For
a given value of relative humidity, addition of PLA was
responsible for a significant increase in both the tensile and
flexural strength of the hybrid foams over those of the pure
starch foams. Both percentage of elongation at break and
maximum flexural strain of the foams were found to initially
increase with increasing relative humidity level (up to ca.
42% RH) and then became practically constant at relative
humidity levels greater than ca. 42% RH (with an exception
to the starch/10 wt% PLA foams which were found to
increase slightly)