Influence of the type of epoxy hardener on the structure and properties of interpenetrated vinyl ester/epoxy resins

被引:33
作者
Gryshchuk, O [1 ]
Karger-Kocsis, J [1 ]
机构
[1] Kaiserslautern Univ Technol, Inst Composite Mat, D-67663 Kaiserslautern, Germany
关键词
atomic force microscopy (AFM); epoxy resin; fracture mechanics; inter-penetrating networks (IPN); structure-property relations; vinyl ester resin;
D O I
10.1002/pola.20371
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The morphology-toughness relationship of vinyl ester/cycloaliphatic epoxy hybrid resins of interpenetrating network (IPN) structures was studied as a function of the epoxy hardening. The epoxy was crosslinked via polyaddition reactions (with aliphatic and cycloaliphatic diamines), cationic homopolymerization (via a boron trifluoride complex), and maleic anhydride. Maleic anhydride worked as a dual-phase crosslinking agent by favoring the formation of a grafted IPN structure between the vinyl ester and epoxy. The type of epoxy hardener strongly affected the IPN morphology and toughness. The toughness was assessed by linear elastic fracture mechanics, which determined the fracture toughness and energy. The more compact the IPN structure was, the lower the fracture energy was of the interpenetrated vinyl ester/epoxy formulations. This resulted in the following toughness ranking: aliphatic diamine > cycloaliphatic diamine greater than or equal to boron trifluoride complex > maleic anhydride. For IPN characterization, the width of the entangling bands and the surface roughness parameters were considered. Their values were deduced from atomic force microscopy scans taken on ion-etched surfaces. More compact, less rough IPN-structured resins possessed lower toughness parameters than less compact, rougher structured ones. The latter were less compatible according to dynamic mechanical thermal and thermogravimetric analyses. (C) 2004 Wiley Periodicals, Inc.
引用
收藏
页码:5471 / 5481
页数:11
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