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Proton spin-lattice and spin-spin relaxation times in isotactic polypropylene—III. Effects of molecular weight

✍ Scribed by H. Tanaka

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
254 KB
Volume
21
Category
Article
ISSN
0014-3057

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📜 SIMILAR VOLUMES

Proton spin–lattice and spin–spin relaxa
Proton spin–lattice and spin–spin relaxation times in isotactic polypropylene. II. Effects of stretching ratio and temperature
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Proton spin-lattice, T I , and spin-spin, Tz, relaxation times of uniaxially stretched polypropylene film were measured at 40°C using a wide line pulse spectrometer operating at 19.8 MHz. T11, the longer T I , increases almost linearly with increasing stretching ratio, and Tza, Tz of the amorphous r

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Temperature dependence of proton spin-lattice and spin-spin relaxation times in isotactic polypropylene. Effect of annealing
✍ Hiroshi Tanaka; Fumie Kohrogi; Kazuhiko Suzuki 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 356 KB

The temperature dependences of the proton spin-lattice, Tt, and spin-spin, T2, relaxation times of isotactic polypropylene films with different thermal histories and atactic fraction were investigated. A T~ minimum occurs for both melt-quenched and annealed samples at about 70°C. It shifts to lower

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✍ Hiroshi Tanaka; Kiyohide Takagi 📂 Article 📅 1990 🏛 Elsevier Science 🌐 English ⚖ 309 KB

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