Epoxy resins were modified with 10-(2,5-dihydroxyl phenyl)-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and 1,1′-(methylenedi-4,1-phenylene) bismaleimide (BDM). The resulting blends were then cured with 4, 4′-diaminodiphenyl sulfone. Thermal properties of the cured epoxy resins were investigated by differential scanning calorimetry and thermogravimetric analysis. Flame retardancy of the cured epoxy resins was checked by limiting oxygen index test, UL-94 vertical burning test, and cone calorimeter test. The char residue after cone calorimeter test was investigated by scanning electron microscopy/energy-dispersive X-ray analyses. The results indicated that the cured resins exhibited high glass transition temperature and excellent flame-retardant properties. BDM promoted the carbonization property of phosphorus-containing epoxy resin and facilitated the formation of cross-linked char layer with compact and continuous structure, thus enhancing the flame-retardant properties.
WangXSongLXingW. A effective flame retardant for epoxy resins based on poly(DOPO substituted dihydroxyl phenyl pentaerythritol diphosphonate). Mater Chem Phys2011; 125: 536–541.
2.
ZangLWagnerSCiesielskiM. Novel star-shaped and hyperbranched phosphorus-containing flame retardants in epoxy resins. Polym Adv Technol2011; 22: 1182–1191.
3.
WangXHuYSongL. Flame retardancy and thermal degradation mechanism of epoxy resin composites based on a DOPO substituted organophosphorus oligomer. Polymer2010; 51: 2435–2445.
4.
WangXZhangQ. Synthesis, characterization, and cure properties of phosphorus-containing epoxy resins for flame retardance. Eur Polym J2004; 40: 385–395.
5.
LiuHXuKAiH. Preparation and characterization of phosphorus-containing Mannich-type bases as curing agents for epoxy resin. Polym Adv Technol2009; 20: 753–758.
RenHSunJWuB. Synthesis and properties of a phosphorus-containing flame retardant epoxy resin based on bis-phenoxy (3-hydroxy) phenyl phosphine oxide. Polym Degrad Stab2007; 92: 956–961.
8.
ZhangWLiXYangR. Blowing-out effect in epoxy composites flame retarded by DOPO-POSS and its correlation with amide curing agents. Polym Degrad Stab2012; 97: 1314–1324.
9.
ZhangWLiXJiangY. Investigations of epoxy resins flame-retarded by phenyl silsesquioxanes of cage and ladder structures. Polym Degrad Stab2013; 98: 246–254.
10.
ChenXJiaoCLiS. Flame retardant epoxy resins from bisphenol-A epoxy cured with hyperbranched polyphosphate ester. J Polym Res2011; 18: 2229–2237.
11.
ToldyAAnnaPCsontosI. Intrinsically flame retardant epoxy resin—fire performance and background—part I. Polym Degrad Stab2007; 92: 2223–2230.
12.
LiXOuYShiY. Combustion behavior and thermal degradation properties of epoxy resins with a curing agent containing a caged bicyclic phosphate. Polym Degrad Stab2002; 77: 383–390.
13.
DengJShiW. Synthesis and effect of hyperbranched (3-hydroxyphenyl) phosphate as a curing agent on the thermal and combustion behaviours of novolac epoxy resin. Eur Polym J2004; 40: 1137–1143.
14.
SunDYaoY. Synthesis of three novel phosphorus-containing flame retardants and their application in epoxy resins. Polym Degrad Stab2011; 96: 1720–1724.
15.
LiangBCaoJHongX. Synthesis and properties of a novel phosphorous-containing flame-retardant hardener for epoxy resin. J Appl Polym Sci2013; 128: 2759–2765.
16.
LiuWVarleyRJSimonGP. Phosphorus-containing diamine for flame retardancy of high functionality epoxy resins. Part II. The thermal and mechanical properties of mixed amine systems. Polymer2006; 47: 2091–2098.
17.
WangXHuYSongL. Synthesis and characterization of a DOPO-substituted organophosphorus oligomer and its application in flame retardant epoxy resins. Prog Org Coatings2011; 71: 72–82.
18.
WangCSLinCH. Synthesis and properties of phosphorus-containing epoxy resins by novel method. J Polym Sci Pol Chem1999; 37: 3903–3909.
19.
WangCSLinCH. Synthesis and properties of phosphorus containing advanced epoxy resins. J Appl Polym Sci2000; 75: 429–436.
20.
LinCHWangCS. Synthesis and property of phosphorus-containing bismaleimide by a novel method. J Polym Sci Pol Chem2000; 38: 2260–2268.
21.
WangYZhaoJYuanY. Synthesis of maleimido-substituted aromatic s-triazine and its application in flame-retarded epoxy resins. Polym Degrad Stab2014; 99: 27–34.
22.
XiaXXiongYZhangX. Synthesis and characterization of epoxy film cured with phosphorous-containing phenolic resin. J Appl Polym Sci2007; 104: 3813–3817.
ChiangTHLiuCYDaiCY. A study of the thermal, dielectric, and flame-retarding characteristics of various bismaleimide blended with halogen-free epoxy resin. J Polym Res2013; 20: 274–283.
25.
ShauMTsaiPTengW. Novel bismaleimide containing cyclic phosphine oxide and an epoxy unit: synthesis, characterization, thermal and flame properties. Eur Polym J2006; 42: 1899–1907.
26.
WangHWangQHuangZ. Synthesis and thermal degradation behaviors of hyperbranched polyphosphate. Polym Degrad Stab2007; 92: 1788–1794.
27.
ZhaoWLiBXuM. Synthesis of a phenylene phenyl phosphine oligomer and its flame retardancy for polycarbonate. J Appl Polym Sci2013; 127: 2855–2866.
