Intermediate States in the Melting Process of Low Molecular Weight Poly(ethylene oxide)

被引：1

作者：

Zhou, Hu

Feng, Jiachun

Wu, Peiyi ^{[1
]}

机构：

[1] Fudan Univ, Key Lab Mol Engn Polymers, Minist Educ, Shanghai 200433, Peoples R China

来源：

APPLIED SPECTROSCOPY | 2009年 / 63卷 / 11期

基金：

中国博士后科学基金; 美国国家科学基金会;

关键词：

Poly(ethylene oxide); PEO; Intermediate state; Melting; Two-dimensional infrared correlation analysis; 2D-IR correlation analysis; 2-DIMENSIONAL CORRELATION SPECTROSCOPY; INFRARED CORRELATION SPECTROSCOPY; TEMPERATURE-MODULATED DSC; REVERSIBLE CRYSTALLIZATION; HELICAL CONFORMATION; THINNING PROCESSES; NORMAL VIBRATIONS; POLYMERS; FRACTIONS; PHASE;

D O I：

10.1366/000370209789806920

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The melting behavior of low molecular weight poly(ethylene oxide) (PEO) fractions has been studied via generalized two-dimensional infrared (2D-IR) correlation spectroscopy and a new stochastic-pulse-based temperature modulation differential scanning calorimetry (DSC) technique (TOPEM (R)). 2D-IR correlation analysis of the melting of PEO shows that v(s)(CH2) and gamma(a)(CH2) vary prior to v(s)(COC). Moreover, the TOPEM (R) experiments show that reversible melting and crystallization is occurring during the melting of PEO. These suggest that the melting of PEO is possibly a process passing over intermediate states. Based on our results, a model of the melting process of PEO lamellae is presented: the intermediate states containing the distorted helical conformation are formed first at the front of the lamellae during the melting process.

引用

页码：1303 / 1307

页数：5

共 37 条

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