PP/改性高岭土复合材料性能及微观结构

Properties and Microstructure of PP/Coupled Kaolin Composite

以铝钛复合偶联剂(OL-AT-1618)、钛酸酯偶联剂(NDZ-311)、硬脂酸(StA)为表面改性剂对高岭土(高岭土)进行表面改性。研究表明:PP/改性高岭土复合材料与PP/未改性高岭土复合材料相比,其缺口冲击强度可提高15%,拉伸强度提高7%。扫描电镜照片显示,改性高岭土在PP基体中分散均匀。用广角X射线衍射仪对PP的结晶状况进行表征,发现高岭土的填充量和偶联剂的用量对各衍射峰的位置几乎没有影响,但衍射峰强度略有变化。用差示扫描量热仪对PP的结晶速率进行研究,发现高岭土在较小的过冷度下可诱导PP结晶,使PP的结晶速率有所提高。

AI-Ti complex coupling agent （ OL-AT-1618 ） , titanate coupling agent （ NDZ-311 ） and stearic acid were used as surface modifier to treat kaolin. Coupled kaolin could considerably improve the Izod notched impact strength 15 % and tensile strength 7 % respectively. The morphology of the composite was further studied using scanning electron microscopy. And a finer dispersion of kaolin particles in the PP matrix was observed. The X-ray diffraction and differential scanning calorimetry were used to analyze of crystal property of PP. Rusults showed that content of kaolin and coupling agent had little effect on crystallization behavior of PP in PP/kaolin composite. The heterogeneous nucleation effect of kaolin on PP was observed and the rate of crystallization of PP was improved.