Toughening of cyanate ester resin by N-phenylmaleimide-N-(p-hydroxy)phenylmaleimide-styrene terpolymers and their hybrid modifiers

Citation
T. Iijima et al., Toughening of cyanate ester resin by N-phenylmaleimide-N-(p-hydroxy)phenylmaleimide-styrene terpolymers and their hybrid modifiers, POLYM INT, 50(3), 2001, pp. 290-302
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER INTERNATIONAL
ISSN journal
0959-8103 → ACNP
Volume
50
Issue
3
Year of publication
2001
Pages
290 - 302
Database
ISI
SICI code
0959-8103(200103)50:3<290:TOCERB>2.0.ZU;2-Z
Abstract
N-Phenylmaleimide-N-(p-hydroxy) phenylmaleimide-styrene terpolymer (HPMS), carrying reactive p-hydroxyphenyl groups, was prepared and used to improve the toughness of cyanate ester resins. Hybrid modifiers composed of N-pheny lmaleimide-styrene copolymer (PMS) and HPMS were also examined for further improvement in toughness. Balanced properties of the modified resins were o btained by using the hybrid modifiers. The morphology of the modified resin s depends on HPMS structure, molecular weight and content, and hybrid modif ier compositions. The most effective modification of the cyanate ester resi n was attained because of the co-continuous phase structure of the modified resin. Inclusion of the modifier composed of 10 wt% PMS (M-w 136000 g mol( -1)) and 2.5 wt% HPMS (hydroxyphenyl unit 3 mol%, M-w 15 500 g mol(-1)) led to 135% increase in the fracture toughness (K-IC) for the modified resin w ith a slight loss of flexural strength and retention of flexural modulus an d glass transition temperature, compared with the values for the unmodified resin. Furthermore, the effect of the curing conditions on the mechanical and thermal properties of the modified resins was examined. The toughening mechanism is discussed in terms of the morphological and dynamic viscoelast ic behaviour of the modified cyanate ester resin system. (C) 2001 Society o f Chemical Industry.