Unusual Radiating-Stripe Morphology in Nonequimolar Mixtures of Poly(l -lactic acid) with Poly(d -lactic acid)

Hsin Ping Chen, Selvaraj Nagarajan, Eamor M. Woo

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1 Citation (Scopus)

Abstract

Extensive microscopic and thermal analyses and X-ray diffraction characterizations are conducted to investigate an unusual morphology and its evolution in extreme nonequimolar mixtures of poly(L-lactic acid)(PLLA) with poly(D-lactic acid) (PDLA) containing a trace amount of stereocomplex crystals. Radiating-stripe spherulites are crystallized on first-grown PLLA/PDLA sc-crystals that act as template substrates for later-grown PLLA. Growth kinetics are analyzed to attempt interpretations on understanding why the unusual PLLA morphology with distinct large radiating dendrites can be packed only in narrow ranges of nonequimolar PLLA/PDLA = 98/2 to 90/10 mixtures and only when crystallized within a suitable Tc range of 125-140 °C. Additionally, the interior lamellar assembly for the radiating-stripe PLLA spherulites is dissected to correlate with this unusual morphology with rodlike optical birefringence patterns.

Original languageEnglish
Pages (from-to)2157-2168
Number of pages12
JournalMacromolecules
Volume53
Issue number6
DOIs
Publication statusPublished - 2020 Mar 24

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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