挤压
材料科学
反应挤出
发泡剂
均苯四甲酸二酐
扩展器
背景(考古学)
流变学
聚合物
复合材料
发泡剂
化学工程
多孔性
聚氨酯
古生物学
工程类
生物
图层(电子)
聚酰亚胺
作者
Luciano Di Maio,Ivano Coccorullo,Simona Montesano,Loredana Incarnato
标识
DOI:10.1002/masy.200551017
摘要
Abstract In this work industrial scraps of poly(ethylene terephthalate) (PET) were used for the production of foamed sheets. The process was performed by making use of a chemical blowing agent (CBA) in the extrusion process. Due to the low intrinsic viscosity of the recycled PET (IV=0.48dl/g), a chain extender was also used in order to increase the molecular weight of the polymer matrix. Pyromellitic dianhydride (PMDA) and Hydrocerol CT 534 were chosen as chain extender and CBA, respectively. The reactive extrusion and foaming were performed in a two step process, analyzing the feasibility regarding an eventual use in an industrial context. Rheological characterization was carried out on PET samples previously treated with PMDA, as well as the morphological study was performed to define the cellular structure of the foams produced. Moreover, in order to correlate the working conditions in the reactive and the foaming processes with the final morphology of the foams, a mathematical modelling of the foaming process was applied.
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