Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 6

The effect of conversion degree on the dynamic and static mechanical properties of the EPY epoxy material

MAGDALENA URBANIAK

nr katalogowy: 56493

Thermosetting polymers are versatile high-performance materials with applications chiefly in coatings, adhesives, composites, electronic encapsulants and circuit boards. One of the most important class such of polymers are epoxy resins because epoxy materials have some desirable properties like high compressive strength and good performance at elevated temperatures so they have found a wide and wide applications. On the glassy-state properties of these materials both temperature and conversion have an effect and therefore both are of importance for optimizing their performance. The transformation of linear epoxy resin to three-dimensional cross-linked thermosetting material is affected by the curing reaction with hardener. The curing reaction of thermoset resin is generally characterized by gelation and vitrification processes. The gelation process corresponds to a sudden and irreversible change of a viscous liquid into an elastic gel with a three-dimensional crosslinked network. The vitrification process implies the change from a liquid or rubbery state to a glassy one as a result of an increase in the cross-linking density of the material. It is well known that this phenomenon occurs when the glass transition temperature (Tg) becomes equal to the curing temperature (Tc). This vitrification point does not only denote such a change to the glassy state, but also an altering in the reaction mechanism passing from a chemically kinetically-controlled stage to diffusion-controlled one. At a given Tc the reaction of a thermosetting material proceeds generally at a rate dictated by chemical kinetics if Tg is lower than Tc; if not (i.e. Tg > Tc), the reaction rate may decrease by orders of magnitude due to a relative lack of mobility of the reactive groups [1]. The glass transition temperature (Tg) is one of the most important parameter of a polymeric system. Tg determines the temperature boundary of significant changes in the enthalpi[...]

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