含功能化氧化石墨烯的硬质聚氨酯泡沫的热降解及阻燃机理

Thermal Degradation and Flame Retardant Mechanism of the Rigid Polyurethane Foam Including Functionalized Graphene Oxide.

作者信息

Chen Xuexi, Li Junfei, Gao Ming

机构信息

School of Safety Engineering, North China Institute of Science and Technology, Box 206, Yanjiao, Beijing 101601, China.

School of Environmental Engineering, North China Institute of Science and Technology, Box 206, Yanjiao, Beijing 101601, China.

出版信息

Polymers (Basel). 2019 Jan 6;11(1):78. doi: 10.3390/polym11010078.

DOI:10.3390/polym11010078

PMID:30960062

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6402230/

Abstract

A flame retardant rigid polyurethane foam (RPUF) system containing functionalized graphene oxide (fGO), expandable graphite (EG), and dimethyl methyl phosphonate (DMMP) was prepared and investigated. The results show that the limiting oxygen index (LOI) of the flame-retardant-polyurethane-fGO (FRPU/fGO) composites reached 28.1% and UL-94 V-0 rating by adding only 0.25 g fGO. The thermal degradation of FRPU samples was studied using thermogravimetric analysis (TG) and the Fourier transform infrared (FT-IR) analysis. The activation energies () for the main stage of thermal degradation were obtained using the Kissinger equation. It was found that the fGO can considerably increase the thermal stability and decrease the flammability of RPUF. Additionally, the of FRPU/fGO reached 191 kJ·mol, which was 61 kJ·mol higher than that of the pure RPUF (130 kJ·mol). Moreover, scanning electron microscopy (SEM) results showed that fGO strengthened the compactness and the strength of the "vermicular" intumescent char layer improved the insulation capability of the char layer to gas and heat.

摘要

制备并研究了一种包含功能化氧化石墨烯（fGO）、可膨胀石墨（EG）和甲基膦酸二甲酯（DMMP）的阻燃硬质聚氨酯泡沫（RPUF）体系。结果表明，仅添加0.25 g fGO，阻燃聚氨酯-fGO（FRPU/fGO）复合材料的极限氧指数（LOI）就达到了28.1%，并通过了UL-94 V-0等级测试。采用热重分析（TG）和傅里叶变换红外（FT-IR）分析研究了FRPU样品的热降解过程。利用基辛格方程获得了热降解主要阶段的活化能（）。结果发现，fGO可以显著提高RPUF的热稳定性并降低其可燃性。此外，FRPU/fGO的活化能达到191 kJ·mol，比纯RPUF（130 kJ·mol）高61 kJ·mol。而且，扫描电子显微镜（SEM）结果表明，fGO增强了“蠕虫状”膨胀炭层的致密性和强度，提高了炭层对气体和热量的隔热能力。