Effect of Compatibilizers on Rheology, Crosslink Density and Mechanical Properties of NR/NBR Blend

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Chatchawan Kantala
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Ekachai Wimolmala
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Narongrit Sombatsompop
King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140
Chakrit Sirisinha
Mahidol University Salaya Campus, Phutthamonthon 4 Rd. Salaya, Nakhon Pathom 73170

Abstract

This study investigated the effect of compatibilizer type and content on rheology, crosslink densityand mechanical properties of rubber blend of natural rubber (NR) and Nitrile Rubber (NBR) (using 20:80ratio of NR:NBR). The compatilizers used in this work were chloroprene rubber (CR) and epoxidizednatural rubber (ENR), the dosages varying from 0 to 7 phr. The experimental results suggested thatadding both compatibilizers resulted in an increase in complex viscosity of the blend, the effect beingpronounced with ENR compatibilizer. The use of compatibilizers did not affect scorch time, cure timeand torque difference of the blend. The incorporation of these two compactibilizers was found to improvethe crosslink density and mechanical properties of the blend, the recommended dosage of the compatibilizersbeing 5 phr.

Keywords : Natural Rubber / Nitrile Rubber / Rheological Properties / Compatibilizer / MechanicalProperties

Article Details

Issue
Vol. 30 No. 4 (2007): October - December
Section
Original Articles
Author Biographies

Chatchawan Kantala, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Master Degree Student, Division of Material Technology, Polymer Processing and Flow (P-PROF) Group, School of Energy,Environment and Materials.

Ekachai Wimolmala, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Researcher, Polymer Processing and Flow (P-PROF) Group, School of Energy, Environment and Materials.

Narongrit Sombatsompop, King Mongkut's University of Technology Thonburi, Bangmod, Toongkru, Bangkok 10140

Professor, Polymer Processing and Flow (P-PROF) Group, School of Energy, Environment and Materials.

Chakrit Sirisinha, Mahidol University Salaya Campus, Phutthamonthon 4 Rd. Salaya, Nakhon Pathom 73170

Associate Professor, Department of Chemistry, Faculty of Science.