Preparation and properties of disyndiotactic poly(alkyl crotonate)s
Preparation and properties of disyndiotactic poly(alkyl crotonate)s
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双间同立构聚巴豆酸烷基酯的制备及性能
DOI：
10.1016/j.polymer.2003.10.005
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发表时间：
2003
期刊：
影响因子：
4.6
通讯作者：
T. Kitayama
中科院分区：
文献类型：
--
作者：
K. Ute;Toshiyuki Tarao;S. Nakao;T. Kitayama
以乙烯酮缩三烷基硅烷为引发剂，碘化汞为催化剂，碘代三乙基硅烷为助催化剂，通过基团转移聚合（GTP），合成了巴豆酸乙酯、正丙酯、异丙酯和正丁酯。主要是双间同立构聚合物的数均分子量范围从56，000至90，000几乎定量获得。测定了聚丁烯酸烷基酯的玻璃化转变温度（Tg）、折射率、透过率、冲击强度、杨氏模量、硬度、拉伸强度、断裂伸长率、透气系数和密度等热性能和力学性能。所有的聚巴豆酸酯具有比相应的聚甲基丙烯酸酯高65-90 °C的Tg。
Ethyl, n-propyl, iso-propyl and n-butyl crotonates were polymerized by group transfer polymerization (GTP) using ketene trialkylsilyl acetals as initiators in the presence of mercury (II) iodide as catalyst and iodotriethylsilane as co-catalyst. Predominantly disyndiotactic polymers with number-average molecular weights ranging from 56,000 to 90,000 were obtained almost quantitatively. Thermal and mechanical properties of poly(alkyl crotonate)s, such as glass transition temperature (Tg), refractive index, transmissivity, Izod impact strength, Young's modulus, hardness, tensile strength, tensile elongation at break, gas permeability coefficient and density were measured. All the polycrotonates have 65–90 °C higher Tgthan the corresponding polymethacrylates.