Blending of Natural Rubber/Recycled Ethylene-Propylene-diene Rubber: Promoting the Interfacial Adhesion Between Phases by Natural Rubber Latex

Abstract The thermochemical recycling of natural rubber (NR) and ethylene-propylene-diene rubber (EPDM) vulcanizates with disulfides was studied. NR sulfur vulcanizates were completely plasticized when heated with diphenyldisulfide at 200 °C. It could be concluded that both main chain scission and crosslink scission caused the network breakdown. NR peroxide vulcanizates were less reactive towards disulfide at 200 °C, and only reacted through main chain scission. For EPDM a temperature range of 200–275 °C was studied. In the presence of diphenyldisulfide at 200 °C there was almost no devulcanization of EPDM sulfur vulcanizates, and at 225 and 250 °C there was only slightly more devulcanization. A decrease in crosslink density of 90% was found when 2×10−4 mol diphenyldisulfide/cm3 vulcanizate was added and the EPDM sulfur vulcanizates were heated to 275 °C. EPDM peroxide vulcanizates showed a decrease in crosslink density of ca. 40% under the same conditions. The lower reactivity of EPDM towards disulfide compared with NR is the result of higher crosslink densities, the presence of a higher percentage of more stable monosulfidic crosslinks and the fact that EPDM is less apt to main chain scission relative to NR.

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Effect of adhesive-coated glass fiber in natural rubber (NR), acrylonitrile rubber (NBR), and ethylene-propylene-diene rubber (EPDM) formulations. II. Effect of cyclic loading, abrasion, and accelerated aging

Journal of Applied Polymer Science ◽

10.1002/app.13177 ◽

2003 ◽

Vol 91 (2) ◽

pp. 1124-1135 ◽

Cited By ~ 1

Author(s):

P. Rathinasamy ◽

P. Balamurugan ◽

S. Balu ◽

V. Subrahmanian

Keyword(s):

Cyclic Loading ◽

Natural Rubber ◽

Glass Fiber ◽

Accelerated Aging ◽

Ethylene Propylene ◽

Coated Glass ◽

Ethylene Propylene Diene Rubber ◽

Diene Rubber

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Compatibilization Efficiency of Polybutadiene-Grafted Maleic Anhydride in Ethylene-Propylene Diene Rubber/Epoxidized Natural Rubber Blends

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.705.45 ◽

2016 ◽

Vol 705 ◽

pp. 45-49 ◽

Cited By ~ 1

Author(s):

Sarawut Prasertsri ◽

Pranee Nuinu ◽

Sansanee Srichan ◽

Siriwat Radabutra ◽

Chaiwute Vudjung ◽

...

Keyword(s):

Maleic Anhydride ◽

Natural Rubber ◽

Dynamic Properties ◽

Epoxidized Natural Rubber ◽

Cure Rate ◽

Maximum Torque ◽

Ethylene Propylene ◽

Rubber Blends ◽

Ethylene Propylene Diene Rubber ◽

Diene Rubber

This research aims to investigate the efficiency of polybutadiene-grafted maleic anhydride (PB-g-MAH) as the compatibilizer for ethylene-propylene diene rubber and epoxidized natural rubber (EPDM/ENR) blends. PB-g-MAH was varied from 0-10 parts per hundred parts of rubber (phr), and the cure characteristics, mechanical and dynamic properties of 70/30 EPDM/ENR blends with and without compatibilizer were evaluated. It was found that the minimum torque, maximum torque, scorch and cure times of the blends increased after adding PB-g-MAH, whereas cure rate decreased. The morphology of the blend is improved by the addition of PB-g-MAH in small amounts, owing to an improved compatibility of these rubbers confirmed by dynamic mechanical property. The hardness and oil resistance increased with increasing PB-g-MAH content. Of all blends investigated, the blend compatibilized with 2-4 phr of PB-g-MAH shows the optimum mechanical properties and thermal resistance.

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