材料期刊网

以1,3,5,7,9,11,13-苯基-15-乙烯基笼型倍半硅氧烷（乙烯基POSS）与醋酸乙烯酯（VAc）为原料,采用半连续乳液聚合法制备了POSS/PVAc复合材料。采用傅立叶转变红外光谱（FT-IR）、核磁共振（1H-NMR）等表征POSS/PVAc复合材料的结构和组成,利用X射线衍射（XRD）和透射电镜（TEM）研究了POSS分子在POSS/PVAc复合材料中的分散性。POSS/PVAc复合材料的性质以及POSS对复合材料性质的影响是通过热失重分析（TGA）技术和差示扫描量热（DSC）技术来进行研究的。结果表明,加入1%与5%POSS的复合材料Tg分别比纯PVAc高出7℃与15℃,5%的复合材料热分解温度达到324℃,比纯PVAc分别提高70℃。

With 1,3,5,7,9,11,13-heptaphenyl-15-vinyl cage silsesquioxane（vinyl-POSS） and vinyl acetate（VAc） as raw materials,synthesized POSS/PVAc composite materials were synthesized by semi-continuous emulsion polymerization.The structure and composition of POSS/PVAc composites were characterized by Fourier transform infrared spectroscopy（FT-IR）,nuclear magnetic resonance（1H-NMR）.X-ray diffraction（XRD） and transmission electron microscopy（TEM） were applied to study the dispersion of POSS in POSS/PVAc composite material.The results confirm that vinyl-POSS can be successfully incorporated into the PVAc matrix via emulsion polymerization.The thermal properties were investigated by thermal gravimetric analysis（TGA） and differential scanning calorimetry（DSC）.Results show that pure PVAc has a Tg value at 38 ℃ after the POSS molecule is bonded to the chain of PVAc,Tg value of POSS/PVAc composite increases to 45 ℃,48 ℃（POSS content is 1% and 5%） that is much higher than that of the pure PVAc.The decomposition temperatures of POSS/PVAc composite（POSS content is 5%） is 324 ℃ which is 70 ℃ higher than that of the pure PVAc.