Self-assembled benzoxazine-bridged polysilsesquioxanes exhibiting ultralow-dielectric constants and yellow-light photoluminescent emission
作者:Hung-Cheng Liu、Wen-Chiung Su、Ying-Ling Liu
DOI:10.1039/c1jm10815h
日期:——
A benzoxazine-bridged bis(triethoxysilane) compound (Bz-BES) has been prepared using bisphenol-A, paraformaldehyde, and 3-aminopropyltriethoxysilane as precursors. Characterization of Bz-BES has been conducted with Fourier transform infrared, nuclear magnetic resonance, molecular mass, and elemental analysis. Thermally cured polybenzoxazine-bridged polysilsesquioxane (PBz-BPSSQ) was obtained via the sol–gel and thermal treatment process of Bz-BES. PBz-BPSSQ shows a layer-by-layer lamellar structure composed of polybenzoxazine-rich and polysilsesquioxane-rich layers in the thickness of about 80–100 nm, resulting in its ultra-low dielectric constant of about 1.57 at 1 MHz. PBz-BPSSQ also displays a high glass transition temperature of about 295 °C and a Young's modulus of about 3.1 GPa, both are attributed to its highly cross-linked structure. Moreover, PBz-BPSSQ exhibits yellow-light photoluminescent emission at about 540 nm under excitation at 365 nm.
以双酚 A、多聚甲醛和 3-氨基丙基三乙氧基硅烷为前体,制备了一种苯并恶嗪桥接双(三乙氧基硅烷)化合物(Bz-BES)。通过傅立叶变换红外光谱、核磁共振、分子质量和元素分析对 Bz-BES 进行了表征。通过 Bz-BES 的溶胶-凝胶和热处理工艺,获得了热固化聚苯并恶嗪桥联聚硅氧烷(PBz-BPSSQ)。PBz-BPSSQ 由富含聚苯并恶嗪层和富含聚硅氧烷层的层状结构组成,厚度约为 80-100 nm,因此在 1 MHz 频率下具有约 1.57 的超低介电常数。PBz-BPSSQ 还具有约 295 °C 的高玻璃化转变温度和约 3.1 GPa 的杨氏模量,这都归功于其高度交联的结构。此外,在 365 纳米波长的激发下,PBz-BPSSQ 在约 540 纳米波长处发出黄色光。