科学（英文版）)

年 卷 期：2009年第27卷第3期

页      面：407-414页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 0817[工学-化学工程与技术] 08[工学] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the Hong Kong Special Administration Region Earmarked Grants(CUHK4036/05P,2160269) the Chinese Academy of Sciences Special Grant(No.KJCX2-SW-H14) China Postdoctoral Science Foundation(No.20070420727) the National Natural Science Foundation Project(No.20574065) 

主　　题：Light scattering Anionic polymerization Aggregate 

摘      要：The effects of the chain length, active end group and concentration on the association of living polystyryllithium (PS(-)Li(+)) chains in benzene were examined by a combination of static and dynamic laser light scattering in a cuvette equipped with a high-vacuum stopcock. The results show that long PS(-)Li(+) chains (M(w) 1 x 10(4)) usually form dimers in the solution. In contrast, shorter PS(-)Li(+) chains exhibit two relaxation modes, where the fast mode is related to the translational diffusion of the living chain dimers. The end capping of the living chain with bulky 1,1-diphenylethene (DPE) leads to an intensity increase of the slow mode, indicating that the slow mode is not due to the chain aggregates but to temporal aggregates or long-range density fluctuation induced by weak electrostatic dipole-dipole interaction between ionic pairs at the chain ends.