Dispersion of graphene nanoplatelets in poly(vinyl acetate) latex and effect on adhesive bond strength
作者： Artur M Pinto , Jorge Martins , J. Agostinho Moreira , Adélio M. Mendes , Fernão D. Magalhães
DOI: 10.1002/PI.4379
关键词:
摘要: Graphene nanoplatelets (GNPs) were directly dispersed in poly(vinyl acetate) (PVAc) latex concentrations from 0.05 up to 2 wt% (based on dry weight), without using additional surfactants or dispersants. Stable dispersions obtained due interaction of the GNPs with protective colloids (poly(vinyl alcohol) and hydroxyethylcellulose) originally present latex. This caused an increase viscosity accentuated pseudoplastic behavior latex, as evidenced by rheological measurements. Cryo-SEM imaging showed that individual aqueous phase. The equilibrium contact angle for water PVAc films increased 13 ◦ upon incorporation 0.1 nanofiller hydrophobicity. However, this was lower higher loadings, probably occurrence GNP agglomeration. Bond strength measurements performed automated bonding evaluation system setup veneer lap joints more than 50% shear only – 0.3 GNPs. At loadings bond decreased, indicating less efficient dispersion polymer matrix. Raman spectroscopy analysis confirmed agglomeration significant at loadings. c � 2013 Society Chemical Industry
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