Preparation, mechanical and thermal properties of polydimethylsiloxane coating for synthetic leathers

IF 2.3 4区 材料科学 Q2 Chemistry
Zhe Sun, Jiating Wen, Jinping Guan, Haojun Fan, Jian Fang, Yi Chen, Wenkai Wang, Qiang Gao
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引用次数: 1

Abstract

The curing process of polydimethylsiloxane (PDMS) coating was systematically investigated by nonisothermal differential scanning calorimeter (DSC), and accordingly, the thermodynamic as well as kinetic parameters were obtained. Meanwhile, effect of structural factors, including different divinyl-terminated polydimethylsiloxane (ViPDMSVi), divinyl-terminated polymethylvinylsiloxane (ViPMVSVi), polymethylhydrosiloxane (PMHS), and reinforcing filler content, on mechanical and thermal properties of coating was studied. The results demonstrated that platinum compounds could significantly accelerate the hydrosilylation and reduce the curing temperature and activation energy. The viscosity, vinyl/hydrogen sites, and quantities of ViPDMSVi, ViPMVSVi, and PMHS were important factors to influence mechanical and thermal properties. Low viscosity ViPDMSVi and PMHS with side hydrogen atoms could increase crosslinking density, and then enhance the tensile strength and heat resistance. ViPMVSVi with higher viscosity and vinyl content could dramatically improve tensile strength while maintaining breaking elongation. Reinforcing filler was another vital factor to enhance strength and thermostability. 550% improvement in tensile strength occurred when reinforcing filler content was 40 wt%. All aforementioned results provided a comprehensive guidance for the preparation and property regulation of PDMS coating. This kind of PDMS coating can be applied in synthetic leather manufacturing.

Graphical abstract

合成皮革用聚二甲基硅氧烷涂层的制备、机械性能和热性能
采用非等温差示扫描量热仪(DSC)对聚二甲基硅氧烷(PDMS)涂层的固化过程进行了系统的研究,得到了固化过程的热力学和动力学参数。同时,研究了不同端部二乙烯基聚二甲基硅氧烷(ViPDMSVi)、端部二乙烯基聚甲基硅氧烷(ViPMVSVi)、聚甲基氢硅氧烷(PMHS)、补强填料含量等结构因素对涂层力学性能和热性能的影响。结果表明,铂类化合物能显著加速硅氢化反应,降低固化温度和活化能。ViPDMSVi、ViPMVSVi和PMHS的粘度、乙烯基/氢位和数量是影响机械和热性能的重要因素。含有侧氢原子的低粘度ViPDMSVi和PMHS可以提高交联密度,从而提高拉伸强度和耐热性。具有较高粘度和乙烯基含量的ViPMVSVi可以在保持断裂伸长率的同时显著提高抗拉强度。补强填料是提高强度和热稳定性的另一个重要因素。当补强填料含量为40%时,抗拉强度提高了550%。上述结果为PDMS涂层的制备和性能调控提供了全面的指导。该涂料可用于合成革生产。图形抽象
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
4.40
自引率
8.70%
发文量
0
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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