Effect of temperature on viscosity of modified unsaturated polyester resins

Unsaturated polyester, UP, resins were obtained by reacting the propylene or ethylene glycol, PG or EG, maleic anhydride as a source of double bond, phthalic anhydride and isophthalic acid as dibasic acids. The condensate obtained was mixed with styrene monomer to get an unsaturated polyester resin formulation. The dilute UP resin solution thus obtained has a viscosity in the range 200–2000 cps. This viscosity changes sharply with temperature and affects resin processability. In this work three modified resin produced and their viscosity change in near ambient temperature studied. Results show that 30 degree increase in resin temperature decrease resin viscosity to one third

کلیدواژه ها:

unsaturated polyester resin ، viscosity ، temperature ، modified resin ، composite