KOH催化劑之純化及其在矽氧烷高分子合成之應用

The purification of potassium hydroxide catalyst and its application in the synthesis of polydimethylsiloxane

謝啟發(Chi-Fa Hsieh)

指導教授 ： 陳玉惠 ； 劉泰康

中原大學/理學院/化學研究所/碩士(2002年)

https://doi.org/10.6840/cycu200200254

摘要

本研究使用octamethylcyclotetrasiloxane(D4)、1,3-divinyltetramethyldisiloxane(DVTMDS)及純化之KOH催化劑為原料，經由環寡矽氧烷陰離子聚合反應(anionic polymerization of cyclic siloxane)，合成乙烯基端聚二甲基矽氧烷高分子(vinyl terminated polydimethylsiloxane)。本研究製備三種不同處理方式的KOH催化劑並將其應用在D4陰離子開環聚合反應。
結果顯示合成乙烯基端聚二甲基矽氧烷高分子，係以KOH原料溶於乙醇經150oC、18小時處理後之精製KOH(K2催化劑)最具效率。
K2催化劑受水氣的影響較其它二種催化劑小，所用中和劑與KOH之比例為15:1(wt. %)時可獲得最小揮發份產品。此外，亦利用DSC、TGA、IR、GPC、NMR、水份計、黏度計等儀器，對合成之高分子進行各種相關物性測試與分析。

關鍵字

純化 ； 氫氧化鉀 ； 合成 ； 矽氧烷高分子

並列摘要

In this study we synthesized vinyl-terminated polydimethylsiloxane (PDMS) via anionic polymerization of cyclic siloxane by using the refined potassium hydroxide as catalyst. Row materials used were octamethylcyclotetrasiloxane (D4), 1,3-divinyltetramethyl disiloxane (DVTMDS) and potassium hydroxide catalyst. The purpose of the present study is to prepare three kinds of potassium hydroxide catalyst using different treatment methods. The applications of these catalysts on the anion induced ring-opening polymerization of D4 were investigated.
It was found that the most efficient catalyst for synthesis of vinyl-terminated PDMS was the K2 catalyst, which was obtained by dissolving crude KOH in absolute ethanol and heated to 150oC for 18hours to give the refined KOH.
Besides, moisture undertake was smaller for the K2 catalyst than the other two types of catalyst. For the polymerization least volatile product content was obtained when the potassium hydroxide/neutralizer weight ratio was 1:15. The polymers obtained were identified and analyzed by DSC, TGA, FTIR, GPC, NMR spectroscopies, moisture analyzer, and viscosity meter.

並列關鍵字

purification ； potassium hydroxde ； synthesis ； polydimethysiloxane

參考文獻

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