Recycling and Reprocessing of Waste Materials from the Production of Polyurethanes

Gorban, Tatyana; Журавлев, В. А.; Onorina, L. E.; Kozhinova, T. V.; Rakk, I. A.

doi:10.1177/0307174x0202900211

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“…Recycling of plastic waste and waste plastic foam is a major focus point of scientists and researchers now a day. Many researchers focused their research works recycling polyurethane waste and converting it tin to useful products [11–13]. Polypropylene has many applications due to its low cost, converting of polypropylene waste in to foam using extruder has been reported [14].…”

Section: Introductionmentioning

confidence: 99%

Multi-Stage Recycling Induced Morphological Transformations in Solid-State Microcellular Foaming of Polystyrene

et al. 2018

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In this article, the general-purpose polystyrene was reprocessed four times. The effect of repeated reprocessing of polystyrene on its polymeric properties and on its microcellular, foaming behaviour were investigated. It was observed that reprocessing leads to break of long polymeric chains into short chains, which resulted increment in PDI and MFI. Molecular weight and Glass transition temperature were found to decrease with increasing recycling stages. Reprocessing resulted abruptly decrement in viscosity of neat polystyrene. Effect of reprocessing on foaming behaviour was analysed properly in this report and it was found that reprocessing resulted in improvement in cell sizes and their distribution. A positive effect on expansion ratio was also observed during foaming of reprocessed specimens. Cell density was found to decrease with increasing recycling stages. The effect of saturation pressure and foaming temperature on microcellular foam morphology along with recycling were investigated. Effect of foaming time on cell size, cell size distribution, cell density, expansion ratio and cell wall thickness was investigated.

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