Organic/inorganic hybrid epoxy nanocomposites from aminophenylsilsesquioxanes
Organic/inorganic hybrid epoxy nanocomposites from aminophenylsilsesquioxanes
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DOI：
10.1021/ma030309d
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发表时间：
2004-01-13
期刊：
影响因子：
5.5
通讯作者：
Laine, RM
中科院分区：
文献类型：
--
作者：
Choi, J;Kim, SG;Laine, RM
以八（氨基苯基）倍半硅氧烷（OAPS）、聚（氨基苯基）倍半硅氧烷（PAPS）、八（二甲基丙基缩水甘油醚）倍半硅氧烷（OG）、双酚A二缩水甘油醚（DGEBA）和二氨基二苯基甲烷（DDM）为原料，制备了环氧官能化的立方体纳米复合材料。利用GPC、FTIR、Si-29 NMR、TGA和DMA对性能进行了系统的比较。在这些研究中，我们发现（1）与芳香族组分的系绳增加焦炭产率和分解温度，（2）立方体负载是重要的热稳定性，（3）芳香族系绳结构，短的长度和高交联密度减少系绳链段松弛运动，这反过来又使网络和最小化宏观玻璃化转变。最后，由OAPS和PAPS制备的纳米复合材料表现出几乎相同的热机械性能，PAPS提供了OAPS的低成本替代品。
Selected epoxy-functionalized cube nanocomposites were prepared from octa(aminophenyl)silsesquioxane (OAPS), poly(aminophenyl)silsesquioxane (PAPS), octa(dimethylsiloxypropylglycidyI ether) silsesquioxane (OG), diglycidyl ether of bisphenol A (DGEBA) and diaminodiphenylmethane (DDM). A systematic comparison of properties was conducted using GPC, FTIR, Si-29 NMR, TGA, and DMA. In these studies, we find that (1) tethers with aromatic components increase char yields and decomposition temperatures, (2) cube loadings are important in thermal stabilities, (3) aromatic tether structure, short lengths and high cross-link densities reduce tether segmental relaxation motions which in turn stiffen the network and minimize macroscopic glass transitions. Finally, nanocomposites prepared from OAPS and PAPS exhibit nearly identical thermomechanical properties with PAPS offering a low cost alternative to OAPS.