Material Properties and Influence of Molecular Weight and Testing Rate on Adhesion Properties of Epoxidized Natural Rubber-Based Adhesives |
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Authors: | Imran Khan B T Poh |
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Institution: | (1) Division of Bio-Resource, Paper and Coatings Technology, School of Industrial Technology, Universiti Sains Malaysia, 11800 Penang, Malaysia |
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Abstract: | The effect of molecular weight and testing rate on peel and shear strength of epoxidized natural rubber (ENR-50)-based adhesive
was investigated using petro resin as the tackifier. Toluene and polyethylene terephthalate were used as the solvent and substrate
respectively. Peel and shear strength were determined by a Llyod Adhesion Tester operating at different rates of testing.
Result shows that peel strength and shear strength increases up to an optimum molecular weight of 4.2 × 104 g/mol of ENR-50. This observation is attributed to the combined effects of wettability and mechanical strength of rubber
for peel strength. For shear strength, it is ascribed to the optimum cohesive and adhesive strength. Both peel strength and
shear strength increases with increasing rate of testing, an observation which is associated to the viscoeslastic response
of the adhesive. Thermal study, SEM and FTIR study confirms the miscibility of tackifier with ENR-50. |
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