비의류제품

Polyethers -- Biodegradability and Chemical Structure.

  • 출판일1994.02
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 449
Researchers measured the biodegradability of various polyethers by examining the growth rates of bacteria that consume polyethylene glycol (PEG) and polypropylene glycol (PPG). The researchers used activated sludges that were taken from municipal sewage plants throughout Japan. Analysis showed that the biodegradability of the polyethers depended on the presence of free terminal groups. PEG and PPG breakdown data indicated that metabolism occurred exogenously at the end of the molecular chain. Dehydrogenase tests confirmed that PEG and PPG units with molecular weights as high as 50,000 could be metabolized, but at rates too slow to support bacterial growth. The upper limit of PEG and PPG molecular weights for practical becteriological assimilation ranged from 20,000 to 30,000. 10 refs.
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