Nano-phase structures and mechanical properties of epoxy/acryl triblock copolymer alloys

Autor:	Yoshihiro Morishita, Hajime Kishi, Jin Imade, Shinya Oshita, Y. Kunimitsu, Mitsunori Asada
Rok vydání:	2011
Předmět:	Toughness Materials science Polymers and Plastics Organic Chemistry Epoxy Acid anhydride Fracture toughness Anionic addition polymerization visual_art Materials Chemistry visual_art.visual_art_medium Copolymer Composite material Curing (chemistry) Living anionic polymerization
Zdroj:	Polymer. 52:760-768
ISSN:	0032-3861
DOI:	10.1016/j.polymer.2010.12.025
Popis:	Phase structures and mechanical properties of epoxy/acryl triblock copolymer alloys using several curing agents were studied. PMMA-b-PnBA-b-PMMA triblock copolymers synthesized by living anionic polymerization were applied as the toughening modifiers for the epoxy resins. An aromatic amine, an acid anhydride and an anionic polymerization catalyst as curing agents resulted in macro-phase separation in the epoxy/triblock copolymer blends during the cure process. However, a phenol novolac as the curing agent created nano-phase structures in the epoxy blends. The size of the spherical phases or cylindrical phases was about 40 nm in diameter, and the main component in the nano-phases was the PnBA of the triblock copolymer. The fracture toughness of the epoxy/triblock copolymer alloys with the nano-cylindrical phases reached 2530 J/m2. The fracture toughness was more than twenty fold relative to the unmodified epoxy resin, and was equivalent to the toughness of polycarbonates.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::278cc812f6391dde4310615a4d35e69f https://doi.org/10.1016/j.polymer.2010.12.025 Zobrazit plný text záznamu Full Text from ScienceDirect