Question: 4. The stress relaxation modulus for a polyisobutene sample at 0 C is 2.5x105 N/m. The stress here is measured 10 min after imposition

4. The stress relaxation modulus for a polyisobutene sample at 0 C

4. The stress relaxation modulus for a polyisobutene sample at 0 C is 2.5x105 N/m. The stress here is measured 10 min after imposition of affixed deformation. Use the WLF equation to estimate the temperature at which the relaxation modulus is 2.5x105 N/m for a measuring time of 1 min. (assume the Tg for polyisobutene is -70 C).

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The WilliamsLandelFerry WLF equation is given by logE C1 T T0 C2 Where E is the relaxation modulu... View full answer

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