多级回收诱导聚苯乙烯固态微孔发泡的形态转变

IF 1.3 4区 医学 Q4 MATERIALS SCIENCE, BIOMATERIALS Cellular Polymers Pub Date : 2018-09-04 DOI:10.1177/026248931803700302
Indrajeet Singh, A. Gandhi, M. Biswal, S. Mohanty, S. K. Nayak
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引用次数: 11

摘要

本文对通用聚苯乙烯进行了四次再加工。研究了聚苯乙烯重复后处理对其聚合物性能和微孔发泡行为的影响。据观察,后处理导致长聚合物链断裂为短链,从而导致PDI和MFI增加。发现分子量和玻璃化转变温度随着再循环阶段的增加而降低。后处理导致纯聚苯乙烯的粘度急剧下降。本报告对后处理对发泡行为的影响进行了适当分析,发现后处理改善了泡孔尺寸及其分布。在再加工试样的发泡过程中,也观察到对膨胀率的积极影响。发现细胞密度随着回收阶段的增加而降低。研究了饱和压力和发泡温度对微孔泡沫形态的影响以及回收利用情况。研究了发泡时间对泡孔尺寸、泡孔尺寸分布、泡孔密度、膨胀率和泡孔壁厚度的影响。
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Multi-Stage Recycling Induced Morphological Transformations in Solid-State Microcellular Foaming of Polystyrene
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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来源期刊
Cellular Polymers
Cellular Polymers 工程技术-材料科学:生物材料
CiteScore
3.10
自引率
0.00%
发文量
9
审稿时长
3 months
期刊介绍: Cellular Polymers is concerned primarily with the science of foamed materials, the technology and state of the art for processing and fabricating, the engineering techniques and principles of the machines used to produce them economically, and their applications in varied and wide ranging uses where they are making an increasingly valuable contribution. Potential problems for the industry are also covered, including fire performance of materials, CFC-replacement technology, recycling and environmental legislation. Reviews of technical and commercial advances in the manufacturing and application technologies are also included. Cellular Polymers covers these and other related topics and also pays particular attention to the ways in which the science and technology of cellular polymers is being developed throughout the world.
期刊最新文献
The impact performance of density-graded polyurea elastomeric foams CONFERENCES AND SEMINARS ISOPA’s New Role PATENTS ABSTRACTS Experiments and Modelling of the Expansion of Crosslinked Polyethylene Foams
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