Characterization of Reacting Polymer Systems by Temperature-Modulated Differential Scanning Calorimetry |
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Authors: | Swier S. Van Assche G. Van Hemelrijck A. Rahier H. Verdonck E. Van Mele B. |
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Affiliation: | (1) Department of Physical Chemistry and Polymer Science, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium |
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Abstract: | The benefits of temperature-modulated differential scanning calorimetry to characterize reacting polymers are illustrated for different experimental systems. The effects of combined isothermal and non-isothermal cure paths on (de)vitrification, mobility-restricted reactions, and relaxation during vitrification are discussed for anhydride- and amine-cured epoxies. The simultaneous measurement of heat capacity, heat flow, and heat flow phase provides an excellent tool for mechanistic interpretations. The influence of the metakaolinite particle size on the production of inorganic silicate-metakaolinite polymer glasses is treated as an example. These principles are further illustrated for primary and secondary amine-epoxy step growth reactions, and for styrene-cured unsaturated polyester chain growth reactions with ‘gel effect’. Finally, the effects of isothermal cure and temperature on reaction-induced phase separation in a polyethersulfone modified epoxy-amine system are highlighted. This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | epoxy resin inorganic polymer glass reaction-induced phase separation reaction mechanism TMDSC unsaturated polyester resin |
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