Chemical recycling of lactic acid based polymer using a solid acid

Yota Tsuneizumi, 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), degradation of a polymer blend of poly(L-lactic acid) (PLLA) and polyethylene was studied. PLLA was selectively degraded into the corresponding lactate oligomers having a molecular weight of few hundreds in toluene by using environmentally benign solid acid, montmorillonite K5. The oligomer was repolymerized by the conventional chemical catalysts forming a high molecular weight PLLA. It was also confirmed that the repolymerized product showed the same Tm as that obtained by the polymerization of the authentic L-lactic acid.

Original languageEnglish
Number of pages1
Publication statusPublished - 2006 Oct 19
Event55th SPSJ Annual Meeting - Nagoya, Japan
Duration: 2006 May 242006 May 26


Other55th SPSJ Annual Meeting


  • Chemical recycling
  • Degradation
  • Oligomer
  • Poly(L-lactic acid) montmorillonite
  • Solid acid

ASJC Scopus subject areas

  • Engineering(all)


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