A General Approach for Estimating Lamella-Thickness Distribution in Polymers with Low-Frequency Raman Spectroscopy: Application to Lamella Formation in Crystallizing Polyethylene

Ashok Zachariah Samuel, Hiro o. Hamaguchi

研究成果: Article査読

3 被引用数 (Scopus)

抄録

A general method for estimating lamella-thickness distribution in semicrystalline polymers has been developed and applied to polyethylene (PE). The longitudinal acoustic mode (LAM) of PE appears at very low frequencies (i.e., (Formula presented.) 8–20 cm−1) in the Raman spectrum. It represents a distribution of lamellae of varying thicknesses. We propose a distribution function that converts a low-frequency LAM Raman band into the corresponding lamellae-thickness distribution. By using this distribution function, we can study lamella formation in crystallizing PE to elucidate the influence of supercooling and determine critical lamella thickness, the minimum chain length at which folding occurs, and the associated thermodynamic parameters accurately. This method has a general applicability toward the examination of polymer crystallization in an accurate and straightforward manner. Understanding the molecular details of polymer crystallization has applications, particularly in polymer thin-film photovoltaics and polymer processing, beyond its fundamental academic significance.

本文言語English
ページ(範囲)9333-9339
ページ数7
ジャーナルChemistry - A European Journal
24
37
DOI
出版ステータスPublished - 2018 7 2
外部発表はい

ASJC Scopus subject areas

  • Chemistry(all)

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