Evidence of a dual network/spherulitic crystalline morphology in PLA stereocomplexes

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DOIResolve DOI: http://doi.org/10.1016/j.polymer.2012.10.030
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TypeArticle
Journal titlePolymer
ISSN00323861
Volume53
Issue25
Pages58165824
SubjectPLA; Stereocomplex; Crystallization
AbstractStereocomplex formation between poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) in the melt state was investigated. Blends with up to 5% PDLA were prepared via melt-blending and characterized by rheological, calorimetric, X-ray diffraction (XRD) and optical microscopy techniques. Kinetic studies suggest that the stereocomplex formation half-time (t1/2) is in the range of 5–7 min. The nucleating role of the stereocomplex for PLA homocrystallization was demonstrated in XRD experiment and in optical microscopy observations through an increase in the spherulite density as well as the growth of a transcrystalline layer on stereocomplex spherulites. More interestingly, a dual crystalline morphology for PLA stereocomplex comprising a spherulitic and a network structure was revealed by optical microscopy observations. This complex morphology was associated to a double stereocomplex melting peak behavior observed after isothermal crystallization in DSC as well as to a huge viscosity increase observed in the presence of a small concentration of stereocomplex in a PLLA melt.
Publication date
LanguageEnglish
AffiliationAutomotive and Surface Transportation; National Research Council Canada
Peer reviewedYes
IdentifierS0032386112008865
NPARC number21268842
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Record identifier250a738e-67e9-4aef-a979-c6752b3a2419
Record created2013-11-14
Record modified2016-05-09
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