Evaluation of different expansion processes for poly(ethylene-co-vinyl acetate) foam-reinforced with micronized graphite

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Bulletin of Materials Science Pub Date : 2024-11-23 DOI:10.1007/s12034-024-03341-x

Bruna Rossi Fenner, Matheus Vinicius Gregory Zimmermann, Eduardo Junca, Marina Kauling de Almeida, Lara Vasconcellos Ponsoni, Ademir José Zattera, Ruth Marlene Campomanes Santana

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Abstract

Poly(ethylene-co-vinyl acetate) is used in numerous industries due to its versatility and increasing development of reinforced foams with a variety of fillers as well as the method of expansion, impacting the properties of foams. By varying the type and content of the incorporated filler as well as the expansion method, it is possible to obtain different cell morphologies even with low filler content in the polymer matrix. On this basis, this study reports the development of EVA foams reinforced with small amounts of micronized graphite and expanded by two expansion methods, namely thermocompression with chemical blowing agents (CBA) and expansion in an autoclave with CO₂ in supercritical state as physical blowing agent (PBA). The main results show that the presence of a small amount of graphite reduces the density of foam, significantly increases the size of cells, and consequently, reduces the number of cells per unit area. The CBA foams had a lower density than PBA foams; however, the PBA foams exhibited a more homogeneous morphological structure.

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评估用微粉石墨增强聚（乙烯-醋酸乙烯）泡沫的不同膨胀工艺

聚（乙烯-醋酸乙烯酯）因其多功能性而被广泛应用于众多行业，使用各种填料和膨胀方法的增强泡沫的开发也在不断增加，这对泡沫的性能产生了影响。通过改变加入填料的类型和含量以及膨胀方法，即使聚合物基体中的填料含量较低，也能获得不同的细胞形态。在此基础上，本研究报告了使用少量微粉化石墨增强 EVA 泡沫并通过两种膨胀方法（即使用化学发泡剂的热压法（CBA）和使用超临界二氧化碳作为物理发泡剂的高压釜膨胀法（PBA））进行膨胀的发展情况。主要结果表明，少量石墨的存在会降低泡沫的密度，显著增大泡孔的尺寸，从而减少单位面积上的泡孔数量。CBA 泡沫的密度低于 PBA 泡沫，但 PBA 泡沫的形态结构更为均匀。

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来源期刊

Bulletin of Materials Science 工程技术-材料科学：综合

CiteScore

3.40

自引率

5.60%

发文量

209

审稿时长

11.5 months

期刊介绍： The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.