Studies on the effect of silane coupling agent (2.0 per cent) on the mechanical properties of flyash filled polybutadiene rubber

603-609Flyash, a waste product of thermal power stations, generated in huge quantities has been posing problems of its disposal.As such it contains a variety of inorganic oxides and is available in finely powdered form. Attempts have been made for its utilization, as filler in elastomers and plastics. It is important to note that, flyash in untreated form does not contribute in enhancing mechanical properties of composites significantly. In this work, flyash treated with silane coupling agent (Si-69) is used as a filler in PBR. The comparison of properties of composites filled with treated and untreated flyash revealed that the composites with treated flyash showed better reinforcing properties. Flyash treated with silane coupling agent gave greater reinforcement than untreated flyash. The treatment resulted in enhancement of mechanical properties of composites of the said rubber. In this work, properties of composites filled with treated and untreated flyash (separately) are compared. The properties under consideration were tensile strength, modulus at 100 per cent, and 400 per cent, Young’s modulus, hardness, etc. Tensile strength was improved by 193 per cent while modulus at 400 per cent was improved by 700 per cent. Young’s modulus was also improved by 170 per cent

Studies on effect of titanate coupling agents on the mechanical properties of clay and talc filled styrene butadiene rubber

679-683Effect of titanate coupling agent on clay and talc has been studied with polybutadiene as a matrix. Tensile properties were measured on a computerized UTM using ASTM procedure. Comparison of properties of composites filled with treated and untreated fillers established that treatment of fillers imparts better reinforcing properties. The properties under consideration were tensile strength, modulus (100% & 400%), Young’s modulus, hardness, etc. Improvement in properties for clay and talc respectively were as follows: Tensile strength, 14, 19; Modulus (400%), 140, 90%; and Young’s modulus, 275, 25%.</b

Effect of bis (3-triethoxy silylpropyl) tetrasulphide on the mechanical properties of flyash filled styrene butadiene rubber

287-292Flyash does not contribute to properties of composites and hence there are severe limitations on its use as a filler. The paper reports determination and discussion on mechanical properties of SBR composites filled with flyash (treated and untreated). The flyash was treated with a silane coupling agent (TESPT) [Bis (3-triethoxysilylpropyl) ] tetrasulphide. The treatment resulted in enhancement of mechanical properties of composites of the rubber. In this work, properties of composites filled with treated and untreated flyash (separately) are compared. The properties under consideration were tensile strength, modulus at 100 and 400 per cent elongation, and hardness. Tensile strength was improved by 20 per cent while modulus at 100 per cent was improved by 30 per cent. Similarly Young’s modulus also was improved by 22 per cent

Studies on effect of titanate coupling agents on the mechanical properties of clay filled chloroprene rubber

830-834Clays belong to economic class of fillers, which are used extensively in rubbers and plastics. Being non-reinforcing in nature there are limitations for its use. If the properties of filler are modified it will get higher value as a filler. To achieve this modification of surface properties use of coupling agents is one of the avenues. In the present work, effect of treatment of titanate coupling agent on clay has been studied with chloroprene as a matrix. Composites were made with varying proportion of untreated and treated clay. A two-roll mill was used for dispersing the filler in the rubber and compression moulding technique was used to cure the compound in sheet form. Tensile properties were measured on a computerized UTM, using ASTM procedure. Comparison of properties of composites filled with treated and untreated clay established that treatment of clay imparts better reinforcing properties. The properties under consideration were tensile strength, modulus at 100 and 400 per cent, Young’s modulus, hardness, etc. Tensile strength was improved by 166 per cent, while modulus at 400 per cent was improved by 167 per cent. Similarly, Young’s modulus also was improved by 155 per cen