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Temperature dependence of proton spin-lattice and spin-spin relaxation times of highly stretched isotactic polypropylene film

✍ Scribed by Hiroshi Tanaka; Kiyohide Takagi

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
309 KB
Volume
26
Category
Article
ISSN
0014-3057

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✦ Synopsis

Proton spin-lattice, T~, and spin-spin, T 2, relaxation times of highly stretched isotactic polypropylene film were measured in the temperature range 40-110°C. There is a monotonical increase in T~, when measured at 40°C, as the stretching ratio is increased. A shorter T I, Tis, was observed for all samples. A plot of T~ vs (temperature)-~ shows clear differences in the T t behaviour between the samples stretched to 2 = 15 and 20; e.g. there is a somewhat longer T t for the sample stretched to 2 = 20. All samples exhibit three different T2s associated with the regions with different molecular mobility. T2~ (T2 of the most mobile amorphous regions) decreases gradually, when measured at 40°C, with increasing stretching ratio. The variation of T2a at high stretching ratio (2 > 10) is relatively small and an even higher T2, value was observed for the sample stretched to 2 = 20.

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