【摘要】 利用多巴胺在固体表面氧化自聚合的特性,通过一种简便易行的方式制备了聚多巴胺表面修饰的纳米二氧化硅改性粒子PD-SiO₂。红外光谱测试表明,聚多巴胺在没有破坏纳米二氧化硅结构的前提下成功黏附其表面。将改性粒子PD-SiO₂与聚丙烯/乙烯-辛烯共聚物（PP/POE）通过熔融共混的方式制备了具有亲水效果的高性能聚丙烯复合材料,并利用红外光谱分析、力学性能、接触角、DSC和扫描电镜（SEM）测试分别研究了复合材料的结构、力学性能、表界面性能、结晶性能和断面形貌。结果表面,PD-SiO₂的加入起到了明显的刚性粒子增强效果,提高了材料的刚性和韧性,提高了PP/POE复合材料的亲水性,降低了PP/POE复合材料的结晶温度,提高了结晶度。更多还原

【Abstract】 The surface modified particle（ PD-SiO₂） of surface modified nano silicon dioxide with polydopamine was prepared by a simple way which made use of the characteristic of the oxidative polymerization of dopamine on the surface of nano silicon dioxide. The infrared spectroscopy results showed that polydopamine adhered to the surface of nano silicon dioxide without damaging the structure of nano silicon dioxide. Furthermore, PD-SiO₂ was mixed into the polypropylene / polyethylene-octene（ PP / POE）composites by melt blending to produce the high-performance hydrophilic polypropylene composite. Besides,with the help of infrared spectroscopy, mechanical testing, contact angle testing, differential scanning calorimetry and scanning electron microscopy,we studied the structure,mechanical property,surface and interface property,crystallization property and fracture morphology of the composites. The results show that PD-SiO₂ improves the rigidity,toughness and hydrophilic property of the PP / POE composites,reduces the crystallization temperature and enhances the crystallinity.更多还原