Epitaxial crystallization and crystalline polymorphism of polylactides

L. Cartier; T. Okihara; Y. Ikada; H. Tsuji; J. Puiggali; B. Lotz

doi:10.1016/S0032-3861(00)00234-2

Epitaxial crystallization and crystalline polymorphism of polylactides

L. Cartier, T. Okihara, Y. Ikada, H. Tsuji, J. Puiggali, B. Lotz

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

483 Citations (Scopus)

Abstract

Two crystal phases of poly(L-lactide) and that of the racemate of poly(L-lactide) and poly(D-lactide) can be grown epitaxially on one and the same crystalline substrate, hexamethylbenzene (HMB), which had been shown by Zwiers et al. to form a eutectic with these polymers. The stable α-crystal modification of the optically active polymer, based on a 10₃ helix conformation (for PDLA; 10₇ for PLLA), is obtained for T_c near 155 °C. A new crystal modification is produced by epitaxial crystallization at slightly lower T_c (≈140 °C). The crystal structure of this new form is established by electron diffraction and packing energy analysis. Two antiparallel helices are packed in an orthorhombic unit-cell of parameters a = 9.95 angstroms, b = 6.25 angstroms and c = 8.8 angstroms. The racemate of poly(L-lactide) and poly(D-lactide) also crystallize epitaxially (at ≈165 °C) on HMB, which appears to be a very versatile substrate.

Original language	English
Pages (from-to)	8909-8919
Number of pages	11
Journal	polymer
Volume	41
Issue number	25
DOIs	https://doi.org/10.1016/S0032-3861(00)00234-2
Publication status	Published - Sept 8 2000
Externally published	Yes

Keywords

Crystal structure
Epitaxy
Polylactide

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Materials Chemistry

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10.1016/S0032-3861(00)00234-2

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title = "Epitaxial crystallization and crystalline polymorphism of polylactides",

abstract = "Two crystal phases of poly(L-lactide) and that of the racemate of poly(L-lactide) and poly(D-lactide) can be grown epitaxially on one and the same crystalline substrate, hexamethylbenzene (HMB), which had been shown by Zwiers et al. to form a eutectic with these polymers. The stable α-crystal modification of the optically active polymer, based on a 103 helix conformation (for PDLA; 107 for PLLA), is obtained for Tc near 155 °C. A new crystal modification is produced by epitaxial crystallization at slightly lower Tc (≈140 °C). The crystal structure of this new form is established by electron diffraction and packing energy analysis. Two antiparallel helices are packed in an orthorhombic unit-cell of parameters a = 9.95 angstroms, b = 6.25 angstroms and c = 8.8 angstroms. The racemate of poly(L-lactide) and poly(D-lactide) also crystallize epitaxially (at ≈165 °C) on HMB, which appears to be a very versatile substrate.",

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T1 - Epitaxial crystallization and crystalline polymorphism of polylactides

AU - Cartier, L.

AU - Okihara, T.

AU - Ikada, Y.

AU - Tsuji, H.

AU - Puiggali, J.

AU - Lotz, B.

PY - 2000/9/8

Y1 - 2000/9/8

N2 - Two crystal phases of poly(L-lactide) and that of the racemate of poly(L-lactide) and poly(D-lactide) can be grown epitaxially on one and the same crystalline substrate, hexamethylbenzene (HMB), which had been shown by Zwiers et al. to form a eutectic with these polymers. The stable α-crystal modification of the optically active polymer, based on a 103 helix conformation (for PDLA; 107 for PLLA), is obtained for Tc near 155 °C. A new crystal modification is produced by epitaxial crystallization at slightly lower Tc (≈140 °C). The crystal structure of this new form is established by electron diffraction and packing energy analysis. Two antiparallel helices are packed in an orthorhombic unit-cell of parameters a = 9.95 angstroms, b = 6.25 angstroms and c = 8.8 angstroms. The racemate of poly(L-lactide) and poly(D-lactide) also crystallize epitaxially (at ≈165 °C) on HMB, which appears to be a very versatile substrate.

AB - Two crystal phases of poly(L-lactide) and that of the racemate of poly(L-lactide) and poly(D-lactide) can be grown epitaxially on one and the same crystalline substrate, hexamethylbenzene (HMB), which had been shown by Zwiers et al. to form a eutectic with these polymers. The stable α-crystal modification of the optically active polymer, based on a 103 helix conformation (for PDLA; 107 for PLLA), is obtained for Tc near 155 °C. A new crystal modification is produced by epitaxial crystallization at slightly lower Tc (≈140 °C). The crystal structure of this new form is established by electron diffraction and packing energy analysis. Two antiparallel helices are packed in an orthorhombic unit-cell of parameters a = 9.95 angstroms, b = 6.25 angstroms and c = 8.8 angstroms. The racemate of poly(L-lactide) and poly(D-lactide) also crystallize epitaxially (at ≈165 °C) on HMB, which appears to be a very versatile substrate.

KW - Crystal structure

KW - Epitaxy

KW - Polylactide

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Epitaxial crystallization and crystalline polymorphism of polylactides

Abstract

Keywords

ASJC Scopus subject areas

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