K. Ute, Toshiyuki Tarao, S. Nakao
Dec 1, 2003
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0
Influential Citations
17
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Journal
Polymer
Abstract
Abstract 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 ( T g ), 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 T g than the corresponding polymethacrylates.