Open AccessRELATION BETWEEN Tg AND α-PEAK IN AMORPHOUS POLYMER PVC
Author(s) -
Jian Li,
Zhang Ye,
Zhang Sheng-Chun
Publication year - 1996
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.45.1359
Subject(s) - materials science , amorphous solid , quenching (fluorescence) , relaxation (psychology) , thermodynamics , intensity (physics) , glass transition , ageing , composite material , polymer , physics , chemistry , optics , crystallography , social psychology , biology , fluorescence , genetics , psychology
A systematic study of the effect of physical ageing and cooling rate on a-relaxation peak are carried out in PVC. It was said that a-peak and Tg are not the same concept. Both are closely connected with amorphous state, but show different behaviours in the same pre-treatment conditions: varying physical ageing time in sub- Tg or changing cooling rate from Tg + 20℃ to room temperature . Some interesting results were obtained as follows:When Tg lowers with increacing ageing time or decreacing cooling rate, a-peak temperature (Tα) keeps constant. On the other hand, the intensity of the a-peak decreases. This behaviour shows that a- relaxation peak is not a typical linear anelastic internal friction peak, as there is a quenching peak added on it.A detail discussion will be given in this paper.