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Chain conformation change upon heating for pauci‐chain polystyrene microsphere made by microemulsion polymerization
Author(s) -
Ming Weihua,
Zhao Yiqiang,
Zhao Jun,
Fu Shoukuan,
Jones Frank N.
Publication year - 2000
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200004)155:1<85::aid-masy85>3.0.co;2-k
Subject(s) - polystyrene , materials science , microemulsion , glass transition , polymer chemistry , polymerization , fourier transform infrared spectroscopy , discontinuity (linguistics) , microsphere , chemistry , chemical engineering , polymer , composite material , pulmonary surfactant , mathematical analysis , mathematics , engineering , biochemistry
The conformation change of pauci‐chain polystyrene microsphere (micro‐PS) upon heating was investigated by in‐situ FTIR. For the peaks at 1492 and 1452 cm −1 due to phenyl ring semicircle stretch, there are two discontinuities in the plots of peak height versus temperature. The first discontinuity at around 100 °C corresponds to the glass transition. The second discontinuity at about 155 °C is in good agreement with the second exotherm in the first DSC scan, which clearly suggests a non‐negligible change of the chain conformation at this temperature. This finding may be of help in further illustrating the two exotherms of micro‐PS in its first DSC scan.