Abstract
Abstract Broad-line (proton) NMR measurements were made at temperatures from -15 to -96°C on crystals of poly(4-methyl pentene-1) wetted with a nonprotonated solvent, CS2. The mobile fraction, An, is found to depend on the crystal morphology and subsequent annealing treatments of dried crystals. An varies with temperature in the -30 to -70°C region; changes in the slope of the An vs temperature plot in this region with annealing treatment are interpreted in terms of changes in the amorphous portions of the lamellae. Previous NMR results for poly(trans-1, 4-butadiene) have been reanalyzed and the new An values obtained are given; annealing dry PTBD crystals at 80°C is shown to bring about a significant decrease in An.
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