Mechanism in Brill transition of polyamide 66 studied by two-dimensional correlation infrared spectroscopy

被引：25

作者：

Luo, Jiang ^{[1
]}

Zhou, Tao ^{[1
]}

Fu, Xiaoliang ^{[1
]}

Liang, Hongwen ^{[2
]}

Zhang, Aiming ^{[1
]}

机构：

[1] Sichuan Univ, Polymer Res Inst, State Key Lab Polymer Mat Engn China, Chengdu 610065, Peoples R China

[2] China Sinopec, Baling Petrochem Ind Co Ltd, Yueyang 414014, Peoples R China

来源：

EUROPEAN POLYMER JOURNAL | 2011年 / 47卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Polyamide; Brill transition; Infrared spectrum; Two-dimensional correlation analysis; FOLDED LAMELLAR CRYSTALS; TEMPERATURE-INDUCED CHANGES; PURE LIQUID-STATE; X-RAY-DIFFRACTION; NYLON 6,6; N-METHYLACETAMIDE; PHASE-TRANSITIONS; STRUCTURAL-CHANGE; BEHAVIOR; POLYMERS;

D O I：

10.1016/j.eurpolymj.2010.11.017

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The Brill transition of polyamide 66 was investigated by temperature-dependent infrared spectroscopy combined with moving-window two-dimensional (MW2D) correlation spectroscopy. The temperature range of the Brill transition determined by MW2D correlation spectroscopy was 90-170 degrees C. We employed generalized 2D correlation spectroscopy to study the sequential order of polyamide 66 chains with linear increment of temperature. The movement of the methylene segments near to NH is earlier than those on the C=O sides. At the same time, the methylene which is close to NH varies before the inner methylene. Three kinds of NH groups in polyamide 66 were found. The sequential order of their motions is as follows. The free hydrogen-bonded NH groups change first, and then the disordered hydrogen-bonded NH groups. Finally, the ordered hydrogen-bonded NH groups start to change. We also found that the changes of the ordered hydrogen-bonded NH groups follow with the methylene groups. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：230 / 237

页数：8

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