中文摘要：

采用八环氧多面体低聚倍半硅氧烷（POSS（epoxy）8）和端羧基聚甲基丙烯酸甲酯（PMMA-COOH）的开环反应,运用Graft-onto的方法合成了一种反应性杂化纳米粒子：四环氧多面体低聚倍半硅氧烷-接枝-四聚甲基丙烯酸甲酯（POSS（epoxy）4-g-PMMA4）.通过傅里叶红外光谱仪（FTIR）,示差扫描量热仪（DSC）,热失重分析仪（TGA）,核磁共振波谱仪（^1H-NMR）等对反应性杂化纳米粒子的结构进行了表征,结果表明成功合成了POSS（epoxy）4-g-PMMA4.并将上述合成的反应性杂化纳米粒子应用于聚偏氟乙烯/聚乳酸（PVDF/PLLA）不相容体系的增容,运用万能材料试验机、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对其增容原理和效果进行研究,结果表明POSS（epoxy）4-g-PMMA4可以作为PVDF/PLLA不相容体系的反应性增容剂.

英文摘要：

Compatibilization of immiscible polymer blends using reactive nanoparticles as the compatibilizer is reported. The reactive hybrid nanoparticles, POSS（epoxy）4-g-PMMA4, were synthesized via eight epoxy based octa polyhedral oligomeric-silsesquioxane（POSS（epoxy）8） initiated ring-opening grafting of a carboxyl acid-terminated polymethylmethacrylate（PMMA-COOH）（Mn, side chain = 3850）. The molecular structure of the synthesized POSS（epoxy）4-g-PMMA4 was investigated by Fourier transform infrared spectroscopy（FTIR） spectra, differential scanning calorimetry（DSC）, thermogravimetric analysis（TGA） and nuclear magnetic resonance（1H-NMR）. Both FTIR and NMR results indicated that PMMA oligomers were chemically grafted onto the POSS and four epoxide groups remained on the POSS core. DSC measurement showed that the glass transition temperature（Tg） of the grafted PMMA was lower than that of the PMMA oligomer before grafting. POSS（epoxy）4-g-PMMA4 was then used as the reactive compatibilizer for the immiscible polyvinylidene fluoride/poly（L-lactide）（PVDF/PLLA） blends. The reactive epoxide groups of POSS（epoxy）4-g-PMMA4 reacted with the end COOH groups of PLLA, and the PMMA tails on the POSS（epoxy）4-g-PMMA4 had specific interactions with PVDF molecular chains. It was found that the domain size decreased drastically for the compatibilized blends and the interface adhesion was improved. The Tg of both PVDF and PLLA shifted to each other after the incorporation of the reactive nanoparticles. At the same time, the phase size decreased continuously with increasing the loading of the reactive hybrid nanoparticles. It is therefore considered that the reactive nanoparticles formed a Janus structure located at the interface and took the role as the effective compatabilizer for PVDF and PLLA after reactive blending. Moreover, the compatibilized blends exhibited drastic improvements in the mechanical properties, compared with the uncompatibilized blends. The tensile strength and e