Chemistry Reference
In-Depth Information
1.5 Conclusions
Rosin acids were demonstrated to be potential alternatives to aromatic or cycloaliphatic
compounds in the preparation of curing agents for epoxies. Rosin-derived acid
anhydride and carboxylic acid types of curing agents can be synthesised
via
relatively
simple reactions. Rosin-derived curing agents exhibited similar curing reactivity and
curing temperatures as their petroleum-based analogues. The fused ring structure of
rosin acids also imparts a similar rigidity to the molecules of curing agents to that of
their petroleum-based aromatic and cycloapliphatic counterparts. Epoxy resins cured
with rosin-derived curing agents displayed very comparable mechanical and thermal
properties to those cured with current petroleum-based curing agents. Furthermore,
the molecular stiffness (or flexibility) of the rosin-derived curing agents could be
manipulated to result in balanced properties of the cured resins and to regulate the
softening point and miscibility of the rosin-derived curing agents.
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