Nanostructures and surface dewettability of epoxy thermosets containing hepta(3,3,3-trifluoropropyl) polyhedral oligomeric silsesquioxane-capped poly(ethylene oxide).
Nanostructures and surface dewettability of epoxy thermosets containing hepta(3,3,3-trifluoropropyl) polyhedral oligomeric silsesquioxane-capped poly(ethylene oxide).
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DOI：
10.1021/jp075891c
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发表时间：
2007-11
期刊：
影响因子：
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通讯作者：
K. Zeng;Sixun Zheng
中科院分区：
文献类型：
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作者：
K. Zeng;Sixun Zheng
通过七（3，3，3-三氟丙基）硅倍半氧烷与端烯丙基聚环氧乙烷（PEO）的硅氢加成反应，合成了七（3，3，3-三氟丙基）笼型倍半硅氧烷（POSS）封端的PEO。POSS封端的PEO通过傅里叶变换红外（FTIR）和核磁共振（NMR）光谱进行了表征。将有机-无机两亲物引入环氧树脂中，制备了有机-无机纳米结构热固性复合材料。用场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）对杂化复合材料的形貌进行了表征。纳米结构的形成是基于固化反应前后有机-无机两亲物与环氧树脂的亚组分（即POSS和PEO链）的相容性和相行为来解决的。静态接触角的测量表明，有机-无机纳米复合材料的表面疏水性显着增强，以及表面自由能降低。原子力显微镜（AFM）的结果表明，有显着的POSS部分在热固性材料的表面迁移。通过X射线光电子能谱（XPS）分析表明，POSS基团在纳米结构热固性材料表面的富集是其表面性能提高的主要原因。
Hepta(3,3,3-trifluoropropyl) polyhedral oligomeric silsesquioxane (POSS)-capped poly(ethylene oxide) (PEO) was synthesized via the reaction of hydrosilylation between hepta(3,3,3-trifluoropropyl)hydrosilsesquioxane and allyl-terminated PEO. The POSS-capped PEO was characterized by means of Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopy. The organic-inorganic amphiphile was incorporated into epoxy resin to prepare the organic-inorganic nanostructured thermosetting composites. The morphology of the hybrid composites was characterized with field emission scanning electronic microscopy (FESEM) and transmission electronic microscopy (TEM). The formation of nanostructures was addressed on the basis of miscibility and phase behavior of the sub-components (viz. POSS and PEO chains) of the organic-inorganic amphiphile with epoxy after and before curing reaction. The static contact angle measurements indicate that the organic-inorganic nanocomposites displayed a significant enhancement in surface hydrophobicity as well as reduction in surface free energy. The atomic force microscopy (AFM) showed that there is significant migration of the POSS moiety at the surface of the thermosets. The improvement in surface properties was ascribed to the enrichment of the POSS moiety on the surface of the nanostructured thermosets, which was evidenced by X-ray photoelectron spectroscopy (XPS).