Quasi-isothermal measurement by TMDSC in isotactic polypropylene |
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Authors: | H Kaneko T Osada M Iijima |
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Institution: | (1) Department of Physics, Musashi Institute of Technology, Tamadutsumi 1-28-1, Setagaya-ku, Tokyo 158-8557, Japan |
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Abstract: | We measure the frequency dependences of complex heat flows for isothermally crystallized isotactic polypropylene (iPP) by
the quasi-isothermal TMDSC. Regarding the quasi-isothermal melting processes as a kind of the single relaxation process, we
analyze them by the Debye model. The resultant heat capacity of iPP is larger (about 11%) than usual thermodynamic heat capacity.
We also found that the excess of the heat capacity, C
p (excess), has non-monotonous temperature dependence. A simple model introducing some kinetic modes into amorphous producing
after and during temperature modulation can reproduce the temperature dependence of C
p (excess) very well. |
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Keywords: | Debye process excess heat capacity isotactic polypropylene quasi-isothermal TMDSC |
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