Study of Morphology Poly Lactic Acid (PLA) films Surface after Microorganism Degradation by Scanning Electron Microscopy (SEM)

in International Symposium (poster paper), 國際研討會(全文海報發表)
標題Study of Morphology Poly Lactic Acid (PLA) films Surface after Microorganism Degradation by Scanning Electron Microscopy (SEM)
出版類型國際研討會(全文海報發表)
出版年度2010
AuthorsCHIU CHIU HSIA, 邱秋霞, Albert Linton Charles 邱亞伯, & Yuan-Kuang Guu 古源光
會議名稱第6屆台泰研討會
出版日期Nov 13 2010 12:0
會議地點Kasetsart University
其他編號0000
中文摘要

Poly lactic acid (PLA) is the first commodity polymer produced from annually renewable resources. There are several environmental benefits of PLA such as use of low energy to produce and reduce green house gas production.
Soil burial tests show that the degradation of PLA in soil is slow and that it takes a long time for degradation to start. These smaller molecules are then degraded into CO2 and H2O by microorganisms in the compost. In spite of the growing interests in PLA as a biodegradable material and as an ecologically useful alternative to plastics, studies on PLA degradation have focused on the morphology of Poly Lactic Acid (PLA) films and observation PLA of surfaces before and after degradation by microorganism using Scanning Electron Microscopy (SEM). The experiment was conducted using 250 ml Erlenmeyer flasks containing 100 ml of liquid basal medium with 0.1% (w/v) gelatin (Difco) and sterilized PLA film sheets (3x3 cm). Inoculated sample (1ml) was then added to the 100 ml liquid medium. The flasks were incubated at 30 ?C with shaking at 180 rpm for 30 days and the morphology of PLA films after degradation were studied by SEM. The film surfaces were smooth in the controls, in which there was no inoculation (A). Moreover, in the inoculated cultures, the surfaces became rough and hemispherical holes were formed. Apparently there was a difference between the control ?lm in the diameters of the holes formed. Different microorganisms (B-D) can degrade PLA films within 30 days in liquid medium.

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