EFFECT OF MACROGLYCOL STRUCTURE AND ITS MOLECULAR-WEIGHT ON PHYSICOMECHANICAL PROPERTIES OF POLYURETHANES

The molecular weight of polyester polyol plays an important role in controlling mechanical and dynamic mechanical properties of polyurethanes. Two systems are studied for evaluation of these properties. Since the properties of polyurethanes are derived from the properties of various constituents involved in their synthesis, the magnitude of properties of polyurethanes are also studied. Dynamic mechanical properties are analyzed using a dynamic mechanical analyzer that employs the principle of compound resonance. (C) 1995 John Wiley and Sons, Inc

REINFORCEMENT IN POLYBUTADIENE BY METAL-OXIDES

The effects of chemical characteristics of metal oxide fillers on mechanical and dynamic mechanical properties of polybutadiene are investigated

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

DYNAMIC MECHANICAL-PROPERTIES OF FILLED POLYBUTADIENE

The effect of filler on dynamic mechanical properties of polybutadiene-barium fluoride composites are investigated. The properties studied are; glass transition temperature, storage modulus and loss modulus