Secondary crystallization of low-isotacticity polypropylene

•Lamellar thickness remains constant during the secondary crystallization.•The c-c-c bending mode shows less constrained vibrations along the lamellar thickness direction.•The log(t) dependence in crystallinity was discussed using the Seto−Frank model. This study aimed to clarify the secondary cryst...

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Published in:Thermochimica acta 2024-11, Vol.741, p.179867, Article 179867
Main Authors: Furushima, Yoshitomo, Toda, Akihiko, Kimura, Kazuo, Nakada, Masaru, Masuda, Akihiro, Nakamura, Kazuya, Takahashi, Hideaki, Tatsuki, Toshiumi, Okada, Kazuma, Ohkura, Masatoshi
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Language:English
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Crystallization kinetics
DSC-Raman
Polypropylene
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container_title Thermochimica acta
container_volume 741
creator Furushima, Yoshitomo
Toda, Akihiko
Kimura, Kazuo
Nakada, Masaru
Masuda, Akihiro
Nakamura, Kazuya
Takahashi, Hideaki
Tatsuki, Toshiumi
Okada, Kazuma
Ohkura, Masatoshi
description •Lamellar thickness remains constant during the secondary crystallization.•The c-c-c bending mode shows less constrained vibrations along the lamellar thickness direction.•The log(t) dependence in crystallinity was discussed using the Seto−Frank model. This study aimed to clarify the secondary crystallization process of low-isotacticity polypropylene (LT-PP). LT-PP demonstrates an exceptionally low crystallization rate at room temperature, which is approximately 1/5000 lower than that of isotactic PP (iPP). During the secondary crystallization of LT-PP at 30 °C, the thickness of lamellar (c-axis) and a- and b-axes of crystallite size remained constant. In addition, no significant change was observed in the CC-C bending vibration. It seems that the direction of the CC-C molecular order is similar to the thickness direction. This vibration mode may be associated with changes in the thickness of the lamellae. To explain the log(t) dependence of crystallinity, the Seto–Frank model was employed. [Display omitted]
doi_str_mv 10.1016/j.tca.2024.179867
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subjects Crystallization kinetics
DSC-Raman
Polypropylene
title Secondary crystallization of low-isotacticity polypropylene
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