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

doi:10.1021/acs.macromol.0c00234

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

Department of Chemical Engineering

Research output: Contribution to journal › Article › peer-review

10 Citations (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 T_c 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 language	English
Pages (from-to)	2157-2168
Number of pages	12
Journal	Macromolecules
Volume	53
Issue number	6
DOIs	https://doi.org/10.1021/acs.macromol.0c00234
Publication status	Published - 2020 Mar 24

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/acs.macromol.0c00234

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

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.",

author = "Chen, {Hsin Ping} and Selvaraj Nagarajan and Woo, {Eamor M.}",

note = "Funding Information: This work was financially supported by a basic research grant (MOST 105-2221-E-006-246-MY3 and MOST-108-2221-E006-055) funded by the Ministry of Science and Technology (MOST) of Taiwan. Publisher Copyright: Copyright {\textcopyright} 2020 American Chemical Society.",

year = "2020",

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doi = "10.1021/acs.macromol.0c00234",

language = "English",

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AU - Chen, Hsin Ping

AU - Nagarajan, Selvaraj

AU - Woo, Eamor M.

N1 - Funding Information: This work was financially supported by a basic research grant (MOST 105-2221-E-006-246-MY3 and MOST-108-2221-E006-055) funded by the Ministry of Science and Technology (MOST) of Taiwan. Publisher Copyright: Copyright © 2020 American Chemical Society.

PY - 2020/3/24

Y1 - 2020/3/24

N2 - 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.

AB - 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.

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

Abstract

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