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Synthesis and properties of a novel phosphorous‐containing flame‐retardant hardener for epoxy resin
Author(s) -
Liang Bing,
Cao Jun,
Hong XiaoDong,
Wang ChangSong
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.38445
Subject(s) - limiting oxygen index , fire retardant , epoxy , materials science , char , phosphinate , ultimate tensile strength , curing (chemistry) , thermogravimetric analysis , thermal stability , ammonium polyphosphate , composite material , polymer chemistry , pyrolysis , chemistry , organic chemistry
An aryl phosphinate dianhydride 1,4‐bis(phthalic anhydride‐4‐carbonyl)‐2‐(6‐oxido‐6H‐dibenz[c,e][1,2]‐oxaphosphorin‐6‐yl)‐phenylene ester (BPAODOPE) was synthesized and its structure was identified by FTIR and 1 H‐NMR. BPAODOPE was used as hardener and flame retardant for preparing halogen‐free flame‐retarded epoxy resins when coupled with another curing agent. Thermal stability, morphologies of char layer, flame resistance and mechanical properties of flame‐retarded epoxy resins were investigated by thermogravimetric analysis, SEM, limiting oxygen index (LOI), UL‐94 test, tensile, and charpy impact test. The results showed that the novel BPAODOPE had a better flame resistance, the flame resistance and char yield of flame‐retarded epoxy resins increased with an increase of phosphorus content, tensile strength and impact strength of samples gradually decreased with the addition of BPAODOPE. The flame‐retarded sample with phosphorus contents of 1.75% showed best combination properties, LOI value was 29.3, and the vertical burning test reached UL‐94 V‐0 level, tensile strength and impact strength were 30.78 MPa and 3.53 kJ/m 2 , respectively. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013