不同介孔结构的SiO_2对PMMA性能的影响  

Effects of Framework Structure on the Properties of SiO_2/ PMMA Hybrids

作　　者：焦剑[1] 汪雷[1] 吕盼盼[1] 崔永红[1] 赵莉珍 

机构地区：[1]西北工业大学理学院应用化学系,西安710129

出　　处：《宇航材料工艺》2014年第6期52-55,共4页Aerospace Materials & Technology

摘　　要：文摘分别采用二维六方孔结构Si O2(SBA-15)和蠕虫状孔结构Si O2(MSU-J)与MMA原位聚合制备介孔Si O2/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Si O2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。Mesoporous silica with two-dimensional （2D） hexagonal framework （SBA-15 ） and worm-hole frame- work （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 me- chanical 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.

关 键 词：介孔二氧化硅 聚甲基丙烯酸甲酯 杂化材料结构 性能 

分 类 号：TB332[一般工业技术—材料科学与工程]