POSS/PMMA纳米复合材料的制备及性能研究

摘要

The POSS/PMMA nanocomposites with cross-linked structure were prepared from octa-vinyl polyhedral oligomeric silsesquioxane (POSS) via in situ polymerization,and the FT-IR,DSC and other methods were used to characterize the structure and properties of the nanocomposites.The results show that the POSS/PMMA nanocomposites we have prepared have the cross-linked structure.The addition of POSS can significantly improve the dielectric properties and thermal properties of the nanocomposites,but the thermal properties of POSS/PMMA nanocomposites decrease with increasing content of POSS at high content. When the OV-POSS content is 0.6%,the dielectric constant is reduced from 2.91 to 2.77,and the dielectric loss is reduced from 0.0088 to 0.0039,the Tg of nanocomposites increases with increasing content of POSS.%采用八乙烯基倍半硅氧烷（OV-POSS）通过原位聚合法制备了具有交联网状结构的POSS/PMMA纳米复合材料。通过FT-IR、DSC等方法对纳米复合材料的结构和性能进行了表征。结果表明，通过原位聚合法制备的POSS/PMMA纳米复合材料具有交联网状结构，POSS的引入能明显改善材料介电性能和热学性能，但当OV-POSS含量较高时，热学性能有所下降。当POSS的用量为0.6%时，POSS/PMMA纳米复合材料的介电常数从2.91降低至2.77，介电损耗从0.0088降低至0.0039，复合材料的Tg也上升了。