Effect of nucleation and plasticization on the stereocomplex formation between enantiomeric poly(lactic acid)s

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DOIResolve DOI: http://doi.org/10.1016/j.polymer.2013.08.031
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TypeArticle
Journal titlePolymer (United Kingdom)
ISSN0032-3861
Volume54
Issue21
Pages57625770; # of pages: 9
SubjectCrystalline morphologies; Crystallization behavior; Heterogeneous nucleation; High melting point; Isothermal crystallization temperature; Spherulitic morphology; Stereocomplex formation; Stereocomplexes; Blending; Complexation; Crystallization kinetics; Differential scanning calorimetry; Lactic acid; Morphology; Optical data storage; Optical microscopy; Polypropylenes; Nucleation
AbstractThe effect of nucleation and plasticization on the stereocomplex formation between poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) was investigated in blends where PDLA is added as a minor phase in a major phase of PLLA. The use of small amounts of PDLA is aimed at creating a high melting point stereocomplex phase that in turn can serve as nucleating agent for the major phase of PLLA. Blends containing 5% PDLA with talc or organic phosphonate as nucleants and polyethylene glycol as plasticizer were prepared via melt-blending. Their crystallization behavior was investigated through Differential Scanning Calorimetry (DSC) using various thermal histories. Two peculiar stereocomplex melting endotherms were found. The peak temperature and enthalpy of these two endotherms were correlated to prior isothermal crystallization temperature. The different endotherms were also associated with two different crystalline morphologies observed by optical microscopy and referred to as Network and Spherulitic morphologies. The influence of plasticization and of heterogeneous nucleation on these morphologies was investigated through optical microscopy and calorimetric observations. © 2013 Elsevier Ltd. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270697
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Record identifier7be08d47-e5cf-4b4a-8530-0c087913df9f
Record created2014-02-17
Record modified2016-05-09
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