Three unsaturated polyesters were crosslinked with different amounts of styrene, and for the resulting polymers the 10‐sec. shear modulus was measured as a function of temperature. It was observed that the polymers have well defined glassy, transition, and rubbery regions. The equation for the shear modulus from the theory of rubber elasticity was applied for the plateau regions of the polymers.
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Katz et al. (1964) studied this question.
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