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Structural Phase Transitions of Aliphatic Nylons Viewed from the Simultaneous Measurements of WAXD and SAXS
Structural changes occurring in the high temperature region of doubly‐oriented nylon 10/10 sample have been investigated through the temperature‐dependent simultaneous measurements of wide‐angle and small‐angle X‐ray scatterings, and the results were compared with the infrared spectral data as well...
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Published in: | Macromolecular symposia 2006-10, Vol.242 (1), p.250-256 |
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container_title | Macromolecular symposia |
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creator | Tashiro, Kohji Takeuchi, Kazuhiro Ohta, Yasuaki Hanesaka, Makoto Hashida, Tomoko Yoshioka, Yayoi Ramesh, Chellaswami |
description | Structural changes occurring in the high temperature region of doubly‐oriented nylon 10/10 sample have been investigated through the temperature‐dependent simultaneous measurements of wide‐angle and small‐angle X‐ray scatterings, and the results were compared with the infrared spectral data as well as the molecular dynamics simulation results. In the Brill transition region of 150–180 °C the methylene segments are conformationally disordered with keeping the intermolecular hydrogen bonds. During this phase transition the stacked lamellar structure did not change very much: the lamellae are tilted by ca. 34° from the draw axis and the long period is almost 160 Å. In the temperature region immediately below the melting point the molecular chains were found to be contracted by ca. 10% the original repeating period and the intermolecular hydrogen bonds were almost broken, causing the violent rotational and translational motions of the chains around the chain axis. At the same time the long period increased remarkably from 160 Å to 410 Å and the originally tilted lamellae stood up in parallel to the draw axis. |
doi_str_mv | 10.1002/masy.200651034 |
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In the Brill transition region of 150–180 °C the methylene segments are conformationally disordered with keeping the intermolecular hydrogen bonds. During this phase transition the stacked lamellar structure did not change very much: the lamellae are tilted by ca. 34° from the draw axis and the long period is almost 160 Å. In the temperature region immediately below the melting point the molecular chains were found to be contracted by ca. 10% the original repeating period and the intermolecular hydrogen bonds were almost broken, causing the violent rotational and translational motions of the chains around the chain axis. 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In the temperature region immediately below the melting point the molecular chains were found to be contracted by ca. 10% the original repeating period and the intermolecular hydrogen bonds were almost broken, causing the violent rotational and translational motions of the chains around the chain axis. 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subjects | Applied sciences Exact sciences and technology Hydrogen bonds Infrared infrared spectra Lamellar structure nylon 10/10 brill transition Nylons Organic polymers Phase transformations phase transition Physicochemistry of polymers Properties and characterization Segments small-angle X-ray scattering Spectra Structure, morphology and analysis Translational motion wide-angle X-ray diffraction |
title | Structural Phase Transitions of Aliphatic Nylons Viewed from the Simultaneous Measurements of WAXD and SAXS |
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