Synergistic effect and mechanism of platinum catalyst and nitrogen-containing silane on the thermal stability of silicone rubber

被引：42

作者：

Chen, Wanjuan ^{[1
]}

Zeng, Xingrong ^{[1
]}

Lai, Xuejun ^{[1
]}

Li, Hongqiang ^{[1
]}

Fang, Weizhen ^{[1
]}

Liu, Tian ^{[1
]}

机构：

[1] S China Univ Technol, Coll Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China

来源：

THERMOCHIMICA ACTA | 2016年 / 632卷

基金：

美国国家科学基金会;

关键词：

Silicone rubber; Platinum catalyst; Nitrogen-containing silane; TG-FTIR; Thermal stability; Degradation mechanism; CROSS-LINKING; DEGRADATION;

D O I：

10.1016/j.tca.2016.03.008

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Platinum (Pt) catalyst and nitrogen-containing silane (NS) were introduced to improve the thermal stability of silicone rubber. The effects of Pt and NS on thermal stability and degradation mechanism of silicone rubber were investigated by thermogravimetry (TG), thermogravimetry-Fourier transform infrared spectrometry (TG-FTIR), scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDXS) and Fourier transform infrared spectrometry (FTIR). A significant synergism was found between Pt and NS for improving the thermal stability of silicone rubber. When 6.67 ppm of Pt and 1.4 phr of NS were introduced, the temperature of 10% and 20% weight loss under nitrogen atmosphere were respectively increased by 36 degrees C and 119 degrees C. Meanwhile, the residue weight at 900 degrees C was doubled to 68% in the presence of Pt/NS. The synergistic mechanism might be that the nitrogen atom coordinated with Pt and improved the catalytic efficiency of Pt. Additionally, NS preserved the catalytic activity of Pt under air atmosphere. Hence, Pt/NS efficiently catalyzed thermal crosslinking and suppressed degradation of silicone chains. Moreover, it revealed that the presence of Pt/NS protected silicone chains from oxidation. Thus, the unzipping depolymerization by silanol groups was reduced significantly. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：1 / 9

页数：9

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