Study on degradation behavior of commercially available biodegradable plastic bags
The most widely used poly(butylene adipate-co-terephthalate)(PBAT)/polylactic acid(PLA)/starch(St)biode-gradable plastic bags in the market with the mass fractions of PBAT and St of 20%and 30%,respectively,were selected as the research objects to investigate their long-term degradation behavior in air,water,acid-base solutions,natural soil and organic soil.The results showed that the biodegradable plastic bags prepared from pure PBAT and PBAT/PLA/St showed a rapid de-crease in mechanical properties after 54 weeks of degradation in air,water,acid-base solutions,natural soil,and organic soil,but still had high relative molecular mass and did not exhibit the expected excellent biodegradability;alkaline environments were more conducive to the fragmentation and degradation of biodegradable plastic bags as compared to acidic environments;the higher the content of St component was in biodegradable plastic bags,the more pores appeared in the plastic bags under the same degra-dation cycles and the greater the relative molecular mass decreased;and biodegradable plastic bags prepared from pure PBAT were beneficial to bacterial growth in acidic environments,but their degradation effect was limited.
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