Temperature dependence of proton spin-lattice and spin-spin relaxation times in isotactic polypropylene. Effect of annealing
作者： Hiroshi Tanaka , Fumie Kohrogi , Kazuhiko Suzuki
DOI: 10.1016/0014-3057(89)90184-5
关键词: Viscoelasticity 、 Analytical chemistry 、 Chemistry 、 Spin–spin relaxation 、 Spin–lattice relaxation 、 Annealing (metallurgy) 、 Condensed matter physics 、 Relaxation (NMR) 、 Tacticity 、 Proton spin crisis 、 Amorphous solid 、 Organic chemistry 、 General Physics and Astronomy 、 Polymers and Plastics
摘要: Abstract The temperature dependences of the proton spin-lattice, T 1 , and spin-spin, 2 relaxation times isotactic polypropylene films with different thermal histories atactic fraction were investigated. A minimum occurs for both melt-quenched annealed samples at about 70°C. It shifts to lower temperatures increasing fraction. is longer sample than melt-quenched. For high temperatures, two values observed. Three values, in order 2c 2m 2a obtained all samples. With temperature, increase, while remains constant. crystalline regions decreases temperature. rate minimum, 1/ increases linearly amorphous except sample. viscoelasticity was also measured. peak tan δ falls as annealing raised. various does not correlate δ.
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