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TMDSC analysis of single-site copolymer blends after thermal fractionation

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Abstract

Temperature-modulated differential scanning calorimetry (TMDSC) has been used to study the melting of a series of blends containing linear low-density polyethylene (LLDPE) and very low-density polyethylenes (VLDPE) with long chain branches. After the blends were subjected to different thermal histories including thermal fractionation by stepwise isothermal cooling, they were examined by TMDSC. TMDSC curves have been interpreted in terms of a combination of the reversing and non-reversing specific heats that result from reversible and irreversible events at the time and temperature, which they are detected, respectively. It was found that crystals formed at different crystallisation conditions had different internal order; hence they showed different amounts of reversing and non-reversing contributions. There is no exothermic activity seen in the non-reversing signal for the thermally fractionated polymers and their blends suggesting formation of crystals approaching equilibrium. In contrast, polymers and blends cooled at 10°C min-1 cooling rate showed large exothermic contributions corresponding to irreversible effects. In addition, a true reversible melting contribution is also detected for both fast-cooled and thermally-fractionated samples during the quasi-isothermal measurements.

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Authors and Affiliations

  1. Department of Applied Chemistry, RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia

    G. Amarasinghe & R. A Shanks

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  1. G. Amarasinghe
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  2. R. A Shanks
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Amarasinghe, G., Shanks, R.A. TMDSC analysis of single-site copolymer blends after thermal fractionation. Journal of Thermal Analysis and Calorimetry 78, 349–361 (2004). https://doi.org/10.1023/B:JTAN.0000042181.39589.e8

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