75 , 76 As for β′′, G ′′ is difficult to measure with rheometry so far into the glassy state, thus it does not have a clear trend with increasing frequency up from 5 MHz.
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Analyzing QCM Data Using a New Transfer-Matrix Model: Long-Ranged Asymmetric Gradient in Shear Modulus Identified Across Immiscible Glassy-Rubbery Polymer Interface.
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