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首页> 外文期刊>RSC Advances >A stereoregular macrocyclic oligomeric silsesquioxane bearing epoxide groups: synthesis and its nanocomposites with polybenzoxazine
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A stereoregular macrocyclic oligomeric silsesquioxane bearing epoxide groups: synthesis and its nanocomposites with polybenzoxazine

机译：带有环氧基的立构规整的大环低聚倍半硅氧烷：聚苯并恶嗪的合成及其纳米复合材料

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In this contribution, we report the synthesis of cis-hexa[(phenyl)(dimethylsiloxypropylglycidylether) cyclohexasiloxane, a novel macrocyclic oligomeric silsesquioxane (MOSS) via the combination of silylation and hydrosilylation reactions. This stereoregular MOSS macromer bearing epoxide groups was then incorporated into polybenzoxazine (PBZ) thermoset and the organic-inorganic nanocomposites were successfully obtained as evidenced by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Dynamic mechanical thermal analysis (DMTA) showed that the organic-inorganic nanocomposites displayed enhanced glass transition temperatures (T-g's) compared to plain PBZ. Thermogravimetric analysis (TGA) indicates that the organic-inorganic PBZ nanocomposites possessed improved thermal stability. The improved thermomechanical properties are attributable to the nanoreinforcement of the stereoregular macrocyclic silsesquioxanes on PBZ matrix as well as the additional crosslinking between PBZ and the MOSS macromer. The results of static contact angle measurement showed that the surface hydrophobicity of the organic-inorganic nanocomposites was significantly improved compared to the plain PBZ thermoset.
机译：在这项贡献中，我们报告了甲硅烷基化和氢化硅烷化反应相结合的顺式六[（苯基）（二甲基甲硅烷氧基丙基缩水甘油醚）环六硅氧烷的合成，一种新型的大环低聚倍半硅氧烷（MOSS）。然后将这种带有环氧基的立体规则MOSS大分子单体掺入热固性聚苯并恶嗪（PBZ）中，并通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）成功地获得了有机-无机纳米复合材料。动态机械热分析（DMTA）显示，与普通PBZ相比，有机-无机纳米复合材料显示出更高的玻璃化转变温度（T-g's）。热重分析（TGA）表明，有机-无机PBZ纳米复合材料具有改善的热稳定性。改善的热机械性能归因于PBZ基质上的立体规则大环倍半硅氧烷的纳米增强，以及PBZ和MOSS大分子单体之间的额外交联。静态接触角测量结果表明，与普通PBZ热固性材料相比，有机-无机纳米复合材料的表面疏水性得到了显着改善。

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