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Cure of Thermosetting Resins - Modelling and Experiments (Paperback, Softcover reprint of the original 1st ed. 1992)
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Cure of Thermosetting Resins - Modelling and Experiments (Paperback, Softcover reprint of the original 1st ed. 1992)
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Total price: R3,029
Discovery Miles: 30 290
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The process of cure of thermosets is rather complex, and good
knowledge of the various steps and different problems is necessary
for the user. For instance, the following basic facts characterise
the cure of thermosets: 1. In the same way as rubbers, thermosets
are generally polymerised and processed in a simple operation which
involves the irreversible transformation of a low molecular weight
resin in viscous liquid state into a solid network polymer. The
process of cure is thus much more important for thermosets or
rubbers than for thermo plastics, because if something goes wrong
during the cure process of thermosets, the final products may have
undersirable properties and will be of no use or value, while the
thermoplastic material can be melted again to make a new material.
2. In contrast with rubbers, a high exothermic cure reaction is the
aspect of fundamental importance in the cure process for thermo
sets. This high enthalpy of cure associated with a rather low
thermal conductivity can give rise to an excessively high tem
perature which may cause discoloration and degradation of the
material, and also to substantial temperature gradients. The mat
erial is thus heterogeneous during the process of cure, and these
temperature-time histories in the resin may have some effects on
the properties of the final material. 3. Moreover, the increase in
production following the reduction in time of the cure cycle
necessitates the use of a higher mould temperature.
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