Depczyńska Ewelina, Perdoch Waldemar, Mazela Bartłomiej
Faculty of Forestry and Wood Technology, Poznań University of Life Sciences, 60-637 Poznan, Poland.
Materials (Basel). 2020 Nov 26;13(23):5376. doi: 10.3390/ma13235376.
The subject of this work was to characterize the catalytic course of the linseed oil silylation reaction with vinyltrimethoxysilane (VTMOS), carried out under elevated pressure and temperature conditions, and an explanation of the reasons for rapid gelation of the reaction product. To explain and describe the process, analytical methods were used, i.e., H and C NMR (nuclear magnetic resonance), GC-FID (gas chromatography coupled with flame ionisation detection), and GPC (gel permeation chromatography). Reaction products were monitored after 3, 6 and 12 h. The molar mass of the VTMOS-modified oil in only 3 h was comparable with the molar mass of the product obtained by conventional polymerisation. An increase in the reaction time resulted in further transformations resulting from the hydrolysis and condensation reactions taking place. In contrast to reactivity of soybean oil, the silanisation of linseed oil occurred much faster and without the need for cross-linking catalysts. The reason for the high reactivity of linseed oil to VTMOS and rapid gelation of the resulting product was primarily the amount of double bonds present in linseed oil and their high availability, in particular the double bond in the acid linolenic acid located at the C16 carbon.
这项工作的主题是表征在高压和高温条件下进行的亚麻籽油与乙烯基三甲氧基硅烷（VTMOS）硅烷化反应的催化过程，并解释反应产物快速凝胶化的原因。为了解释和描述该过程，使用了分析方法，即H和C NMR（核磁共振）、GC-FID（气相色谱-火焰离子化检测联用）和GPC（凝胶渗透色谱）。在3、6和12小时后监测反应产物。仅3小时内VTMOS改性油的摩尔质量就与通过常规聚合获得的产物的摩尔质量相当。反应时间的增加导致了由水解和缩合反应发生的进一步转化。与大豆油的反应性相反，亚麻籽油的硅烷化发生得更快，并且不需要交联催化剂。亚麻籽油对VTMOS的高反应性以及所得产物快速凝胶化的原因主要是亚麻籽油中存在的双键数量及其高可用性，特别是位于C16碳上的亚麻酸中的双键。
