Kirk Abbey - Properties and toughening of heat-resistant thermosets based on unsaturated ester resins

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      Publication Details (including relevant citation   information):

      J. Applied Polymer Science 86(4), 821-843 (2002)

      Abstract:

      We describe our investigations of the curing chemistry and   properties of heat-resistant thermosets comprised of unsaturated   ester resins. We suggest a mechanism for the rearrangement of the   cured matrix and volatile evolution during the curing process. We   employed dielectric spectroscopy (DES) as a tool for monitoring   the extent of cure, determining glass-transition temperatures,   and evaluating electrical properties of the resins. We compare   and contrast results obtained by DES to results obtained by   dynamic mechanical analysis (DMA). Fracture testing showed that   improvements were made in the toughness of these materials by   blending the uncured resin with impact modifiers such as   hydrocarbon or silicone reactive rubber adducts or poly(arylene   ether sulfone)-based thermoplastic oligomers. We determined the   effects of the thermoplastic toughening additive's molecular   weight, concentration, and endgroup functionality on the phase   separation, thermal stability, and fracture toughness of the   blend.

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