Cis 1,4-ポリブタジェンの化学レオロジー

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Polybutadiene is considered to be most promising elastomers in synthetic rubber industry as the result of remarkable improvement made on this material in recent years so that it contains now nearly all cis-1,4 in its structure. The chemorheological study of this material is in this way becoming a very interesting subject. For the measurement of stress relaxation two kinds of samples were used, the samples that were subjected to thoroughgoing extraction in aceton and benzene at room temperature after complete vulcanization, and therefore free from all chemical residue that might act as cross-linking agents, and the samples that were not subjected to extraction, and therefore retain chemical substances that might act as cross-linking agents. As was found by A.V. Tobolsky and others with natural rubber when f(t)/f(0) was plotted against log t, all cis-1,4 polybutadiene showed the Maxwellian decay with approximate exactness in unextracted samples as is shown in Figs. 4 and 5. It is clear from these figures that both cis 4 and Ameripol CB decay more rapidly in unextracted samples than in extracted samples at the temperature used in the present experiment. This phenomenon will be accounted for by the fact that the chemical impurities that remain in unextracted samples will accerelate the scission reaction. The samples shown in Figs. 2,3,4, and 5 are replotted in the form of log f(t) /f(0) vs. t, in Figs. 6,7,8, and 9 , respectively. From the slopes of the straight lines in Figs. 6,7,8, and 9, the values of k' can be obtained, the functions of T as the Maxwellian decay curve is expressed by equation (1).
社団法人日本材料学会の論文
1966-05-15

Cis 1,4-ポリブタジェンの化学レオロジー

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