Structural study on water-induced phase transitions of poly(ethylene imine) as viewed from the simultaneous measurements of wide-angle X-ray diffractions and DSC thermograms

被引：12

作者：

Hashida, Tomoko ^{[1
]}

Tashiro, Kohji ^{[1
]}

机构：

[1] Toyota Technol Inst, Dept Future Ind Oriented Basic Sci & Mat, Nagoya, Aichi 4688511, Japan

来源：

MACROMOLECULAR SYMPOSIA | 2006年 / 242卷

关键词：

hydrate; phase transition; poly(ethylene imine); thermodynamic;

D O I：

10.1002/masy.200651036

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Thermal behavior of poly(ethylene imine) [PEI] has been studied using simultaneous WAXD/DSC measurement system. PEI exhibits water-induced and thermally-induced phase transitions among four kinds of crystalline hydrates: anhydrate (El/water=1/0), hemihydrate (1/0.5), sesquihydrate (1/1.5), and dihydrate (1/2). The chain conformation changes from a double helix in the anhydrate to a planar zigzag form in the three hydrates. The anhydrate melts at 60 degrees C while the hydrates melt differently in the temperature region Of 70-110 degrees C. By means of the simultaneous WAXD/DSC measurements, complex DSC thermograms of PEI hydrates were characterized on the basis of X-ray diffractions obtained concurrently.

引用

页码：262 / 267

页数：6

共 4 条

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