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Polymerization of organoalkoxysilanes: Kinetics of the polycondensation progress and the effect of solvent properties and salts addition
Chemical Physics ( IF 2.3 ) Pub Date : 2019-12-03 , DOI: 10.1016/j.chemphys.2019.110642
Ahmed A. Issa , Marwa El-Azazy , Adriaan S. Luyt

The kinetics and the produced oligomer patterns of organoalkoxysilanes (AS) were investigated under different conditions by using gas chromatography (GC), because the degree of the polymerization and the siloxane conformations have an effect on the polymer applications GC peaks were assigned to AS monomers and oligomers by using a mass detector. The pattern of the produced oligomers depended on the catalysts, time, and the solvent, while the kinetics of hydrolysis, re-esterification, condensation, and progress depended on the solvent and type of catalyst. The methoxy and hydrolyzed monomers of trimethylethoxysilane (TMES) were in equilibrium in alkaline and fluorinated media, while the monomers were completely converted to dimers in acidic media. An investigation of the effect of solvent properties (e.g. dielectric constant and viscosity) on the hydrolysis reaction revealed that there was no change in the polarity of the activated complex during spontaneous hydrolysis, and that the reaction was not diffusion controlled.



中文翻译:

有机烷氧基硅烷的聚合:缩聚反应的动力学以及溶剂性质和盐添加的影响

通过使用气相色谱(GC)在不同条件下研究了有机烷氧基硅烷(AS)的动力学和生成的低聚物模式,因为聚合度和硅氧烷构象对聚合物的应用有影响,GC峰被指定为AS单体和寡聚体通过使用质量检测器。产生的低聚物的类型取决于催化剂,时间和溶剂,而水解,再酯化,缩合和进行的动力学取决于溶剂和催化剂的类型。三甲基乙氧基硅烷(TMES)的甲氧基和水解单体在碱性和氟化介质中处于平衡状态,而单体在酸性介质中则完全转化为二聚体。研究溶剂性质的影响(例如

更新日期:2019-12-03
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