Novel chemical recycling of poly(L-lactic acid) using montmorillonite K10

Kohei Okamoto, Kazunobu Toshima, Shuichi Matsumura

Research output: Contribution to conferencePaperpeer-review


In order to establish the sustainable chemical recycling process of poly(L-lactic acid), poly(L-lactic acid) with a molecular weight of 100,000 was transformed into the corresponding lactate oligomers having a molecular weight of few hundreds by using environmentally benign solid acids, such as Montmorillonite K10. Oligomerization reaction was independent of the polymer concentration in toluene. The oligomer could be repolymerized by the conventional chemical catalysts forming a high molecular weight poly(L-lactic acid). It was confirmed that the chemical recycling process was a stereoretention process.

Original languageEnglish
Number of pages1
Publication statusPublished - 2005 Dec 1
Event54th SPSJ Annual Meeting 2005 - Yokohama, Japan
Duration: 2005 May 252005 May 27


Other54th SPSJ Annual Meeting 2005


  • Chemical recycling
  • Montmorillonite K10
  • Oligomer
  • Poly(L-lactic acid)
  • Solid acid

ASJC Scopus subject areas

  • Engineering(all)


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