Interfacial and wetting properties between glass fiber and epoxy resins with different pot lifes

Publication date: 5 May 2018 Source:Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 544 Author(s): Pyeong-Su Shin, Yeong-Min Baek, Jong-Hyun Kim, Ha-Seung Park, Dong-Jun Kwon, Jung-Hoon Lee, Min-Young Kim, K. Lawrence DeVries, Joung-Man Park Considerable research has been devoted to the study of interfacial adhesion, optimal wetting and interfacial properties of composites. In these studies, epoxy hardeners with different pot lifes were used for the manufacture of composites and their molding processes. Wettability and micromechanical testing revealed that these factors effected wetting, interfacial and mechanical properties. FT-IR studies revealed differences in the spectra with different 'C–N type' curing additives contained in the four different amine-type hardeners. For measurement of impregnation rate, a droplet of the different epoxy/hardener liquids was placed on glass fiber mat and the spreading behavior was measured as a function of time. The surface tension on PTFE was measured using the pendant drop method and the work of adhesion calculated for this surface tension was related to the spreading distance. The Drzal equation, based on the single fiber fragmentation test, was implemented to calculate the interfacial shear strength (IFSS) of the different composite materials. To relate the IFSS, the surface tension and the work of adhesion, static contact angle measurements were made using four solvents of known surface energy. A g...
Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research