Peel Adhesion of Natural Rubber Bonded to Polyethylene Terephthalate: Effect of Crosslinking on Rate/Temperature Response

J of Applied Polymer Sci

Cheong

2011

The loop tack, peel, and shear strength of crosslinked natural rubber adhesive were studied using coumarone-indene and toluene as the tackifying resin and solvent, respectively. The concentration of benzoyl peroxide-the crosslinking agent-was varied from 1 to 4 parts per hundred parts of rubber (phr). A SHEEN hand coater was used to coat the adhesive on the polyethylene terephthalate substrate at various coating thickness. Loop tack, peel, and shear strength were measured by a Llyod adhesion tester operating at 30 cm min À1 . Result shows that loop tack and peel strength of the adhesive increases up to 2 phr of benzoyl peroxide concentration after which it decreases with further benzoyl peroxide content. This observation is attributed to the optimum crosslinking of natural rubber where optimum cohesive and adhesive strength occurs at 2 phr peroxide loading. However, for the shear strength, it increases with increasing benzoyl peroxide concentration where higher rate of increase is observed after 2 phr of peroxide content, an observation which is associated to the steady increase in cohesive strength of crosslinked rubber. In all cases, the adhesion properties of adhesives increase with increase in coating thickness.

Section: Introductionmentioning

confidence: 99%

Adhesion behavior of natural rubber‐based adhesives crosslinked by benzoyl peroxide

J of Applied Polymer Sci

Cheong

2011

“…Verdier et al studied the peeling of crosslinked and uncrosslinked acrylic pressure‐sensitive adhesive. Hamed et al reported the effect of crosslinking on rate/temperature response on peel adhesion of natural rubber bonded to polyethylene terephthalate (PET). Meanwhile, Jensen et al investigated the linear rheology of crosslinked polypropylene oxide as a pressure‐sensitive adhesive.…”

Section: Introductionmentioning

confidence: 99%

Adhesion properties of benzoyl peroxide crosslinked epoxidized natural rubber (ENR 25)-based pressure-sensitive adhesives

Suid

2014

J Vinyl Addit Technol

Adhesion properties of crosslinked (epoxidized natural rubber)‐based adhesives were studied by using coumarone‐indene, benzoyl peroxide, and toluene as tackifying resin, crosslinking agent, and solvent, respectively. The adhesion properties were measured by a Lloyd Adhesion Tester operating at 30 cm min−1. Results show that loop tackiness and peel strength pass through a maximum value at 1 phr (parts by weight per hundred parts of resin) of benzoyl peroxide concentration, an observation that is attributed to the optimum crosslinking of epoxidized natural rubber whereby optimum cohesive and adhesive strength are obtained. However, shear strength increases with increasing benzoyl peroxide concentration wherein the higher rate of increase is observed between 0 and 1 phr of benzoyl peroxide content. This observation is associated with the steady increase in cohesive strength as crosslinking is increased. In all cases, the adhesion properties of adhesives increased with increasing coating thickness. J. VINYL ADDIT. TECHNOL., 22:8–12, 2016. © 2014 Society of Plastics Engineers

“…However, the adhesion properties of crosslinked rubberbased adhesives are scarcely reported in the literature. Hamed and Preechatiwong [4] found that during peeling action, strain-induced crystallization occurs for uncrosslinked and lightly crosslinked natural rubber. In the case of highly crosslinked natural rubber, no strain-induced crystallization was observed.…”

Section: Introductionmentioning

confidence: 99%

Dependence of Adhesion Property of Epoxidized Natural Rubber (ENR 25)/Ethylene-Propylene-Diene Rubber Blend Adhesives Crosslinked by Benzoyl Peroxide

Teh

2014

Journal of Coatings

The loop tack, peel strength, and shear strength of crosslinked epoxidized natural rubber (ENR 25)/ethylene-propylene-diene rubber (EPDM) blend adhesives were investigated. Coumarone-indene resin, toluene, and benzoyl peroxide were used as the tackifier, solvent, and crosslinking agent, respectively, throughout the experiment. The adhesive was coated on a polyethylene terephthalate (PET) substrate using a SHEEN hand coater at 60 μm and 120 μm coating thickness. It was cured at 80°C for 30 minutes before testing on a Lloyd adhesion tester operating at testing rates from 10 to 60 cm min−1. Results show that loop tack and peel strength of the ENR 25/EPDM adhesive pass through a maximum value at 2 parts per hundred parts of rubber (phr) of benzoyl peroxide content. This observation is attributed to the increase in crosslinking which enhances the cohesive strength of the adhesive. Further addition of the crosslinking agent decreases the tack and peel strength due to the decrease in wettability of the over-crosslinked adhesive. Shear strength, however, increases steadily with benzoyl peroxide content, an observation which is associated with the steady increase in the cohesive strength. The adhesion properties increase with increasing coating thickness and testing rate.