Journal ArticleDOI
Relationship between cell morphology and impact strength of microcellular foamed high‐density polyethylene/polypropylene blends
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In this paper, the effects of microcellular batch processing conditions (foaming time and temperature) and HDPE/PP blend compositions on the cell morphology (the average cell size and cell-population density) and impact strength were studied.Abstract:
Polymer blends, such as those resulting from recycling postconsumer plastics, often have poor mechanical properties. Microcellular foams have been shown to have the potential to improve properties, and permit higher-value uses of mixed polymer streams. In this study, the effects of microcellular batch processing conditions (foaming time and temperature) and HDPE/PP blend compositions on the cell morphology (the average cell size and cell-population density) and impact strength were studied. Optical microscopy was used to investigate the miscibility and crystalline morphology of the HDPE/PP blends. Pure HDPE and PP did not foam well at any processing conditions. Blending facilitated the formation of microcellular structures in polyolefins because of the poorly bonded interfaces of immiscible HDPE/PP blends, which favored cell nucleation. The experimental results indicated that well-developed microcellular structures are produced in HDPE/PP blends at ratios of 50:50 and 30:70. The cell morphology had a strong relationship with the impact strength of foamed samples. Improvement in impact strength was associated with well-developed microcellular morphology. Polym. Eng. Sci. 44:1551–1560, 2004. © 2004 Society of Plastics Engineers.read more
Citations
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References
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Journal ArticleDOI
Spherulitic Crystallization in Polypropylene
F. J. Padden,H. D. Keith +1 more
TL;DR: A survey of spherulites formed by the isothermal crystallization of polypropylene from the melt in the temperature range 110°−148°C is given in this paper. But their structural morphology, optical properties, melting behavior, and growth rates have not been examined.
Journal ArticleDOI
Supermolecular structure of isotactic polypropylene
TL;DR: In this article, the crystalline structure, spherulitic crystallization and melting behavior of isotactic polypropylene (iPP) is comprehensively reviewed, illustrated and discussed.
Journal ArticleDOI
Effect of the crystallinity and morphology on the microcellular foam structure of semicrystalline polymers
TL;DR: In this paper, the effects of the crystallinity and morphology of semicrystalline polymers on the microcellular foam processing and on the cellular structure of products are investigated, and the experimental results agree with theoretical predictions.
Journal ArticleDOI
Cell morphology and property relationships of microcellular foamed pvc/wood‐fiber composites
TL;DR: In this article, microcellular foamed wood-fiber composites with unique cell morphology and material composition are characterized, and the results indicate that tensile and impact properties of these composites are most sensitive to changes in the cell morphology.
Journal ArticleDOI
Processing and characterization of microcellular foamed high-density polythylene/isotactic polypropylene blends
TL;DR: In this article, a study on batch processing and characterization of microcellular foamed high-density polyethylene (HDPE/iPP) blends is reported, where blends of HDPE and iPP were used to produce materials with variety of crystalline and phase morphologies to enhance the subsequent microcellularity foaming.