Journal
COMPOSITES PART B-ENGINEERING
Volume 227, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109392
Keywords
Epoxy resin; Transparency; Flame retardant; Mechanical property
Funding
- State Key Laboratory of Solid Waste Reuse for Building Materials [SWR-2021-002]
- Key laboratory of Processing and Quality Evaluation Technology of Green Plastics of China National Light Industry council [PQETGP2021012]
- Beijing Technology and Business University
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This study successfully prepared EP/BDO composites with excellent comprehensive performance by synthesizing a reactive flame-retardant BDO, which showed significant improvements in flame retardance, mechanical properties, and transparency. The composites also exhibited heat and smoke suppression effects, in addition to enhanced tensile and bending strength compared with neat EP.
It is always a challenge to prepare multifunctional epoxy resins (EP) composites with excellent flame retardance, mechanical property and high transparency. In this work, a reactive flame-retardant (BDO) was synthesized from DOPO, 3,5-diamino-triazolz and thiophene-2-formaldehyde, and taken to prepare EP/BDO composites. Surprisingly, benefitting from the synergy of efficient flame retardant unit (DOPO structure), catalytic curing unit (triazole structure) and optical functional structure (thiophene-2-formaldehyde), the EP composites with excellent comprehensive performance was obtained. In detailed, after adding only 5 wt% BDO, the EP composites passed the UL-94 V-0 level, and the limiting oxygen index was increased to 33% from 22.5% of neat EP. At the same time, EP/BDO-5 showed obvious heat suppression and smoke suppression effects. Besides, EP/BDO-5 presented excellent mechanical strength, that the tensile strength and bending strength were increased by 25% and 30% compared with neat EP. Moreover, EP/BDO composites maintained the same good light transmittance as neat EP, and also presented enhanced Tg and dielectric property. In addition, the dual phase flame-retardant mechanism was revealed through systematically analyzing residues after combustion and the gaseous phase products of flame retardant. The above results indicated EP/BDO composites with excellent comprehensive performance possessed a great potential application in high-performance composites fields.
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