Journal
MATERIALS LETTERS
Volume 169, Issue -, Pages 103-106Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2016.01.083
Keywords
Polymers; Phosphors; Epoxy resin; Flame retardancy; Intumescent char; Blowing-out effect
Funding
- NSFC
- Guangdong Provincial Government [U1201243]
- National Natural Science Foundation of China [51173047]
- project for Scientific and Technology of Guangdong Province [2013B010203009]
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A novel phenophosphazine-containing compound, HD-DPPA, was successfully synthesized via the addition reaction between 5,10-dihydro-phenophosphazinine-10-oxide and Schiff base obtained in advance by condensation of 4,4'-dimninodiphenylmethane (DDM) and 4-hydroxybenzaldhehyde, and used as a co-curing agent of DDM and a flame retardant for DGEBA epoxy resin. The cured epoxy resin passed UL 94 V-0 rating with limiting oxygen index (LOI) of 31.3% at only 2.5 wt% HD-DPPA, where phosphorus content was as low as 0.19 wt%. The formation of intumescent char layer and blowing-out effect during combustion are responsible for high flame retardancy of epoxy resin. The flame-retarded epoxy resin exhibited the improved tensile and impact strength compared with the pristine epoxy resin. (C) 2016 Elsevier B.V. All rights reserved.
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