Formation of extended ionomeric network by bulk polymerization of L,D-lactide with layered-double-hydroxide

Edward D. Mccarthy, Mauro Zammarano, Douglas M. Fox, Ryan C. Nieuwendaal, Yeon S. Kim, Paul H. Maupin, Paul C. Trulove, Jeffrey W. Gilman

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We report the formation of an ionomeric network in a poly(L,D-lactide) hybrid nanocomposite, (PLDLAHYB) during in-situ melt polymerization of L,D-lactide in the presence of magnesium/aluminum layered double-hydroxide (LDH) without added catalyst. The effect of LDH mass loading and reaction time on molecular mass and yield of soluble poly(L,D-lactide) (PLDLA-SOL) present in the hybrid was investigated for a better understanding of the conflicting roles of LDH in polymerization and degradation of PLDLA-SOL. High molecular mass PLDLA-SOL is obtained through initiation of polymerization by LDH. However an additional insoluble organiceinorganic fraction, INSOL, is also observed within the product when PLDLA-SOL is extracted using methylene chloride as solvent. It is proposed that INSOL is an ionomeric network comprising hydrogen-bonded, or otherwise coordinated, lactic acid monomer salts of magnesium, together with PLDLA in a 24%e76% mass ratio.
Original languageEnglish
Article number0032-3861
Pages (from-to)90-101
Number of pages21
Issue number1
Early online date22 Nov 2012
Publication statusPublished - 8 Jan 2013

Keywords / Materials (for Non-textual outputs)

  • polylactic acid
  • polymerisation
  • ring opening polymerisation
  • layered double hydroxide
  • ionomer
  • network formation


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