scholarly journals Dependence of Adhesion Properties on Blend Ratio of Ethylene-Propylene-Diene Rubber/Standard Malaysian Rubber Blend Adhesive

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
B. T. Poh ◽  
J. Lamaming ◽  
G. S. Tay
Keyword(s):  
Dilution Effect ◽  
Peel Strength ◽  
Adhesion Properties ◽  
Blend Ratio ◽  
Ethylene Propylene ◽  
Ethylene Propylene Diene Rubber ◽  
Poly Ethylene ◽  
Pet Film ◽  
Blend Ratios ◽  
Diene Rubber

Viscosity, tack and, peel and shear strengths of ethylene-propylene-diene rubber (EPDM)/standard Malaysian rubber (SMR L) blend adhesive were studied using various blend ratios of the two rubbers, ranging from 0 to 100% EPDM. Coumarone-indene resin, toluene, and poly(ethylene terephthalate) (PET) were used as the tackifier, solvent, and coating substrate, respectively. The tackifier content was fixed at 40 parts per hundred parts of rubber (phr). A SHEEN hand coater was used to coat the adhesive on PET film at four coating thicknesses, that is, 30, 60, 90, and 120 µm. The viscosity and adhesion properties were determined by a Brookfield viscometer and a Lloyd Adhesion Tester, respectively. Results show that the viscosity, loop tacks and peel strength of blend adhesives decrease gradually with increasing % EPDM. This observation is attributed to dilution effect and lowering in wettability and compatibility. Shear strength, however, passes through a maximum at 20–40% EPDM blend ratio, an observation which is ascribed to culmination of cohesive strength at the optimum EPDM blend ratio. Increasing coating thickness increases the adhesion properties in all blend ratios in this study.

scholarly journals Compatibilization of Poly(Lactic Acid) (PLA) and Bio-Based Ethylene-Propylene-Diene-Rubber (EPDM) via Reactive Extrusion with Different Coagents

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 605
Author(s):  
Alexander Piontek ◽  
Oscar Vernaez ◽  
Stephan Kabasci
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Lactic Acid ◽  
Reactive Extrusion ◽  
Poly Lactic Acid ◽  
Ethylene Propylene ◽  
Twin Screw ◽  
Ethylene Propylene Diene Rubber ◽  
Poly Ethylene ◽  
Diene Rubber

Much effort has been made to enhance the toughness of poly (lactic acid) (PLA) to broaden its possible range of usage in technical applications. In this work, the compatibility of PLA with a partly bio-based ethylene-propylene-diene-rubber (EPDM) through reactive extrusion was investigated. The concentration of EPDM in the PLA matrix was in the range of up to 20%. The reactive extrusion was carried out in a conventional twin-screw extruder. Contact angle measurements were performed to calculate the interfacial tension and thus the compatibility between the phases. The thermal and mechanical properties as well as the phase morphology of the blends were characterized. A copolymer of poly (ethylene-co-methyl acrylate-co-glycidyl methacrylate) (EMAGMA) was used as compatibilizer, which leads to a significant reduction in the particle size of the dispersed rubber phase when compared with the blends without this copolymer. The use of EMAGMA combined with soybean oil (SBO) and a radical initiator enhances the elongation at break of the compound. The results indicate that the reduction of the particle size of the dispersed phase obtained with the compatibilizer alone is not sufficient to improve the mechanical properties of the blend system. The induced radical reactions also influenced the mechanical properties of the blend significantly.

Cellular Morphology, Peel Strength and Thermal Conductivity for Wood/NR and Expanded EPDM Laminates for Roofing Applications

2008 ◽  
Vol 47-50 ◽  
pp. 181-184
Author(s):  
W. Yamsaengsung ◽  
Narongrit Sombatsompop
Keyword(s):  
Thermal Conductivity ◽  
Peel Strength ◽  
Optimum Concentration ◽  
Cellular Morphology ◽  
Ethylene Propylene ◽  
Blowing Agent ◽  
Rubber Composite ◽  
Ethylene Propylene Diene Rubber ◽  
Diene Rubber

Melt-laminates of wood/NR and expanded ethylene-propylene-diene-rubber (EPDM) were prepared for rubber composite roofs. The ethylene-propylene bound OBSH (EPR-b-OBSH) blowing agent was introduced as an effective blowing agent in the EPDM layer and the foam property results were compared with the pure OBSH blowing agent. It was found that the EPR-b- OBSH gave expanded EPDM layer with a larger number of more uniform cells. The optimum concentration for EPR-b-OBSH blowing agent for achieving the maximum peel strength and for lowering the thermal conductivity of the wood/NR-eEPDM laminate was 3.0phr.

scholarly journals Adhesion Properties of Acrylonitrile-Butadiene Rubber/Standard Malaysian Rubber Blend Based Pressure-Sensitive Adhesive

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
B. T. Poh ◽  
J. Lamaming ◽  
G. S. Tay
Keyword(s):  
Shear Strength ◽  
Peel Strength ◽  
Coated Sample ◽  
Butadiene Rubber ◽  
Pressure Sensitive Adhesive ◽  
Adhesion Properties ◽  
Pressure Sensitive ◽  
Poly Ethylene ◽  
Pet Film ◽  
Peel Tests

Viscosity and adhesion properties of NBR/SMR L blend based pressure-sensitive adhesive were investigated using coumarone-indene resin, toluene, and poly(ethylene terephthalate) (PET) as tackifier, solvent, and coating substrate, respectively. Coumarone-indene resin content was fixed at 40 parts per hundred parts of rubber (phr) in the adhesive formulation. The ratio of NBR/SMR L blend used was 0, 20, 40, 60, 80, and 100% of NBR content. Four different thicknesses, that is, 30, 60, 90, and 120 µm, were used to coat the PET film. The viscosity of adhesive was determined by a Brookfield viscometer, whereas loop tack, peel strength, and shear strength were measured using a Lloyd Adhesion Tester operating at 30 cm/min. Result indicates that the viscosity, loop tack, and shear strength of blend adhesives increase with % NBR. However, for peel strength, it indicates a maximum at 40% NBR blend ratio for the three modes of peel tests. In all cases, 120 µm coated sample consistently exhibits the highest adhesion values compared to the other coating thicknesses, an observation which is associated with the higher volume of adhesive in the former system.

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

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
B. T. Poh ◽  
Y. Y. Teh
Keyword(s):  
Shear Strength ◽  
Natural Rubber ◽  
Benzoyl Peroxide ◽  
Coating Thickness ◽  
Crosslinking Agent ◽  
Peel Strength ◽  
Peroxide Content ◽  
Ethylene Propylene ◽  
Ethylene Propylene Diene Rubber ◽  
Diene Rubber

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.

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