Recovery of thermal and mechanical properties after thermal treatment in a polyester-based polyurethane |
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Authors: | R. Russo |
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Affiliation: | (1) Present address: Istituto di Ricerche su Tecnologia dei Polimeri e Reologia del C.N.R., Via Toiano, 6, 80072 Arco Felice, Naples, Italy |
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Abstract: | Solution casted films of segmented polyurethanes based on poly (ethylene adipate) glycol, 4,4diphenylmethanediisocyanate, and 1,4 butanediol were studied by thermal-mechanical methods including differential scanning calorimetry and mechanical hysteresis. Data demonstrate that, following thermal treatment at 70 °C for 15 min, these polymers show time-dependent thermal and mechanical properties. In fact, because 70 °C is a temperature greater than the melting point of soft segments (about 42 °C), the soft-segment crystals are melted and their crystallization is time dependent. The results are explained in terms of phase separation. In particular, the sample with better phase separation has a faster and larger recovery. |
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Keywords: | Polyurethanes differentialscanningcalorimetry Young'smodulus mechanicalhysteresis |
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