Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 379, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.120793
Keywords
Hyperbranched compounds; Flame retardant; Epoxy composite; Fire safety; Transparency
Categories
Funding
- National Natural Science Foundation of China [51603025]
- Opening Fund of State Key Laboratory of Fire Science [HZ2019-KF11]
- National Key Research and Development Program of China [2018YFC0807900]
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In this study, a novel hyperbranched phosphorus/nitrogen-containing flame retardant (HPNFR) was facilely synthesized via the transesterification reaction of dimethyl methylphosphonate and tris (2-hydroxyethyl) isocyanurate and characterized successfully by H-1 NMR and FTIR. The sample with 4 wt% HPNFR can achieve V-0 rating in UL-94 test and possess a LOI value as high as 34.5%. Conspicuous blowing-out effect was observed during the vertical burning test. TG results indicated that the presence of HPNFR significantly improved the thermal stability of EP thermosets. From cone test, THR, p-HRR, p-SPR and TSP values of HPNFR/EP composites were decreased in comparison to those of pure EP, revealing the reduced fire hazard of EP composites with HPNFR. SEM images of EP thermoset with 4 wt% of HPNFR after cone test exhibited compact and continuous char layers, while those of pure EP are fragmentary and broken. From TG-IR test, the yield of toxic CO and other pyrolysis products was significantly reduced, indicating a decrease in toxicity. Phosphorus-containing compounds were detected in gas phase, which verified the gaseous phase flame retardant effect of HPNFR. Besides, HPNFR would not significantly damage the transparence of EP thermosets, consequently reserved it's application value in some special fields.
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