凹凸棒土改性聚丙烯复合材料的性能研究

Study on Properties of Attapulgite Modified Polypropylene Composites

凹凸棒土(ATT)为天然具有刚性的无机填料,由于其自身的棒状晶体结构及高比表面积和纳米粒径的沸石孔道,具有不可媲美的填充性能,可充当聚合物复合材料的填充剂。通过熔融共混法用ATT来增强改性聚丙烯(PP)。研究了ATT的含量对PP复合材料机械性能、热性能和晶体结构的影响。结果表明:加入适量的ATT以同时提高改性聚丙烯的机械性能和热性能,但添加过量会使聚丙烯复合材料的热性质及机械性质下降。X射线衍射结果显示提纯后的ATT的特征峰更加明显且峰面积更大,表明大部分杂质已经被去除。在添加纯化后的ATT后并没有改变PP的晶体结构,适宜的添加量还可以提高复合材料的结晶度。聚丙烯基复合材料已成为一种新型材料,在汽车、包装和建筑方面将会获得更多应用。

Attapulgite(ATT)is a naturally rigid inorganic filler.Due to its rod-like crystal structure and zeolite pore with high specific surface area and nano-size,ATT can be used as a filler for polymer composites.Modified polypropylene(PP)was enhanced with ATT by melt blending.The effects of ATT content on the mechanical properties,thermal properties and crystal structure of PP composites were studied.The results showed that the mechanical and thermal properties of modified polypropylene were improved by adding ATT at the same time,but the thermal and mechanical properties of polypropylene composites were decreased by adding too much ATT.X-ray diffraction results show that the characteristic peaks of purified ATT are more obvious and the peak area is larger,indicating that most impurities have been removed.The crystal structure of PP was not changed after the addition of purified ATT,and the crystallinity of the composite could be improved with the appropriate addition amount.Polypropylene matrix composite has become a new kind of material,and will be used more in automobile,packaging and construction.