Thermally stimulated depolarization currents of tactic polymethyl methacrylates and their mixtures |
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| Authors: | Ohara K Rehage G |
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| Institution: | (1) Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, 386 Ueda, Japan;(2) Institut für Pysik. Chemie der TU Clausthal, Clausthal-Zellerfeld, Germany |
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| Abstract: | Summary Thermally stimulated depolarization currents (TSDC) of atactic (a), syndiotactic (s) and isotactic (i) PMMA and mixtures ofs- andi-PMMA were measured. In pure tactic PMMA, TSDC peak was obtained at a temperature corresponding to the glass transition temperature of each PMMA. TSDC of mixtures isolated as precipitates from 1/1 and 1/2 (i/sweight ratio) mixed solutions showed a peak which can be attributed to the glass transition temperature of the stereocomplex. TSDC of original l/1 mixture showed two peaks which are ascribed to the glass transition temperature of residual i-PMMA and the stereocomplex. The results suggests that stereocomplex formation occurs ini/s weight ratio of 1/2 independent of the way of preparation.With 9 figures and 1 table |
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| Keywords: | Thermally stimulated depolarization current PMMA atactic syndiotactic isotactic stereocomplex glass transition |
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