架橋トランス1, 4 ポリイソプレンの化学レオロジー (I)

概要

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The stress relaxation of crosslinked trans-1, 4-polyisoprene (TPI) was measured at high temperatures. The relaxation curves were analyzed by the usual chemorheological method. The results were compared with those for crosslinked natural rubber (NR) which is the stereoisomer of TPI, and the difference in the behavior of oxidative degradation was discussed on the basis of the chemical structure. In this paper, the degradation behavior of dicumyl peroxide (DCP) vulcanizates was investigated. The stress relaxation curve of NR is so-called Maxwellian type, since the plotting of log f(t)/f(0) against time is represented by a straight line. (f(0): the initial stress, f(t); the stress at time t.) In this case the slope of this straight line may be regarded as the degradation rate. On the other hand, in the case of TPI, the plotting of log f(t)/f(0) against time is not a straight line but a curve which shows a rapid stress drop. It is confirmed that this rapid stress drop is independent of the remaining crystal parts and DCP. In order to elucidate the cause of rapid stress drop in TPI samples, IR spectra of degradated films were investigated. The result confirmed that the stress relaxation of crosslinked TPI is mainly due to the oxidative degradation.
社団法人日本材料学会の論文
1973-05-15