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The hypothesis that plasticizer phase separation broadens glass transition temperatures when the temperature of a PVC/plasticizer formulation is raised was tested using dynamic mechanical analysis and NMR. NMR is a reasonable tool for detecting the phases. Phase separation in the vicinity of T g is an explanation for the broadening of the transition region. But a variety of behavior is possible depending on the details of the measurement of T g and on the thermal history of the sample. Phase separation broadening is in addition to the broadening caused by changes in the dimensionality of the damped Debye lattice described by Tobolsky.
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Boo et al. (1987) studied this question.
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