The flame retardant properties and mechanism of the composites based on DOPS and triazine-trione groups in epoxy resin

阻燃剂 极限氧指数 可燃性 锥形量热计 烧焦 材料科学 环氧树脂 三嗪 硼酸 复合材料 硫化物 高分子化学 核化学 化学工程 燃烧 有机化学 化学 冶金 工程类
作者
Yuzhao Qi,Zeming Hou,Songjiang Xu,Qiu Xu,Xuanying Huan,Dongmei Bao,Daohai Zhang,Guoyong Zhou,Yupeng Zhang,Fang Tan
出处
期刊:Polymer Degradation and Stability [Elsevier BV]
卷期号:216: 110482-110482 被引量:16
标识
DOI:10.1016/j.polymdegradstab.2023.110482
摘要

To reduce the risk of fire due to the flammability of epoxy resins (EP), the use of low-cost, non-toxic raw materials for the synthesis of efficient flame retardants is becoming an important research direction in the field of flame retardant technology. This research with tris (2-hydroxyethyl) isocyanurate (THEIC), maleic anhydride (MAH) and 9,10-dihydro-9-oxa-10- phospha-phenanthrene-10-sulfide (DOPS) as raw materials, through esterification reaction successfully synthesised a novel structure of DOPS-triazine-trione flame retardant tris (3-(9,10-dihydro-9-oxa-10-phospha-phenant hrene-10-sulfide)-butanedioic acid monoethyl ester-based) triazine-trione (DOPS-THEIC) and apply it to EP to prepare EP/DOPS-THEIC. The results demonstrate that the incorporation of 12.5 wt% DOPS-THEIC in EP leads to a significant increase in the Limiting Oxygen Index (LOI) value, reaching 32.8 %, which corresponds to achieving a UL-94 V-0 rating. Moreover, the CONE test revealed notable reductions in the peak heat release rate (PHRR), total heat release (THR), and mass loss rate (MLR) values by 74.1 %, 32.4 %, and 52.6 %, respectively, compared to pure EP. These findings indicate that the addition of DOPS-THEIC effectively suppresses the heat release during combustion, attributed to the formation of a char layer that minimizes mass loss and acts as an improved flame retardant in the condensed phase. Furthermore, as the DOPS-THEIC content increased, the EP composites exhibited remarkable retention of their excellent mechanical properties. This observation reinforces the promising potential of DOPS-THEIC as an effective flame retardant for enhancing the fire resistance of EP materials.
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