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Crystallization behavior of isotactic polystyrene quenched at different temperatures
Author(s) -
Petrillo E.,
Romano G.,
Russo R.,
Vittoria V.
Publication year - 1996
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(199605)7:5/6<478::aid-pat508>3.0.co;2-y
Subject(s) - materials science , crystallization , differential scanning calorimetry , quenching (fluorescence) , fourier transform infrared spectroscopy , amorphous solid , polystyrene , analytical chemistry (journal) , tacticity , infrared microscopy , chemical engineering , infrared , crystallography , polymer , thermodynamics , composite material , fluorescence , organic chemistry , optics , chemistry , physics , engineering , polymerization
Films of isotactic polystyrene (iPS) were quenched at different temperatures (0, 40, 100°C). Wide‐angle X‐ray diffractograms, differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR) show that the three samples are amorphous; slight differences were found in the density values and in the dynamic‐mechanical behavior. At variance, transport properties of methylene chloride vapor show that the higher the quenching temperature, the lower the sorption at low vapor activity. The data are consistent with the presence, in the amorphous samples quenched at higher temperatures, of domains impermeable to vapors at low activity. The crystallization of the three samples at 140°C, investigated with different techniques, such as DSC, FTIR and polarized optical microscopy, also reveals a different behavior. The kinetics of the crystallization become faster, the higher the quenching temperature. This result suggests the presence of domains that behave as nuclei of crystallization.