http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/490 2013-05-18T13:20:41Z 2013-05-18T13:20:41Z Therattil, Sunil Jose Kuzhuppully, Anoop Anand Rani, Joseph http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/2001 2010-12-04T20:30:58Z 2008-01-01T00:00:00Z

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.

2008-01-01T00:00:00Z Rani, Joseph Abhilash, G Sabharwal, S Dubey, Abhinav Paul, Jose John, Honey http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/2000 2010-12-04T20:30:56Z 2009-01-01T00:00:00Z

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.

2009-01-01T00:00:00Z Abraham, Thomas N George, K E http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/1999 2010-12-04T20:30:57Z 2007-01-01T00:00:00Z

Short Nylon Fibre Reinforced PP: Melt Rheology Abraham, Thomas N; George, K E Short fiber reinforced thermoplastics have generated much interest these days since fibrous materials tend to increase both mechanical and thermal properties, such as tensile strength, flexural strength, flexural modulus, heat deflection temperature, creep resistance, and some times impact strength of thermoplastics. If the matrix and reinforcement are both based on polymers the composite are recyclable. The rheological behavior of recyclable composites based on nylon fiber reinforced polypropylene (PP) is reported in this paper. The rheological behavior was evaluated both using a capillary rheometer and a torque rheometer. The study showed that the composite became pseudoplastic with fiber content and hence fiber addition did not affect processing adversely at higher shear rates. The torque rheometer data resembled that obtained from the capillary rheometer. The energy of mixing and activation energy of mixing also did not show much variation from that of PP alone.

2007-01-01T00:00:00Z George, K E Komalan, C Kumar, P A S Varughese, K T Thomas, S http://dyuthi.cusat.ac.in:80/xmlui/handle/purl/1998 2010-12-04T20:30:56Z 2007-01-01T00:00:00Z

Dynamic mechanical analysis of binary and ternary polymer blends based on nylon copolymer/EPDM rubber and EPM grafted maleic anhydride compatibilizer George, K E; Komalan, C; Kumar, P A S; Varughese, K T; Thomas, S The dynamic mechanical properties such as storage modulus, loss modulus and damping properties of blends of nylon copolymer (PA6,66) with ethylene propylene diene (EPDM) rubber was investigated with special reference to the effect of blend ratio and compatibilisation over a temperature range –100°C to 150°C at different frequencies. The effect of change in the composition of the polymer blends on tanδ was studied to understand the extent of polymer miscibility and damping characteristics. The loss tangent curve of the blends exhibited two transition peaks, corresponding to the glass transition temperature (Tg) of individual components indicating incompatibility of the blend systems. The morphology of the blends has been examined by using scanning electron microscopy. The Arrhenius relationship was used to calculate the activation energy for the glass transition of the blends. Finally, attempts have been made to compare the experimental data with theoretical models.

2007-01-01T00:00:00Z