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Kaolin modified with sodium salt of rubber seed oil as a reinforcing filler for blends of natural rubber, polybutadiene rubber and acrylonitrile butadiene rubber


Blends of natural rubber (NR) and synthetic rubbers are widely used in the rubber industry to meet specific performance requirements. Further, the emerging field of organomodified clay‐ rubber nanocomposites could provide a host of novel materials having a unique combination of properties to meet various stringent service conditions. Previous studies have shown that at very low dosages, china clay (kaolin) modified with sodium salt of rubber seed oil (SRSO) improved the cure characteristics and physico‐mechanical properties of NR. Results of the present study show improved cure characteristics and physico‐mechanical properties for blends of NR with butadiene rubber (BR) / nitrile rubber (NBR) containing 4 phr of SRSO modified kaolin as indicated by reduction in optimum cure time (t90) along with higher tensile strength, tensile modulus and elongation at break for their vulcanizates as compared to those containing unmodified kaolin. The SRSO modified kaolin – rubber nanocomposites showed improved flex resistance, reduced heat buildup, tan delta (tanɗ) and loss modulus and higher chemical crosslink density index indicating reinforcing effect of SRSO modified kaolin, enabling them for potential industrial applications.

Authors:   V. Raji Vijay, Surya Ramakrishnan, Rugmini Sukumar, Brahmakumar M, A. R. Ravindranatha Menon
Journal:   Polymer International
Year:   2015
Pages:   n/a
DOI:   10.1002/pi.4956
Publication date:   15-Jun-2015
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