Open AccessWAITING TIME EFFECT IN POLYBUTADIEN
Author(s) -
Kejia Zhu,
Xuying Qin,
Hong Chen,
Xiang Wang
Publication year - 1993
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.42.1612
Subject(s) - materials science , specific heat , thermodynamics , slow cooling , process (computing) , glass transition , physics , composite material , computer science , polymer , operating system
The specific heat of polybutadien was measured and it was found that at temperature Tg = 178K there is a glass transition and the specific heat near the transition temperature depends strongly on the cooling process of the sample. After waiting at temperature Tw for a time tw during the cooling process, we found that there are waiting time effects on the specific heat of a heating process: the anomalous Δcp at Tp increases with the waiting time tw. In thecase of Tw=169K, Δcp(tw) can be described by Kohlrausch law Δcp(tw){l-exp[-(tw/τ)β]} with β =0.47±0.03.