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Adhesion and Viscoelestisity of EVA Hot Melt Adhesive

Bank, Mohammad Mahdi | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40166 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Frounchi, Masuod; Dadbin, Susan
  7. Abstract:
  8. A series of poly(ethylene-co-vinyl acetate) (EVA)-based hot melt adhesives containing either a raw rosin or a hydrogenated rosin ester have been prepared to investigate variation of viscosity, softening point and peel adhesion with composition. Adhesion of the prepared hot melt adhesive to the substrate was characterized by T-peel strength test. Increasing rosin had a prominent effect on the adhesion. Viscosity decreased and softening point increased as the wax content increased. Addition of zinc borate as a flame retardant decreased T-peel energy and increased the viscosity and softening point of the samples. Higher peeling strength accompanied with a good softening point and viscosity values obtained with a delicate balance of the tackifier and wax content in the hot melt adhesive composition. EVA based hot melt adhesives formulated with four main components: EVA as the base polymer; hydrogenated rosin ester or raw resin as tackifier; wax as property modifier and zinc borate as a flame retardant. The peeling strength of formulated hot melt adhesives was comparable with commercially available products. The compatibility of the tackifier with the base polymer had an important role in better adhesion. Hot melt adhesive with required properties obtained with an appropriate balance of constituents proportions. Hydrogenated rosin ester instead of raw rosin caused a rapid increase in the peeling energy due to the fact that EVA and hydrogenated rosin have similar ester functionality, which may give better compatibility between the two components. In addition increasing the tackifier has a positive effect on the cohesive adhesion and therefore peeling energy. Increasing wax in the adhesive compositions led to lower viscosity and easier spread ability. The effect of tackifier and wax content on the viscoelastic properties of the hot melt adhesives is under way.
  9. Keywords:
  10. Adhesion ; Ethylene Vinyl Acetate (EVA) ; Hot Melt Adhesive ; Visco-Plastic Behavior ; Thermal Behavior

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