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A master curve for polyisobutylene ( PIB) indicates that stress relaxes to a modulus of 10dyn/cm2 in about 10h at 25C. Using the WLF equation,

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A master curve for polyisobutylene ( PIB) indicates that stress relaxes to a modulus of 10dyn/cm2 in about 10h at 25C. Using the WLF equation, estimate the time it will take to reach the same modulus at temperature of 20C. For PIB,Tg=70C. logaT=51.6+TTg17.44(TTg)

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