http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/491 Fri, 24 May 2013 04:30:34 GMT 2013-05-24T04:30:34Z http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/2001 Compatibility Studies on Sulphur Cured EPDM/CIIR Blends Therattil, Sunil Jose; Kuzhuppully, Anoop Anand; Rani, Joseph The principal objective of this study was to explore the compatibility of a blend of two synthetic elastomers viz., ethylene-propylene-diene rubber (EPDM) and chlorobutyl rubber (CIIR). Various commercial grades of EPDM were blended with a specific grade of CIIR at different proportions. The mechanical properties such as tensile strength, tear strength, ageing resistance, etc. were studied. On the basis of the observed physical properties, two particular grades of EPDM were found to be compatible with CIIR. Differential scanning calorimetry and scanning electron microscopy confirmed the results. Chlorosulphonated polyethylene was added as a compatibilizing agent to overcome the phase separation of the other two incompatible grades of EPDM in blending with CIIR. The results revealed that the addition of compatibilizer greatly improves the compatibility and thereby the properties of the blends. Tue, 01 Jan 2008 00:00:00 GMT http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/2001 2008-01-01T00:00:00Z http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/2000 Preparation of Low-Protein Natural Rubber Latex: Effect of Polyethylene Glycol Rani, Joseph; Abhilash, G; Sabharwal, S; Dubey, Abhinav; Paul, Jose; John, Honey Low-protein content natural rubber latex was produced by using a nonionic surfactant-polyethylene glycol (PEG). Extractable protein content of natural rubber latex was found to decrease with PEG treatment and reduction increased with increase in the molecular weight of PEG. The low-protein latex samples were characterized by tensile testing, Fourier transform infrared and thermogravimetric analysis. The results have shown 35% reduction in the extractable protein content, without any compromise on the mechanical properties of the latex; however, thermal stability of low-protein latex was found to be reduced marginally with PEG treatment. Thu, 01 Jan 2009 00:00:00 GMT http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/2000 2009-01-01T00:00:00Z http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/871 Rubber Seed Oil: A Multipurpose Additive in NR and SBR Compounds Rani, Joseph ABSTRACT: Rubber seed oil was used as a multipurpose ingredient in natural rubber (NR) and styrene butadiene rubber (SBR) compounds. The study shows that the oil, when substituted for conventional plasticiser, imparts excellent mechanical properties to NR and SBR vulcanizates. Further, it also improves aging resistance, reduces cure time, increases abrasion resistance and flex resistance, and reduces blooming. Thu, 20 Aug 1998 00:00:00 GMT http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/871 1998-08-20T00:00:00Z http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/870 Xanthate Accelerators for Low Temperature Curing of Natural Rubber Rani, Joseph ABSTRACT: Zinc salts of ethyl, isopropyl, and butyl xanthates were prepared in the laboratory. They were purified by reprecipitation and were characterized by IR, NMR, and thermogravimetric analysis techniques. The melting points were also determined. The rubber compounds with different xanthate accelerators were cured at temperatures from 30 to 150°C. The sheets were molded and properties such as tensile strength, tear strength, crosslink density, elongation at break, and modulus at 300% elongation were evaluated. The properties showed that all three xanthate accelerators are effective for room temperature curing. Mon, 20 Mar 2000 00:00:00 GMT http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/870 2000-03-20T00:00:00Z