钇化合物对聚丙烯／空心玻璃微珠复合材料性能的影响

采用化学沉积法以六水硝酸钇对空心玻璃微珠的表面进行改性，利用力学性能测试仪、流变仪、差热扫描量热仪、X射线衍射仪等设备评估了该稀土化合物对聚丙烯／空心玻璃微珠复合材料的力学强度、流变性能、结晶性能和晶型结构的影响．实验结果表明：硝酸钇能明显改善复合材料的界面相容性，随着改性液中六水硝酸钇浓度的增加，复合材料的力学强度呈现先增加后降低的趋势，最佳质量分数为0．5％；同时，当复合材料中空心玻璃微珠的填充量为20％时，与空心玻璃微珠未改性相比，改性后复合材料的拉仲强度、冲击强度和结晶温度分别提高了38．5％、33．8％和4．2℃；此外，该改性剂具有成核作用，可促进聚丙烯β型晶的形成．

Effects of Yttrium Compound on Properties of Polypropylene/Hollow Glass Beads Composites

Yttrium trinitrate hexahydrate was used as a surface modifier to treat hollow glass beads via a process of chemical deposition, and the mechanical strength, rheological properties, crystallinity and crystal structure of polypro- pylene/hollow glass beads composites were assessed by the testers for mechanical properties, rheometer, differential scanning calorimeter and X-ray diffractometer, respectively. The experimental results showed that the interfacial com- patibility of the composites was obviously improved after hollow glass beads were modified, and the mechanical prop- erties firstly increased and then decreased with the increase of the mass fraction of this modifier. It was found that the optimum mass fraction of this modifier was 0.5%. Moreover, when the treated beads loading was 20%, the tensile strength, impact strength and the crystallization temperature of the composites were increased by 38.5%, 33.8% and 4.2 ℃, respectively, compared with those of the composites which were blended with other mass fractions of beads. The results also showed that the modifier had nucleating effects on the matrix and promoted the formation of β-crystals of polypropylene.