The pure γ‐form of isotactic poly(propylene) can be obtained by melt‐crystallization starting from a fraction of a random ethylene‐propene copolymer (ethylene content 4 wt.‐%) soluble in p‐xylene at 28°C. Some structural models previously reported are tested by comparing calculated wide‐angle X‐ray diffraction patterns with the experimental ones. A method for the quantitative determination of the γ‐form crystallinity by X‐ray line profiles is proposed. The original copolymer and its fractions are characterized by differential scanning calorimetry and 13C NMR techniques.
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Marigo et al. (1989) studied this question.
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