Study of Transformations among α, γ and γ' Forms in Nylon 12 by X-Ray and DSC

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Abstract
The transformation behaviors of nylon 12 were investigated using wide-angle X-ray diffraction (WAXD), X-ray fiber patterns and differential scanning calorimetry. The γ' form could be distinguished from the γ form in spite of their very similar WAXD patterns, because the γ form cannot be transformed into the α form, while the γ form can be so transformed under high pressure. The γ' to γ transformation occurs on annealing above 110°C at atmospheric pressure. The γ to γ' and α to γ' transformations occur on drawing at atmospheric pressure above 50°C and above 70°C, respectively. The transformation behaviors presented in this paper and in a previous paper [N. Hiramatsu, S. Hashida and S. Hirakawa: Jpn. J. Appl. Phys. 21 (1982) 651] are summarized.

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