极限氧指数
材料科学
聚氨酯
烧焦
阻燃剂
可燃性
极限抗拉强度
热稳定性
复合材料
热重分析
化学工程
弹性体
硅醇
燃烧
有机化学
化学
催化作用
工程类
作者
Jin Wang,Shiyu Zhou,Qingxiang Yang,Bicheng Yang,Qiang Zhang,Yamei Lin,Guo‐ping Lu
标识
DOI:10.1002/slct.202302496
摘要
Abstract Polyurethane elastomers (PUEs) serve a vital role in our daily life and various industrial applications, but their flammability has been proven to be a significant drawback. In this work, we have successfully fabricated two modified gallic acids (GAP and GAN) by simple esterification, both of which are effective flame retardants and cross‐linkers for PUEs. According to thermogravimetric analysis (TGA) and limiting oxygen index (LOI) tests, the introduction of GAP and GAN conspicuously improves the char yield (4.9~5.8 wt.%) and LOI value of PUEs (33~35 %). The cone calorimetry tests suggest that the peak heat release rate (PHRR) and total heat release (THR) of PUE decrease significantly, while the fire performance index (FPI) value increase after GAP or GAN modification. Both GAP and GAN enhance the density and strength of carbon residues, and inhibit the generation of combustible volatile gas during the combustion process, thereby improving the fire safety of PUEs. In addition, both GAP and GAN contain multiple benzene rings and hydrogen bonding, which can improve the cross‐linking density of PUEs to enhance their mechanical properties (the elongation at break: 844~951 %; tensile strength: 6.37~8.13 MPa).
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