SUBJECT: Polymer material

Stress relaxation modulus, M(t), of a polymer at 30C is expressed as M(t)=2t0.05 where M(t) is in GPa and t is in second. If the glass transition temperature of the polymer is 30C, use the WLF equation and determine the 1-year relaxation modulus of the polymer at 60C. WLF equation: logat=51.6+(TTg)17.4(TTg)