AbstractThe viscoelastic properties of amylose triacetate films plasticized with diisobutyl phthalate were studied. The modulus–temperature curves of diisobutyl‐phthalate‐plasticized amylose triacetate are typical for amorphous polymers with the decrease of amylose triacetate content. The glassy modulus is not affected by the incorporation of diisobutyl phthalate, but the rubbery modulus and glass transition temperature are depressed with increased diisobutyl phthalate. The rubbery modulus appears at first to maintain for a wide temperature range, then disappears with increased diisobutyl phthalate. From the results of modulus–time measurements and x‐ray diffraction patterns: in a system of amylose triacetate–diisobutyl phthalate, amylose triacetate exists as an amorphous polymer at all concentrations of amylose triacetate and it acts intermediately between semicrystalline and amorphous polymers at lower concentrations belo
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