马来酰亚胺功能化硅氧烷树脂

Raef M. Shaltout, D. Loy, D. Wheeler
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引用次数: 4

摘要

聚有机硅氧烷是一类重要的商业化合物。它们表现出许多重要的特性,包括非常低的玻璃化转变温度,使它们在很宽的温度范围内都很有用。在实践中,聚硅氧烷聚合物经常与填充材料混合,以帮助改善其机械性能。增加聚合物机械强度的另一种方法是通过在聚合物主链上掺入某些取代基。碳酸盐和亚胺等硬取代基通常会改善聚硅氧烷的机械性能。本文介绍了用硬马来酰亚胺取代基改性新型聚硅氧烷树脂的制备方法。制备了受保护的乙氧基硅基取代丙基马来酰亚胺。马来酰亚胺取代基被呋喃基保护,单体在水酸性条件下聚合。在高温(>120℃)下,聚合物发生反向Diels-Alder反应,释放foran(式1)。然后,去保护的聚合物可以通过正向Diels-Alder反应选择性交联(在具有两种或多种低官能的共反应物存在下)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Maleimide Functionalized Siloxane Resins
Polyorganosiloxanes are a commercially important class of compounds. They exhibit many important properties, including very low glass transition temperatures, making them useful over a wide temperature range. In practice, the polysiloxane polymer is often mixed with a filler material to help improve its mechanical properties. An alternative method for increasing polymer mechanical strength is through the incorporation of certain substituents on the polymer backbone. Hard substituents such as carbonates and imides generally result in improved mechanical properties of polysiloxanes. In this paper, we present the preparation of novel polysiloxane resins modified with hard maleimide substituents. Protected ethoxysilyl-substituted propyl-maleimides were prepared. The maleimide substituent was protected with a furanyl group and the monomer polymerized under aqueous acidic conditions. At elevated temperatures (>120 C), the polymer undergoes retro Diels-Alder reaction with release of foran (Equation 1). The deprotected polymer can then be selectively crosslinked by a forward Diels-Alder reaction (in the presence of a co-reactant having two or more dime functionalities).
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