辐射接枝制备有机-无机纳米杂化粒子及其分散性能

Preparation of organic-inorganic hybrid nanoparticles by radiation induced grafting and their dispersion in a polymer matrix

本文采用共辐射接枝技术,在室温真空氛围中利用γ射线引发一步制备聚偏氟乙烯(PVDF)接枝改性的钛酸钡(BT)有机-无机纳米杂化粒子。通过傅里叶变换红外光谱(FTIR)、热失重分析仪(TGA)以及透射电子显微镜(TEM)对产物进行分析,证明了PVDF成功接枝在钛酸钡纳米粒子表面。利用差示扫描量热仪(DSC)与X射线衍射仪(XRD)对纳米粒子的结晶性进行表征,发现与纯PVDF的晶型不同,钛酸钡表面接枝的PVDF为β晶型。同时,研究了接枝改性的钛酸钡纳米粒子在PVDF基体中的分散行为及其对基体机械性能的影响。结果表明:相较于纯钛酸钡纳米粒子,表面PVDF改性的钛酸钡在PVDF基体中分散更均匀,这主要是由于钛酸钡表面接枝的PVDF链与基体PVDF有良好的缠结作用,能在一定程度上提高纳米粒子与基体的相容性,从而提高钛酸钡/PVDF纳米复合物的机械性能。

Organic-inorganic hybrid nanoparticles were successfully prepared by grafting polyvinylidene fluoride(PVDF)onto barium titanate(BT)nanoparticles(F-BT)by the co-irradiation technique at room temperature under vacuum.The results of Fourier transform infrared(FTIR),thermogravimetric analysis(TGA),and transmission electron microscopy(TEM)demonstrated that PVDF was covalently grafted onto the BT surface.The crystallization behavior of F-BT was investigated by differential scanning calorimetry(DSC),which revealed that the crystalline phase of PVDF on the BT surface was theβphase,while there is no indication of the presence of anαphase.The prepared F-BT nanoparticles were then dispersed in the PVDF matrix to obtain the nanocomposites.Compared to pristine BT,F-BT showed better dispersion in the PVDF matrix and enhanced mechanical properties of the nanocomposites.This can be attributed to the grafted tails on the F-BT,which had specific interactions with PVDF molecular chains.