Modulated differential scanning calorimetry: 2. Studies of physical ageing in polystyrene

Physical ageing in polystyrene (PS) has been studied by means of modulated differential scanning calorimetry (m.d.s.c.). The results show that there exists a characteristic annealing temperature at which relaxation enthalpy has a maximum value. When annealing below 65°C, another relaxation peak has...

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Bibliographic Details
Published in:Polymer (Guilford) 1996, Vol.37 (2), p.243-247
Main Authors: Hourston, D.J., Song, M., Hammiche, A., Pollock, H.M., Reading, M.
Format: Article
Language:English
Subjects:
modulated differential scanning calorimetry
physical ageing
polystyrene
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Summary:Physical ageing in polystyrene (PS) has been studied by means of modulated differential scanning calorimetry (m.d.s.c.). The results show that there exists a characteristic annealing temperature at which relaxation enthalpy has a maximum value. When annealing below 65°C, another relaxation peak has been found. The position of this relaxation peak, which changes with annealing temperature, lies approximately between 54 and 64°C. It has been postulated previously in the literature that the relaxation behaviour involves phenyl ring relaxation. As measured from heat capacity curves, this transition is evident as a shoulder on the glass transition. With increasing annealing temperature, the glass transition of PS increased slightly.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(96)81094-9