Thermal degradation of poly(siloxane-urethane) copolymers

被引：82

作者：

Chuang, Fu-Sheng ^{[1
]}

Tsi, Hung-Yi ^{[1
]}

Chow, Jing-Dong ^{[2
]}

Tsen, Wen-Chin ^{[1
]}

Shu, Yao-Chi ^{[1
]}

Jang, Shin-Cheng ^{[1
,2
]}

机构：

[1] Vanung Univ, Dept Polymer Mat, Tao Yuan 32045, Taiwan

[2] Vanung Univ, Dept Environm Engn, Tao Yuan 32045, Taiwan

来源：

POLYMER DEGRADATION AND STABILITY | 2008年 / 93卷 / 10期

关键词：

Degradation; Siloxane-urethane copolymer; TGA; TG-FTIR;

D O I：

10.1016/j.polymdegradstab.2008.07.029

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 aim of this study was to investigate the characteristics and mechanism of the degradation of poly(siloxane-urethane) (PSiU) copolymers by thermogravimetric analysis (TGA) and TGA coupled with Fourier-transform infra-red spectroscopy (TG-FTIR). The PSiU copolymers consisted of 4,4'-diphenylmethane diisocyanate (MDI), 1,4-butanediol (1,4-BD), and OH-terminated polydimethylsiloxane (PDMS). In TGA they exhibited a two-stage degradation at 250-650 degrees C. The two stages of degradation have been found to comprise eight degradation steps and two interchange reactions, as revealed by TG-FTIR analysis. The main decomposition products have been identified as CO2, tetrahydrofuran, cyclosiloxane, and macrocyclic species. In addition, the effects of hard segment content (HSC) on the degradation and thermal stability of PSiU copolymers have been investigated by means of TG and DTG curves: notably, a stability region at 410-470 degrees C is caused by the cyclosiloxane, as verified by TG-FTIR. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1753 / 1761

页数：9

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