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TMDSC and Dynamic Rheometry, Gelation, Vitrification and Autoacceleration in the Cure of an Unsaturated Polyester Resin

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Abstract

The free radical cross-linking copolymerization of an unsaturated polyester resin with styrene is studied in isothermal conditions using temperature modulated differential scanning calorimetry (TMDSC) and dynamic rheometry. The dynamic rheometry measurements show that gelation occurs at a conversion below 5%, while TMDSC measurements show that an important autoacceleration starts near 60% conversion, giving rise to a maximum cure rate closely before the (partial) vitrification of the system near 80%. This indicates that the autoacceleration is not due to the sharp increase in bulk viscosity at gelation, but rather to a change in molecular mobilities at higher conversion.

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Authors and Affiliations

  1. Dept. for Physical Chemistry and Polymer Science, Vrije Universiteit Brussel, Pleinlaan 2, 1050, Brussel, Belgium

    G. Van Assche & B. Van Mele

  2. TA Instruments Benelux, Waters, Raketstraat 60, 1130, Brussel, Belgium

    E. Verdonck

Authors
  1. G. Van Assche
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  2. E. Verdonck
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  3. B. Van Mele
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Van Assche, G., Verdonck, E. & Van Mele, B. TMDSC and Dynamic Rheometry, Gelation, Vitrification and Autoacceleration in the Cure of an Unsaturated Polyester Resin. Journal of Thermal Analysis and Calorimetry 59, 305–318 (2000). https://doi.org/10.1023/A:1010112718501

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