Abstract
Phase transitions, including α-β phase transition and melting, of nylon-66, nylon-48 and blends were measured by simultaneous DSC-XRD and DSC-FT-IR. The molecular mechanism of α-β transition and melting of nylon-66 and blends were estimated from DSC-XRD and DSC-FT-IR. On the broad endothermic peak between 100 and 200 °C, spacing of (010/110) of α-form expanded from 0.36 nm to 0.40 nm, and spacing of (100) of α-form changed from 0.44 nm to 0.41 nm, then (100) of β-form appeared. The triclinic ab plane changed to the rhombohodral ab plane from 100 to 200 °C. The slide of hydrogen bonded sheet induced transition to the hexagonal β-form. Double melting peaks on DSC heating curve were due to the melting of two types of β-form consisted with weak and strong hydrogen bonded molecules. Composition dependence of α-β transition temperatures obtained by DSC-XRD and DSC-FT-IR showed good agreement with that of the equilibrium melting temperature. Nylon-66 and nylon-48 are thus in a miscible state at the molecular level.
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Zhang, G., Watanabe, T., Yoshida, H. et al. Phase Transition Behavior of Nylon-66, Nylon-48, and Blends. Polym J 35, 173–177 (2003). https://doi.org/10.1295/polymj.35.173
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DOI: https://doi.org/10.1295/polymj.35.173
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