McCarthy, E.
, Zammarano, M.
, Fox, D.
, Nieuwendaal, R.
, Kim, Y.
, Maupin, P.
, Trulove, P.
and Gilman, J.
(2012),
Formation of Extended Ionomeric Network by Bulk Polymerization of L,D-lactide with Layered Double Hydroxide, Polymer, [online], https://doi.org/10.1016/j.polymer.2012.11.037
(Accessed April 24, 2024)
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Formation of Extended Ionomeric Network by Bulk Polymerization of L,D-lactide with Layered Double Hydroxide
Published
Author(s)
, , Douglas M. Fox, , , P H. Maupin, Paul C. Trulove,
Abstract
We report the formation of an ionomeric network in a poly(L,D-lactide) hybrid nanocomposite, (PLDLA-HYB) during in-situ melt polymerization of L,D lactide in the presence of magnesium/aluminium 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 organic-inorganic 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 co-ordinated, lactic acid monomer salts of magnesium, together with PLDLA in a 30 % to 70 % mass ratio.Citation
Polymer
Pub Type
Journals
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Keywords
Nanocomposite, polylactide, layered double hydroxide, polymer, interface
Citation
Created November 21, 2012, Updated October 12, 2021