Toughening of aromatic diamine‐cured epoxy resins by modification with hybrid modifiers composed of N ‐phenylmaleimide–styrene copolymers and N ‐phenylmaleimide–styrene– p ‐hydroxystyrene terpolymers
1995; Wiley; Volume: 38; Issue: 4 Linguagem: Inglês
10.1002/pi.1995.210380405
ISSN1097-0126
AutoresTakao Iijima, Norio Suzuki, Wakichi Fukuda, Masao Tomoi,
Tópico(s)Photopolymerization techniques and applications
ResumoAbstract Hybrid modifiers composed of N ‐phenylmaleimide–styrene copolymers (PMS), and N ‐phenylmaleimide–styrene– p ‐hydroxystyrene terpolymers (PMSH) containing pendent p ‐hydroxyphenyl groups as functionalities, were used to improve the toughness of bisphenol‐A diglycidyl ether epoxy resin cured with p , p ′‐diaminodiphenyl sulphone. The hybrid modifiers were effective in toughening the epoxy resin. When using the modifier composed of 10 wt% PMS ( M̄ w 313000) and 2.5 wt% PMSH (2.5 mol% p ‐hydroxystyrene units, M̄ w 316000), the fracture toughness ( K IC ) for the modified resins increased 100% with no deterioration in the flexural properties and the glass transition temperature. The improvement in toughness of the epoxy resins was attained because of the co‐continuous phase structure and the improvement in interfacial adhesion. The toughening mechanism is discussed in terms of the morphological characteristics of the modified epoxy resin systems.
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