Thermal and surface properties of phenolic nanocomposites containing octaphenol polyhedral oligomeric silsesquioxane
Thermal and surface properties of phenolic nanocomposites containing octaphenol polyhedral oligomeric silsesquioxane
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DOI：
10.1002/marc.200500852
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发表时间：
2006-04-03
影响因子：
4.6
通讯作者：
Chang, FC
中科院分区：
文献类型：
--
作者：
Lin, HC;Kuo, SW;Chang, FC
合成了一种含有8个酚官能团的新型多面体低聚硅氧烷（POSS），并与苯酚和甲醛共聚形成了具有高热稳定性和低表面能的新型酚醛/POSS纳米复合材料。DSC结果表明，随着POSS含量的增加，这些纳米复合材料的玻璃化转变温度开始升高，但当POSS含量超过10 wt.-%时，玻璃化转变温度下降，这可能是因为MALDI-TOF质量分析证明了相对低分子量物质的形成和POSS聚集。我们的TGA分析表明5-wt。随着POSS含量的增加，-%-质量损失温度（T-d）显著增加，这是因为POSS的加入导致纳米复合材料表面形成无机保护层。XPS和接触角数据为LIP的假设提供了积极的证据。此外，接触角测量表明，增加POSS含量后，表面疏水性显著增强。
We have synthesized a new polyhedral oligomeric silsesquioxane (POSS) containing eight phenol functional groups and copolymerized it with phenol and formaldehyde to forrn novolac-type phenolic/POSS nanocomposites exhibiting high thermal stabilities and low surface energies. Our DSC results indicate that the glass transition temperature of these nanocomposites increased initially upon increasing their POSS content, but then decreased at POSS content above 10 wt.-%, presumably because of the formation of relatively low molecular weight species and POSS aggregation as evidenced from MALDI-TOF mass analyses. Our TGA analyses indicated that the 5-wt.-%-mass-loss temperatures (T-d) increased significantly upon increasing the POSS content because the incorporation of the POSS led to the formation of an inorganic protection layer on the nanocomposite's surface. XPS and contact angle data provided positive evidence to back LIP this hypothesis. In addition, contact angle measurements indicated a significant enhancement in surface hydrophobicity after increasing the POSS content.