Visual observations of PLA blend film samples were studied during biodegradation. The different
blend ratios of PLA films demonstrated the degradable behaviors as shown in Fig.1.
During 14 days of burial time in soil, the specimens were disintegrated gradually upon the time course.
Changes of PLA blend films showed similarly the degradability from the previous work at the blending
ratio of 50:50 [10]. Some characteristics were changed such as brittle and turbidity after 7 days of soil
burial time. This might due to re-crystallization in the structure of PLA blend films under fluctuating
temperature during biodegradation [5]. Besides, the burial time and humidity are the other factors which
affected on degradable behaviors. An increase of degradability was found a function of the ratio PLA
blends. Therefore, different blends of PLA films gave different degradable behaviors. Concomitantly,
the water intake within the PLA films enhanced the microbial growth and to initiate the biodegradation
[2, 5]. Furthermore, comparing with the commercial PLA film (0:100), all ratios studied of the
PLA blend films presented more flexible.