PP/Nano-TiO_2包覆长石复合材料的制备、性能及结构表征

Preparation, Properties and Structure Characterization of PP/Nano-TiO_2 Coated Feldspar Composites

采用纳米二氧化钛(nano-TiO2)对长石进行表面修饰,并用偶联剂KH570对包覆长石进行改性处理,对其表面包覆形貌、表面成分进行了分析和表征。采用热重(TG)分析、X射线衍射(XRD)分析、差示扫描量热法(DSC)对由改性nano-TiO2包覆长石制备的聚丙烯(PP)/nano-TiO2包覆长石复合材料的性能进行了研究,并用扫描电镜(SEM)观察了其表面形貌。结果表明:当改性长石用量为3%时,复合材料的拉伸强度和断裂伸长率均达到最大值,复合材料的冲击性能随着改性长石用量的增加而提高;其热稳定性和韧性比PP基体有所改善;XRD与DSC分析表明,包覆长石的加入能诱导β晶形成,对PP具有异相成核作用,提高了PP基体的结晶度。

Nano-TiO2 were used to coat the surface of feldspar and modify the composite particle with silane coupling agent KH-570, and the surface morphology and ingredient of the modified feldspar fillers were characterized and analyzed. Polypropylene （PP）/modified feldspar composites were prepared by filling the modified nano-TiO2 coated feldspar in PP, and the mechanical properties, thermogravimetry （TG）, X-ray diffraction （XRD） and differential scanning calorimeter （DSC） of the composites were studied, and the surface morphology of PP/modified feldspar composites were observed by SEM. The results show that the maximum tensile strength and elongation at break of PP/modified feldspar composites are obtained when the modified feldspar content is 3%. The impact strength of the PP/nano-TiO2 coated feldspar composite evidently increases with the increasing content of modified feldspar; Compared with pure PP, the thermalstability and toughness of the PP/nano-TiO2 coated feldspar composites improve. Moreover, XRD and DSC analysis shows that nano-TiO2 coated feldspar induced PP to crystallize into β form and has the heterogeneous nucleation effect on PP, which can improve the crystallinity of PP matrix.