The effect of casting conditions on the crystalline forms of nylon-6 films

Dodd, J.W.; Holliday, P.; Parker, Bob

doi:10.1016/0032-3861(68)90012-8

Cited by 6 publications

(1 citation statement)

References 4 publications

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“…In Figure 3, the following diffraction intensity relations can be seen clearly: (1) By measuring C and D on the diffraction curve of any specimen, values of A1 and B1 can be obtained from A1 = (D -B1)/0.28 and B1 = (C -A1)/0.23 (2) In the present study, the AdA1 and B2/B1 ratios were obtained as 0.28 and 0.23, respectively. Thus, the a and y contents can be determined as that 30°C is the upper limit for the formation of pure a form nylon-12, whereas 90°C is the lower limit for the formation of the pure y form.…”

Section: Effects Of Casting Temperature and Casting Rate Of Polymorphismsupporting

confidence: 56%

Effect of casting conditions on polymorphism of nylon‐12

Ishikawa

Nagai

Kasai

1980

J. Polym. Sci. Polym. Phys. Ed.

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Polymorphism in nylon‐12 film, which appears on casting from a phenol‐ethanol solution, has been investigated by x‐ray diffraction and infrared absorption. The casting temperature was varied from 30 to 130°C and the ambient atmospheric pressure from 50 to 760 Torr. Casting at 30°C gives only the α form, while casting above 90°C yields only the γ form. At intermediate temperatures, both α and γ forms are obtained, with the γ content increasing as the casting temperature and/or the rate of evaporation of solvent are increased. The ethanol component of the casting solvent appears to act only as a melting‐point depressant for phenol. In contrast, nylon‐6 film cast from the same solvent system between 30 and 160°C gives only the α form. It is proposed that the difference in polymorphism of nylons‐12 and ‐6 is caused by differences in molecular flexibility due to the length of the methylene chain.

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Section: Effects Of Casting Temperature and Casting Rate Of Polymorphismsupporting

confidence: 56%