Abstract
The line-shape of 13C-NMR spectra of highly crystalline isotactic polypropylene film during stretching and subsequent shrinkage was investigated. Well-resolved splittings of the resonance peaks of methylene and methyl carbons before stretching disappear with increasing stretching ratio ( λ > 10) and recover, although incompletely, by the subsequent shrinkage. Structural properties such as crystallinity and d-spacings of (110) and (040) planes were also measured during stretching and shrinkage. The crystallinity decreases with increasing stretching ratio. When the sample of λ = 10 was shrunk, ca 60% of ΔX c was recovered, where ΔX c is the difference between crystallinity before and after stretching. The d-spacings of (110) and (040) planes slightly change during stretching and recover almost to the initial values as a result of the shrinkage.
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