私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

Three kinds of hybrids with different architectures including dumbbell-type, bead-type, and cross-linked structure, were prepared via the Heck reaction between octavinyl-polyhedral oligomeric silsesquioxane (OV-POSS) and different bromo-substituted aromatic amide monomers. The molecular architecture can be successfully achieved by simply varying the feed ratio of OV-POSS to monomers. Their structure and properties were characterized by FTIR, 1H NMR, 29Si NMR, provide the expansion for FTIR and NMR] All the POSS-based hybrids exhibited good thermal stability and low dielectric constant properties. The relationship between chemical structure, molecular architecture, and the dielectric constant of these hybrids were investigated in detail. The results show that POSS content dominated the low dielectric constant of the hybrids, while the chemical structure of organic chains and molecular architecture also play an important role on the formation of low dielectric constant.