Rubber Blend (ENR25/NBR) Based Pressure-Sensitive Adhesives

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dc.contributor.authorSoo, Kai Wai
dc.date.accessioned2019-09-04T07:57:52Z
dc.date.available2019-09-04T07:57:52Z
dc.date.issued2017-07
dc.description.abstractIn this study, the synthesis and characterization of epoxidized natural rubber (ENR 25)/ acrylonitrile-butadiene rubber (NBR) blend pressure sensitive adhesive (PSA) were presented. The blend ratio of ENR25/NBR was fixed at 0, 20, 40, 60, 80, and 100% of ENR 25 content. The zinc oxide (ZnO) and magnesium oxide (MgO) were used as a reinforcing filler to prepare the composite adhesive. Five different loadings, i.e. 10, 20, 30, 40 and 50 phr filler was used in the adhesive formulation. The benzoyl peroxide (BPO) is used as a crosslinking agent to prepare the crosslinked adhesive. The loading of benzoyl peroxide was varied from 1 to 5 phr. Toluene was used as solvent throughout the study. Coumarone-indene, petro resin and gum rosin were used as tackifiers. A SHEEN hand coater was used to coat the adhesive on polyethylene terephthalate (PET) at 30, 60, 90, and 120 μm coating thickness. Adhesion properties (loop tack, peel strength, and shear strength) of adhesives were measured using a Lloyd adhesion tester operating at 10–60 cm/min. Equilibrium swelling in toluene was used to measure the crosslinking density of the crosslinked adhesive. The results show that the viscosity of the adhesive decreases with increasing % ENR 25 and increase with the filler loading. The results also show that an increase adhesion properties, storage modulus and loss modulus for crosslinked adhesives and composite adhesives. Crosslinked adhesives which show lower percentage of swelling, produced higher percentage of gel content and have higher crosslink density. TGA thermograms show that addition of ZnO, MgO and BPO improved the thermal stability of ENR25/NBR rubber blend to different degrees depending on ZnO, MgO and BPO loading. The DSC thermogram confirms the miscibility of the ENR25/NBR rubber blend. The SEM micrographs demonstrate the occurrence of cohesive and adhesion failure modes of the rubber adhesive.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/8814
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectRubber blend (ENR25/NBR) baseden_US
dc.subjectpressure-sensitive adhesivesen_US
dc.titleRubber Blend (ENR25/NBR) Based Pressure-Sensitive Adhesivesen_US
dc.typeThesisen_US
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