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Tailored thermal and mechanical properties of epoxy resins prepared using multiply hydrogen‐bonding reactive modifiers
Author(s) -
Liu JeneKu,
Shau ShiMin,
Juang TzongYuan,
Chang ChiaCheng,
Dai Shenghong A.,
Su WenChiung,
Lin ChingHsuan,
Jeng RuJong
Publication year - 2010
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.33445
Subject(s) - epoxy , thermosetting polymer , glass transition , materials science , polymer chemistry , fourier transform infrared spectroscopy , curing (chemistry) , hydrogen bond , thermal decomposition , dynamic mechanical analysis , polymer , monomer , chemical engineering , chemistry , composite material , organic chemistry , molecule , engineering
In this study, we synthesized a phosphorus‐containing triply functionalized reactive modifier, DOPO‐tris(azetidine‐2,4‐dione), and a phosphorus‐free doubly functionalized reactive modifier, bis(azetidine‐2,4‐dione), and embedded them into epoxy resin systems. We characterized these synthesized reactive modifiers using Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, elemental analysis, and mass spectrometry. During the thermosetting processes, we reacted the epoxy curing agents 4,4‐diaminodiphenylmethane and tris(4‐aminophenyl)amine with the multiply hydrogen‐bonding reactive modifiers and epoxy monomers. The introduction of the DOPO segment, strongly hydrogen bonding malonamide linkages, and hard aromatic groups into the backbones of the synthesized reactive modifiers resulted in epoxy networks exhibiting tailorable crosslinking densities, flexibilities, glass transition temperatures, thermal decomposition temperatures, and flame retardancies. Furthermore, dynamic mechanical analyses indicated that intermolecular hydrogen bonding of these reactive modifiers enhanced the thermal and physical properties of their epoxy resins through the formation of unique pseudocrosslinked polymer networks. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011