The HDT data of the PLA and its WS composites is
presented in Figure 9. One of the major inherent
weaknesses of PLA is its low HDT which was found to be
around 57 8C. An increased HDT (over 100 8C) would be
desired for most durable applications however, compatibilization
through use of thePLA-g-MA did not alter the HDT
of PLA.