酸酐化聚砜对聚砜/液晶聚合物共混物的界面增容作用

首先合成了马来酸酐接枝改性聚砜.改性后聚砜材料的表面张力增大,其中的极性分量增加明显,并以此增容聚砜/液晶聚合物(VectraB950)为原位复合体系,研究了增容前后共混物的加工流变行为和界面性能.结果表明,酸酐化聚砜可增强聚砜与液晶聚合物之间的界面作用,引起共混物加工粘度的上升;漫反射FTIR研究表明,增容后共混体系中的特殊相互作用增大;XPS和PLM的研究表明,在熔融加工过程中改性聚砜与液晶聚合物组分之间存在一定的界面化学反应,并生成了接枝共聚物.共混物相容性的提高应归结于相间化学反应与物理作用共同作用的结果.

The Interfacial Compatibilization for PSF/LCP Blends by a Maleic Anhydride Modified Polysulfone

Maleic anhydride grafted polysulfone(PSF g MAH) was prepared. Compared to polysulfone, the surface tension and its polar fraction of PSF g MAH were increased by modification. The PSF g MAH was used to compatibilize polysulfone(PSF)/liquid crystalline polymer(LCP) blends. The processabilities and the interfacial properties of PSF/LCP blends before and after compatilization were investigated. It was found that the melt viscosities were increased by the addition of PSF g MAH. DRS FTIR investigations showed that the special interaction between PSF and LCP phases was increased due to the incorporation of PSF g MAH. The XPS and PLM studies revealed that some chemical reactions had occurred between mPSF and LCP phases, which produced PSF VB copolymers. It is suggested that the compatibility is attributed to some interactions including both chemical and physical ones. A model to illustrate the compatibilization of mPSF in PSF/VB blends has been proposed.