期刊
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
卷 45, 期 16, 页码 3524-3537出版社
WILEY
DOI: 10.1002/pola.22099
关键词
block copolymers; catalysis; differential scanning calorimetry; polyesters; ring-opening polymerization; size exclusion chromatography
The ring-opening polymerization of epsilon-caprolactone (epsilon-CL) and delta-valerolactone (delta-VL) using nine catalytic systems consisting of a combination of three C-2v zirconocene complexes and three borate cocatalysts is discussed. The polymerizations proceed in a well-controlled manner, producing polymers with relatively high molecular weights and narrow molecular weight distributions. Kinetic experiments of the polymerization of epsilon-CL with the catalytic system Cp2ZrMe2/B(C6F5)(3) (1) showed a linear dependence between polymerization yield and molecular weight with time, as well as between the molecular weight with the molar ratio of the monomer over the catalyst [epsilon-CL]/[Zr], indicating sufficient control of the polymerization reaction. The catalytic system (1) was utilized for the synthesis of well-defined block copolymers of MMA with epsilon-CL and delta-VL. All samples were characterized by size exclusion chromatography, nuclear magnetic resonance, and differential scanning calorimetry. (C) 2007 Wiley Periodicals, Inc.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据