具有低介电常数的CE/POSS-MPS复合材料的结构与性能

Structures and Properties of CE/POSS-MPS Composites with Low Dielectric Constant

由蠕虫型结构的氨基功能化的介孔二氧化硅(AP-MPS)和八环氧基倍半硅氧烷(G-POSS)制备出一种新型杂化的纳米颗粒(POSS-MPS),作为填料加入到氰酸酯树脂(CE)中制备了CE/POSS-MPS复合材料。通过傅里叶变换红外光谱、X射线光电子能谱、N2吸附脱附等方法表征了POSS-MPS的结构,对比分析了CE/MPS及CE/POSS-MPS复合材料的力学性能、介电性能和耐热性能。结果表明,POSS成功接枝到MPS上,对MPS的孔结构进行了部分封闭,且提供了更多的反应性基团。与纯CE相比,MPS和POSS-MPS的引入,均使复合材料的力学性能和玻璃化转变温度(Tg)得到提高,介电常数和介电损耗降低。CE/POSS-MPS复合材料的弯曲强度和弯曲弹性模量总体上略低于CE/MPS复合材料,但其冲击强度比后者有明显的提高。在高填料用量下,CE/POSS-MPS复合材料的介电常数和介电损耗相比于CE/MPS得到有效降低,Tg提高,当POSS-MPS用量为4份时,复合材料的介电常数和介电损耗分别为2.78和0.0079,Tg达到251℃。POSS-MPS的加入使CE的断裂呈韧性断裂,并使其高温下的热分解得到抑制。

A novel hybrid functional nanoparticle （denoted POSS-MPS） was synthesized by the reaction of aminofunctionalized mesoporous silica （AP-MPS） with a wormhole framework structure and glycidyl polyhedral oligomeric silsesquioxane （G-POSS）, and then cyanate ester resin （CE）/POSS-MPS composites were prepared. The structure of POSS-MPS was verified by FTIR, XPS and N2 adsorption-desorption, the mechanical, dielectric and thermal properties of CE / MPS and CE / POSS-MPS composites were compared. The results show that the introduction of POSS indicates a successful post-grafting reaction of--NH2 groups onto MPS, partly envelops the pores of MPS and provides more reactive groups. Compared with the pure CE, the two composites exhibit enhancement in mechanical properties and glass transition temperature （Tg）, have lower dielectric constant （x） and dielectric loss （tanδ）. Although the bending strength and modulus of the CE/POSS-MPS composite are slightly lower than those of the CE/MPS composite in general, its impact strength has more obvious improvement. Moreover, under the high filler content, compared with the CE / MPS, the k and tan8 of the CE / POSS-MPS composite are lower and Tg is higher, and their value is 2.78,0.0079 and 251℃ respectively when POSS-MPS content is 4 phr. With adding POSS-MPS, the composites exhibit ductile fracture, and the thermal degradation is effectively inhibited in the higher temperature region.