Microcellular foaming and mechanical properties of iPPF reinforced PPR composites

Zuo, Kailong; Xu, J.L.; Xie, Shouping; Zhang, Shixun; Hou, Junji; Yang, Yang; Zhang, Xiaoli

doi:10.1016/j.supflu.2020.105161

Cited by 8 publications

(1 citation statement)

References 60 publications

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“…Compared with conventional injection molded products, this drawback hinders the widespread application of MIM in heavy-duty components. 9,10 Aimed at the deterioration of mechanical properties of foamed products, Zuo et al 11 added isotactic polypropylene fibers (iPPF) into PP random copolymer to enhance mechanical properties, the result showed that the tensile strength increased with the increase of iPPF content. Wen et al 12 explored the impact of aramid fiber (AF) content on mechanical properties of ethylene-propylene-diene monomer (EPDM) microcellular foam materials.…”

Section: Introductionmentioning

confidence: 99%

Crystallinity and mechanical properties of polypropylene products foamed by microcellular injection molding process

Yu,

Song,

Gao

et al. 2024

J of Applied Polymer Sci

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Microcellular injection molding (MIM) is a pivotal technique for lightweight molding. Polypropylene (PP) is widely used in MIM due to light weight and easy processing. The crystallinity of foamed PP products influences the load‐bearing structures and consequently mechanical properties. To address the deterioration of mechanical properties caused by internal porous structure, a novel method is proposed to regulate the crystallinity by optimizing process parameters, thereby improving mechanical properties. Wide‐angle x‐ray diffraction, mechanical testing, and melt flow simulation are applied to investigate the influence of process parameters on crystallinity and mechanical properties. Parameters are further optimized by establishing a multivariate nonlinear regression model for process parameters and crystallinity. The results show that increasing melt temperature, injection rate, mold temperature, and cooling time stimulate crystallization, enhancing strength and decreasing elongation at break. Conversely, high injection ratio of supercritical fluid obstructs crystallization, reducing strength, and increasing elongation at break. The crystallinity increases by 20.81%; the corresponding tensile, flexural, and shear strength and corresponding modulus increases by 5.39% and 10.28%, 7.60% and 18.50%, 5.00% and 11.37%, and elongation at break decreased by 5.19% through the optimization of regression model. The proposed method is feasible to upgrade the mechanical properties of foamed PP products.

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