材料科学
阻燃剂
锥形量热计
热重分析
可燃性
差示扫描量热法
环氧树脂
玻璃化转变
热分解
热固性聚合物
氧化膦
燃烧
复合材料
化学工程
高分子化学
有机化学
聚合物
烧焦
化学
磷化氢
催化作用
物理
工程类
热力学
作者
Alexander Battig,Patrick Müller,Annabelle Bertin,Bernhard Schartel
标识
DOI:10.1002/mame.202000731
摘要
Abstract A rigid aromatic phosphorus‐containing hyperbranched flame retardant structure is synthesized from 10‐(2,5‐dihydroxyphenyl)‐10H‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO‐HQ), tris(4‐hydroxyphenyl)phosphine oxide (THPPO), and 1,4‐terephthaloyl chloride (TPC). The resulting poly‐(DOPO‐HQ/THPPO‐terephthalate) (PDTT) is implemented as a flame retardant into an epoxy resin (EP) at a 10 wt% loading. The effects on EP are compared with those of the monomer DOPO‐HQ and triphenylphosphine oxide (OPPh 3 ) as low molar mass flame retardants. The glass transition temperature, thermal decomposition, flammability (reaction to small flame), and burning behavior of the thermosets are investigated using differential scanning calorimetry, thermogravimetric analysis, pyrolysis combustion flow calorimetry, UL 94‐burning chamber testing, and cone calorimeter measurements. Although P‐contents are low at only 0.6 wt%, the study aims not at attaining V‐0, but at presenting a proof of principle: Epoxy resinswith PDTT show promising fire performance, exhibiting a 25% reduction in total heat evolved (THE), a 30% reduction in peak heat release rate (PHRR) due to flame inhibition (21% reduction in effective heat of combustion (EHC)), and an increase in T g at the same time. This study indicates that rigid aromatic hyperbranched polymeric structures offer a promising route toward multifunctional flame retardancy.
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