Author： Wang J. Banu D. Feldman D.
Publisher： Taylor & Francis Ltd
ISSN： 1568-5616
Source： Journal of Adhesion Science and Technology, Vol.6, Iss.5, 1992-01, pp. : 587-598
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Abstract
Polyblends based on different epoxy pre-polymers, various lignins, and some additives such as fillers or a third polymer were prepared at room temperature and thermally cured. The effects of the different components, such as epoxy pre-polymer, hardener, lignin type, lignin molecular weight, filler, and a third polymer, on the adhesive properties of the polyblends were studied. The adhesive properties of the epoxy-lignin (EP-L) polyblends as determined by shear strength testing (by tension loading) correlated well with the type of lignin (i.e. hardwood or softwood) and lignin molecular weight. A variety of epoxy-hardener systems with lignin (up to 20%, in some cases) resulted in an improvement in their adhesive joint shear strength. The improvements varied from 112% to 178% of the control epoxy for different epoxy-hardener systems. The adhesive joint shear strength of EP-L was not much affected by the addition of 20% by weight of mineral fillers. The presence of a third polymeric component such as poly(vinyl chloride) (PVC) or phenoxy resin had a beneficial effect on the adhesive properties of the EP-L polyblends. This work demonstrates that a wide variety of commercial lignins, epoxy pre-polymers, hardeners, mineral fillers, and third polymeric components can be employed in EP-L polyblends with an improvement in the adhesive properties and a cost advantage.
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