2. time-temperature superposition was applied to the maximum in dielectric loss factors meas ured on poly(vinyl acetate).+ data collected at different temperatures were shifted to match at tg = 28°c. the shift factors for the frequency (in hertz) at the maximum were found to obey the wlf equation in the following form: log w +6.9 = [19.6(t- 28))/[42 +(t- 28)]. esti mate the fractional free volume at tg and a for the free volume from these data. recalling from chapter 11 that the loss factor for the mechanical properties occurs at wr = 1, estimate the relaxation time for poly(vinyl acetate) at 40°c and 28.5°c.
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Chemistry, 21.06.2019 23:00, AbhiramAkella
Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?
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Chemistry, 22.06.2019 08:30, Blaise2653
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An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.
Answers: 1
2. time-temperature superposition was applied to the maximum in dielectric loss factors meas ured o...
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