热致液晶聚合物对短玻璃纤维增强聚丙烯加工性、结构与性能的改善

GLASS FIBER-REINFORCED POLYPROPYLENE: PROCESSABILITY, MORPHOLOGY AND MECHANICAL PROPERTIES IMPROVED BY A THERMOTROPIC LIQUID CRYSTALLINE POLYMER

短切玻璃纤维增强的热塑性复合材料具有加工简便,生产周期短,可以反复加工等优点,因此得到了广泛应用。但短切玻璃纤维会给加工成型带来困难,主要在于纤维对加工设备的磨损,以及由于纤维的加入增大了熔体的粘度等。如果提高加工温度来降低粘度又会导致高聚物降解。几年前Kiss和Isayev提出用热致液晶聚合物(TLCP)的刚性棒状分子链作增强剂与被增强基体熔融共混,在加工中TLCP原位形成增强纤维,形成原位复合材料。原位复合材料中由于TLCP的流变性质。

With the addition of a thermotropic liquid crystalline polymer (TLCP), PHB/PET (60/ 40), glass fiber/polypropylene was melt blended and extruded. The decrease of apparent viscosity of melts , the preferred orientation of glass fibers in polypropylene matrix and the enhanced tensile properties of extrudates indicate that processability, structure and properties of glass fiber reinforced polypropylene have been improved by the matched TLCP.