文献类型：期刊文献

英文题名：Synthesis and properties of rigid polyurethane foams synthesized from modified urea-formaldehyde resin

作者：Zhu, Heng[1];Xu, Shi-ai[1,2]

机构：[1]East China Univ Sci & Technol, Minist Educ, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat,Key Lab Ultrafin, Shanghai 200237, Peoples R China;[2]Qinghai Univ, Sch Chem Engn, Xining 810016, Qinghai, Peoples R China

年份：2019

卷号：202

起止页码：718

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：;EI(收录号：20190406402437);WOS:【SCI-EXPANDED(收录号:WOS:000460847700057)】；

基金：This work was supported by the National Science Foundation of China (No. 51463020), the Foundation from Qinghai Science and Technology Department (2017-HZ-803), Thousand Talents Program of Qinghai Province and Kunlun Scholar Award Program of Qinghai Province.

语种：英文

外文关键词：Rigid polyurethane foam; Flame retardant; Urea formaldehyde resin; Fire behavior

摘要：In this study, ethylene glycol modified urea formaldehyde resin (EUF) was synthesized from urea, paraformaldehyde and ethylene glycol, and then incorporated into rigid polyurethane foams (RPUFs) as a reactive-type liquid flame retardant. The structure of EUF was characterized by Fourier transform infrared spectroscopy, and the thermal degradation properties and fire behaviors of RPUFs were characterized by limiting oxygen index (LOI), cone calorimetry test and thermogravimetry analysis. The results show that the incorporation of EUF results in an increase in the thermal stability and LOl of RPUFs. As the EUF loading increases, the peak heat release rate, total smoke release and CO/CO2 weight ratio of RPUFs decrease significantly. This is because EUF can release non-flammable gases during the initial degradation of polyurethane foams and promote the formation of the compact char layer, which can serve as an effective shield against heat, oxygen and combustible volatiles during the combustion. However, EUF shows negative effect on the cell morphology and mechanical properties of RPUFs. In conclusion, EUF has excellent performance in flame retardancy and smoke suppression for RPUFs. (C) 2019 Elsevier Ltd. All rights reserved.