Fibers are often used to improve the mechanical properties of the polymers. Herein, a facile self-reinforcement method of adding isotactic polypropylene fiber (iPPF) to polypropylene random copolymer (PPR) was developed to enhance its foamability and mechanical properties. Rheological, foaming, crystallization behaviors and mechanical properties of the blends were studied. Elastic modulus, viscous modulus and complex viscosity increase with increasing iPPF content. Due to enhanced viscoelasticity, comparatively uniform PPR-iPPF cells were fabricated. Cell density of PPR-30 iPPF was increased by two orders of magnitude, compared to that of pure PPR, because of the enhanced melt strength and heterogeneous nucleation effects. Compared to solid PPR, the impact strength of foamed PPR-10iPPF was increased by 170%. For both solid and foamed samples, the tensile strength was increased with increasing of iPPF content. However, the tensile strength of the foamed sample is lower than that of solid sample, regardless of the iPPF content.

纤维通常用于改善聚合物的机械性能。在此，开发了一种将等规聚丙烯纤维（iPPF）添加到聚丙烯无规共聚物（PPR）中的简便的自增强方法，以增强其发泡性和机械性能。研究了共混物的流变，发泡，结晶行为和机械性能。弹性模量，粘性模量和复数粘度随iPPF含量的增加而增加。由于增强的粘弹性，制造了相对均匀的PPR-iPPF细胞。与纯PPR相比，PPR-30 iPPF的细胞密度增加了两个数量级，这是因为其熔体强度和异相成核作用得到增强。与固态PPR相比，发泡PPR-10iPPF的冲击强度提高了170％。对于固体和泡沫样品，随着iPPF含量的增加，抗拉强度增加。然而，无论iPPF含量如何，发泡样品的拉伸强度都低于固体样品的拉伸强度。