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具有微孔结构和超低密度的聚（醚酰亚胺）/环氧泡沫复合材料：珠粒泡沫制备、压缩成型、力学性能、热稳定性及阻燃性能

Poly(ether imide)/Epoxy Foam Composites with a Microcellular Structure and Ultralow Density: Bead Foam Fabrication, Compression Molding, Mechanical Properties, Thermal Stability, and Flame-Retardant Properties.

作者信息

Jiang Junjie, Feng Weiwei, Zhao Dan, Zhai Wentao

机构信息

School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong Province, China.

University of Chinese Academy of Sciences, Beijing 100049, China.

出版信息

ACS Omega. 2020 Sep 29;5(40):25784-25797. doi: 10.1021/acsomega.0c03072. eCollection 2020 Oct 13.

DOI:10.1021/acsomega.0c03072
PMID:33073103
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7557248/
Abstract

It is challenging to prepare ultralow-density microcellular foams based on high-performance polymers due to their low gas solubility and rigid polymer matrix. In this study, by applying microcellular foaming technology using CO/acetone as the blowing agent, ultralow-density poly(ether imide) (PEI) bead foams with an expansion ratio of 30-56 times and cell density of 10-10 cells/cm were fabricated, resulting from the enhanced plasticization effect of the mixed fluid. The slow diffusivity of acetone at room temperature ensured the saturated PEI beads to foam after desorption for more than 6 days, which potentially reduces the transportation cost of PEI bead foams significantly. A novel compression molding process was developed to prepare the molded PEI bead foams (MPEIs) using epoxy as a coating agent. The good infiltration character of epoxy on bead foams endowed the MPEIs with excellent mechanical properties, together with an ultralow density of 80-200 kg/m, long-term dimensional stability at 160 °C, and excellent flame-retardant properties of V0 rating. These features made the MPEIs very promising for many advanced applications.

摘要

由于高性能聚合物的气体溶解度低且聚合物基体刚性大，制备基于此类聚合物的超低密度微孔泡沫具有挑战性。在本研究中，通过应用以CO/丙酮为发泡剂的微孔发泡技术，制备出了膨胀比为30 - 56倍、泡孔密度为10⁹ - 10¹⁰个/cm³的超低密度聚醚酰亚胺（PEI）珠粒泡沫，这得益于混合流体增强的增塑效果。丙酮在室温下的缓慢扩散率确保了饱和的PEI珠粒在解吸6天以上后发泡，这有可能显著降低PEI珠粒泡沫的运输成本。开发了一种新型压缩成型工艺，以环氧树脂为涂层剂制备成型的PEI珠粒泡沫（MPEIs）。环氧树脂在珠粒泡沫上的良好浸润特性赋予了MPEIs优异的机械性能，同时具有80 - 200 kg/m³的超低密度、在160°C下的长期尺寸稳定性以及V0级优异的阻燃性能。这些特性使得MPEIs在许多先进应用中极具前景。

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本文引用的文献

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Fabrication of three-dimensional polyetherimide bead foams supercritical CO/ethanol co-foaming technology.三维聚醚酰亚胺珠状泡沫材料的制备：超临界CO₂/乙醇共发泡技术
RSC Adv. 2019 Jan 30;9(7):4072-4081. doi: 10.1039/c8ra09706b. eCollection 2019 Jan 25.
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Facile preparation of lightweight microcellular polyetherimide/graphene composite foams for electromagnetic interference shielding.用于电磁干扰屏蔽的轻质微孔聚醚酰亚胺/石墨烯复合泡沫的简易制备。
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ACS Omega. 2022 Aug 5;7(32):28493-28502. doi: 10.1021/acsomega.2c03283. eCollection 2022 Aug 16.