縦波による高分子溶液の緩和現象 (II)

概要

論文の詳細を見る
The Ultrasonic absorption of Polyvinylacetate in acetone solution was measured by the pulse method over 5 MHz-75 MHz Within the temperature range from 0℃ to 20°. A thermal relaxation phenomenon was observed in this frequency range. A rotationary isomer model has been presented based on the observed molecular weight dependence of compressibility at 1 MHz. This model is composed of head-to-tail sequences of polymer chain bonds and involves a doubly degenerated ground state. The energy state in this model is found to be ⊿H^0= 1. 5±0. 5 Kcal/mol ⊿H^≠= 4. 8 Kcal/mol .
社団法人日本材料学会の論文
1971-05-15