TY - JOUR

T1 - Structure and Properties of Extensively Degraded Rubber Vulcanizates A Comparison between Experimental Result and Correction of f(t) =n(t)RT(α-α-2)

AU - Oikawa, Hidetoshi

AU - Murakami, Kenkichi

N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

PY - 1981

Y1 - 1981

N2 - Chemical stress relaxation is a unique technique to study the degradation of vulcanized natural rubber (NR). It is well-known that the relationship between the initial stress, f(0), and the initial network chain density, n(0), is given by eq. (1). (formula omitted)Thus far, eq. (2) has been used for degraded vulcanized NR. However, we have assumed that eq. (2) cannot be applied in the case of extensive degradation, and introduced a new method relating the netwark chain density with the number of scission in thermo-oxidative degradation of NR. Then, we have compared the network chain density calculated from relative stress with that calculated from the number of scission based upon the thermo-oxidative degradation of uncured—NR under the same degradative condition for DCP cured—NR. The values of the network chain density determined by the above two methods agreed with each other only in the early stage of degradation. However, it was found that eq. (2) is not valid as the degradation proceeds extensively. Consequently, a correction of eq. (2) has been advocated experimentally which is represented.

AB - Chemical stress relaxation is a unique technique to study the degradation of vulcanized natural rubber (NR). It is well-known that the relationship between the initial stress, f(0), and the initial network chain density, n(0), is given by eq. (1). (formula omitted)Thus far, eq. (2) has been used for degraded vulcanized NR. However, we have assumed that eq. (2) cannot be applied in the case of extensive degradation, and introduced a new method relating the netwark chain density with the number of scission in thermo-oxidative degradation of NR. Then, we have compared the network chain density calculated from relative stress with that calculated from the number of scission based upon the thermo-oxidative degradation of uncured—NR under the same degradative condition for DCP cured—NR. The values of the network chain density determined by the above two methods agreed with each other only in the early stage of degradation. However, it was found that eq. (2) is not valid as the degradation proceeds extensively. Consequently, a correction of eq. (2) has been advocated experimentally which is represented.

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U2 - 10.1678/rheology1973.9.1_44

DO - 10.1678/rheology1973.9.1_44

M3 - Article

AN - SCOPUS:85024311349

VL - 9

SP - 44

EP - 48

JO - Nihon Reoroji Gakkaishi

JF - Nihon Reoroji Gakkaishi

SN - 0387-1533

IS - 1

ER -