Graphene/montmorillonite hybrid synergistically reinforced polyimide composite aerogels with enhanced flame-retardant performance

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• 作者：Lizeng Zuo^a ; Wei Fan^b ; ^{weifan@dhu.edu.cn} ; Youfang Zhang^a ; Longsheng Zhang^a ; Wei Gao^a ; Yunpeng Huang^a ; Tianxi Liu^a ; ^b ; ^{txliu@fudan.edu.cn} ; ^{txliu@dhu.edu.cn}
• 关键词：Polymer-matrix composites (PMCs) ; Hybrid composites ; Thermal properties ; Aerogel
• 刊名：Composites Science and Technology
• 出版年：2017
• 出版时间：8 February 2017
• 年：2017
• 卷：139
• 期：Complete
• 页码：57-63
• 全文大小：2293 K
• 卷排序：139

文摘

Polyimide (PI) composite aerogels with enhanced flame-retardant performance have been fabricated with the addition of environmentally friendly flame-retardant additives (i.e. graphene (G) and montmorillonite (MMT)) via an eco-friendly freeze-drying method followed by a thermal imidization process. Through the strong interaction between the two components, graphene oxide/MMT hybrid can be synergistically dispersed in water, providing good dispersibility in PI matrix, thus endowing the composite aerogels with enhanced mechanical, thermal and flame-retardant properties. As a result, the obtained optimal PI/G/M aerogel exhibits a high compression modulus of up to 14.0 MPa, as well as a specific modulus as high as 155.5 MPa cm3 g−1. Furthermore, with the incorporation of G/MMT hybrids, the decomposition temperature at 10% weigh loss of PI/G/MMT aerogels is 574.3 °C, which is 20 °C higher than that of neat PI aerogels. Moreover, the PI/G/M aerogels exhibit enhanced flame retardant performance with the limiting oxygen index (LOI) value up to 55. Therefore, the G/MMT hybrids synergistically reinforced PI composite aerogels show great potential as high-performance flame-retardant materials.