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

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), a high molecular weight poly(L-lactic acid) was transformed into the corresponding lactate oligomers having a molecular weight of few hundreds by using environmentally benign solid acids, such as montmorillonite K10. The oligomer was repolymerized by the conventional chemical catalysts forming a high molecular weight poly(L-lactic acid). It was also confirmed that the repolymerized product showed the same Tm as that obtained by the polymerization of the authentic L-lactic acid. This chemical recycling process was applicable to poly[(L-lactic acid)/( ε -caprolactone)] copolymer.

Original languageEnglish
Number of pages2
Publication statusPublished - 2005 Dec 1
Event54th SPSJ Symposium on Macromolecules - Yamagata, Japan
Duration: 2005 Sept 202005 Sept 22


Other54th SPSJ Symposium on Macromolecules


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

ASJC Scopus subject areas

  • General Engineering


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