Study on the Brill transition of polyamide 6 with different crystal forms using low- and high-frequency Raman spectroscopy†

IF 3.9 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
RSC Advances Pub Date : 2025-01-23 DOI:10.1039/D4RA08523J
Jiacheng Gao and Harumi Sato
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Abstract

Polyamide 6 (PA6) in its α and γ-forms was studied from 30 to 220 °C using Raman spectroscopy in the low- and high-wavenumber regions. Quantum chemical calculations were employed to assist with band assignments. In the low-wavenumber region, a peak at approximately 100 cm−1, attributable to a mixed mode of methylene lateral motion and amide group stretching, was observed. Additionally, a new band at approximately 60 cm−1 was observed and assigned to molecular chain torsions in the α-form. Both bands indicated that molecular chain rotation occurs prior to the Brill transition at approximately 130 °C. In the high-wavenumber region, bands at approximately 1126 cm−1 and 1060 cm−1 indicated a simultaneous weakening of C–C stretching modes in the trans conformation at the same temperature, consistent with observations in the low-wavenumber region.

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来源期刊
RSC Advances
RSC Advances chemical sciences-
CiteScore
7.50
自引率
2.60%
发文量
3116
审稿时长
1.6 months
期刊介绍: An international, peer-reviewed journal covering all of the chemical sciences, including multidisciplinary and emerging areas. RSC Advances is a gold open access journal allowing researchers free access to research articles, and offering an affordable open access publishing option for authors around the world.
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