The morphological changes of different ratios of the PLA blend films during biodegradation in soil
burial experiment were determined by DSC method. Two important parameters, namely glass transition
temperature (Tg) and melting temperature (Tm) were used to derive them from the estimation [5]. The
results were summarized in Table 1. To demonstrate the PLA films in soil burial, the PLA blend films
produced from Lecitase Ultra found increasing their approximate Tg values from at 52ºC to 60ºC after in
soil burial. For the PLA blend films produced from Lipozyme TL IM found an increasing of approximate
Tg values from 41-73ºC to 48-60ºC after in soil burial. For Tm values after soil burial, their changes were
from approximately 133-136ºC to 140oC for the PLA blend film produced from Lecitase Ultra, and from
126-140ºC to 137-142ºC for the PLA blend film produced from Lipozyme TL IM, respectively. These
results indicate that during biodegradation occurred the change of structures within the films due to there