Thermoplastic molding compositions and articles comprise immiscible thermoplastic polymer components and reinforcing fibers. The immiscible thermoplastic polymer components and the fibers are blended together under high shear conditions. The molding composition generally contains at least two phases and has an extremely smooth and fiber-free surface. Generally, other very good physical properties are obtained such as high heat distortion temperatures, high tensile modulus, high flex modulus, and the like are also very good. A desired blend of thermoplastic components is thermoplastic polyurethane and modified polyethylene terephthalate with glass fibers. The molded polyethylene terephthalate copolyester blended with an immiscible thermoplastic polymer, preferably modified polyurethane, and glass fibers produces thermoplastic molding compositions and articles having surprisingly superior impact strength. In addition, if the thermoplastic polyurethane is modified by an aromatic polyester polyol, and blended with a modified polyethylene terephthalate, no fibers are necessary to produce compositions having greatly improved processability.
热塑性模塑组合物和制品包括不相溶的热塑性聚合物成分和增强纤维。不相溶的热塑性聚合物成分和纤维在高剪切条件下混合在一起。成型组合物一般至少包含两相,表面极其光滑且不含纤维。一般来说,还能获得其他非常好的物理性能,如高热变形温度、高拉伸模量、高弯曲模量等。一种理想的热塑性成分混合物是带有
玻璃纤维的热塑性聚
氨酯和改性聚
对苯二甲酸乙二醇酯。模塑聚
对苯二甲酸乙二醇酯共聚物与不相溶的热塑性聚合物(最好是改性聚
氨酯)和
玻璃纤维混合,可制成热塑性模塑组合物和制品,其冲击强度出奇地优异。此外,如果用芳香族聚酯多元醇对热塑性聚
氨酯进行改性,并与改性聚
对苯二甲酸乙二醇酯混合,则无需使用纤维即可生产出加工性能大大提高的组合物。