Phase transitions and honeycomb morphology in an incompatible blend of enantiomeric polylactide block copolymers

Lu Sun; Jorge E. Ginorio; Lei Zhu; Igors Sics; Lixia Rong; Benjamin S. Hsiao

doi:10.1021/ma061115b

Phase transitions and honeycomb morphology in an incompatible blend of enantiomeric polylactide block copolymers

Lu Sun
, Jorge E. Ginorio
, Lei Zhu
, Igors Sics
, Lixia Rong
, Benjamin S. Hsiao

Chemistry

University of Connecticut
University of Puerto Rico
Stony Brook University

Research output: Contribution to journal › Review article › peer-review

15 Scopus citations

Abstract

Two-well defined enantiomeric polylactide (PLA) block copolymers were synthesized to find the phase transitions and honeycomb morphology in an incompatible blend of the PLA block copolymers. Quantitative stereocomplexes were obtained in an equimolar blend of PEO-b-PLLA and PEB-b-PDLA, where the PEO and PEB blocks were immiscible. SAXS and TEM techniques were used to observe the thermal history-dependent mesophase transitions in an incompatible blend of enantiomeric PLA block copolymers. The two morphologies in the melt were kinetics dependent where the lamellar morphology was kinetically favored while the honeycomb morphology was thermodynamically favored. The results show that the complementary chiral interaction between PLLA and PDLA played an important role in reaching the final morphology in the molten SC5K-EO2K blend.

Original language	English
Pages (from-to)	8203-8206
Number of pages	4
Journal	Macromolecules
Volume	39
Issue number	24
DOIs	https://doi.org/10.1021/ma061115b
State	Published - Nov 28 2006

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title = "Phase transitions and honeycomb morphology in an incompatible blend of enantiomeric polylactide block copolymers",

abstract = "Two-well defined enantiomeric polylactide (PLA) block copolymers were synthesized to find the phase transitions and honeycomb morphology in an incompatible blend of the PLA block copolymers. Quantitative stereocomplexes were obtained in an equimolar blend of PEO-b-PLLA and PEB-b-PDLA, where the PEO and PEB blocks were immiscible. SAXS and TEM techniques were used to observe the thermal history-dependent mesophase transitions in an incompatible blend of enantiomeric PLA block copolymers. The two morphologies in the melt were kinetics dependent where the lamellar morphology was kinetically favored while the honeycomb morphology was thermodynamically favored. The results show that the complementary chiral interaction between PLLA and PDLA played an important role in reaching the final morphology in the molten SC5K-EO2K blend.",

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T1 - Phase transitions and honeycomb morphology in an incompatible blend of enantiomeric polylactide block copolymers

AU - Sun, Lu

AU - Ginorio, Jorge E.

AU - Zhu, Lei

AU - Sics, Igors

AU - Rong, Lixia

AU - Hsiao, Benjamin S.

PY - 2006/11/28

Y1 - 2006/11/28

N2 - Two-well defined enantiomeric polylactide (PLA) block copolymers were synthesized to find the phase transitions and honeycomb morphology in an incompatible blend of the PLA block copolymers. Quantitative stereocomplexes were obtained in an equimolar blend of PEO-b-PLLA and PEB-b-PDLA, where the PEO and PEB blocks were immiscible. SAXS and TEM techniques were used to observe the thermal history-dependent mesophase transitions in an incompatible blend of enantiomeric PLA block copolymers. The two morphologies in the melt were kinetics dependent where the lamellar morphology was kinetically favored while the honeycomb morphology was thermodynamically favored. The results show that the complementary chiral interaction between PLLA and PDLA played an important role in reaching the final morphology in the molten SC5K-EO2K blend.

AB - Two-well defined enantiomeric polylactide (PLA) block copolymers were synthesized to find the phase transitions and honeycomb morphology in an incompatible blend of the PLA block copolymers. Quantitative stereocomplexes were obtained in an equimolar blend of PEO-b-PLLA and PEB-b-PDLA, where the PEO and PEB blocks were immiscible. SAXS and TEM techniques were used to observe the thermal history-dependent mesophase transitions in an incompatible blend of enantiomeric PLA block copolymers. The two morphologies in the melt were kinetics dependent where the lamellar morphology was kinetically favored while the honeycomb morphology was thermodynamically favored. The results show that the complementary chiral interaction between PLLA and PDLA played an important role in reaching the final morphology in the molten SC5K-EO2K blend.

UR - https://www.scopus.com/pages/publications/33846176034

U2 - 10.1021/ma061115b

DO - 10.1021/ma061115b

M3 - Review article

AN - SCOPUS:33846176034

SN - 0024-9297

VL - 39

SP - 8203

EP - 8206

JO - Macromolecules

JF - Macromolecules

IS - 24

ER -

Phase transitions and honeycomb morphology in an incompatible blend of enantiomeric polylactide block copolymers

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