Thesis (M.Sc.)--Chulalongkorn University, 1997

The objective of this research is to prepare polyurethane and polyurethane/polystyrene elastomers by using Bis-(3-allyloxy-2-propanol) diphenylolpropane (BAPD) as a crosslinking agent. BAPD contains unsaturated double bonds at both terminals and two hydroxy groups in the molecule. The structures of the obtained polyurethane and polyurethane/polystyrene elastomers are crosslinked network. The compatibility of different phases in the elastomers could be observed from the transparency of the materials and by SEM technique. The mechanical properties including tensile strength and elongation at break of PU and PU/PS elastomers were measured. The values of tensile strength and elongation at break of polymers were in the ranges of 9.59-77.01 kg/cm2 and 57.55-294.57 %, respectively depending upon the equivalent weight ratio, initiator and amount of styrene monomer used. The glass transition temperature and thermal stability were determined by differential scaning calorimetry and thermogravimetric analysis.