不同介孔结构的SiO2 对PMMA 性能的影响

分别采用二维六方孔结构SiO2(SBA-15) 和蠕虫状孔结构SiO2(MSU-J) 与MMA 原位聚合制备

介孔SiO2 / PMMA 杂化材料。采用XRD、N2 吸附-脱附、SEM、DSC 和TGA 等方法研究了材料的微观结构、力学

性能、热性能和介电性能。结果表明:介孔SiO2 对PMMA 有增强增韧作用,同时也有利于杂化材料热性能和介

电性能的提高。杂化材料的热稳定性和耐热性均高于PMMA,含4wt% 的SBA-15/ PMMA 和7wt% 的MSU-J/

PMMA 杂化材料的介电常数由2. 91 分别降至最低2. 73 和2. 64。

Effects of Framework Structure on the Properties of SiO2 / PMMA Hybrids

Mesoporous silica with two-dimensional (2D) hexagonal framework (SBA-15) and worm-hole framework

(MSU-J) were synthesized with different silica precursors and it was further employed to modify poly( methyl

methacrylate) (PMMA) to form novel SiO2 / PMMA hybrids with lower dielectric constant, higher thermal and mechanical

properties. The structural feature and physical properties of these materials were studied by XRD, SEM,

DSC and TGA. The results manifested that introduction of SiO2 into PMMA exhibited toughening and reinforcing effect

on the hybrid materials. The dielectric constants of the hybrid materials can be reduced from 2. 91 of the pure PMMA

to 2. 73 and 2. 64 by incorporating 4 wt% SBA-15 and 7 wt% MSU-J, respectively.