Helix Distortion and Crystal Structure of the α-Form of Poly(l-lactide)

Sasaki, S.; Asakura, T.

doi:10.1021/ma0348674

Cited by 297Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesCrystal structures of chemical compounds

Helix Distortion and Crystal Structure of the α-Form of Poly(l-lactide)

Sasaki, S., Asakura, T.·2003·Macromolecules

DOI 10.1021/ma0348674

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Abstract

The crystal structure of the α-form of poly( l -lactide) was analyzed by the linked-atom least-squares refinements for the X-ray fiber diffraction data. The space group was orthorhombic P 2 1 2 1 2 1, and the unit cell contained the antiparallel two chains. The chain conformation was the 2-fold s(15*2/7) helix distorted periodically from the regular s(3*10/7) helix. The ester groups were deformed from the planar trans conformation. Potential energy calculations suggested that the periodic chain distortion resulted from the impartial stress distribution due to the interchain interactions.

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The very strong WAXS peak at 2θ=15.0° corresponds closely to the 110/1-10/200 reflections at 2θ=15.083° and 15.093° of the α form of PLLA.
“The very strong peak at 2 y ¼ 15.0 8 corresponds closely to the 110 = 1 10 = 200 reflections at 2 y ¼ 15.083 and 15.093 8”
From Melt Structure and its Transformation by Sequential Crystallization of the Two Blocks within Poly( <scp>L</scp> ‐lactide)‐ block ‐Poly( ε ‐caprolactone) Double Crystalline Diblock Copolymers (2006) · cites this paper as [26]
The WAXS peak at 2θ=17.1° is close to the position expected for the 113 and 203 reflections of the α form of PLLA (2θ=17.259° and 17.268°).
“The next peak at 2 y ¼ 17.1 8 is close to the position expected for the sets of 113 and 203 reflections of the a form of PLLA, 2 y ¼ 17.259 8 and 2 y ¼ 17.268 8 . [26]”
From Melt Structure and its Transformation by Sequential Crystallization of the Two Blocks within Poly( <scp>L</scp> ‐lactide)‐ block ‐Poly( ε ‐caprolactone) Double Crystalline Diblock Copolymers (2006) · cites this paper as [26]
The first WAXS peak at 2θ=13.3° is assigned to the 0-11/011 reflections of PLLA.
“The first peak at 2 y ¼ 13.3 8 is assigned to the 0 11 = 011 reflections of PLLA.”
From Melt Structure and its Transformation by Sequential Crystallization of the Two Blocks within Poly( <scp>L</scp> ‐lactide)‐ block ‐Poly( ε ‐caprolactone) Double Crystalline Diblock Copolymers (2006) · cites this paper as [26]

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Authors: Sasaki, S., & Asakura, T.
Affiliations: Japan Advanced Institute of Science and Technology (JP)
Corresponding author: Sasaki, S.
Venue: Macromolecules
Publisher: American Chemical Society (ACS)
Published: 2003-10-04
Volume: 36
Issue: 22
Pages: 8385-8390
ISSN: 0024-9297 (ISSN-L)
1520-5835
DOI: 10.1021/ma0348674
OpenAlex: W2072024118
Cited by: 296
References: 35
Citations by year: 2026: 7 · 2025: 8 · 2024: 11 · 2023: 22 · 2022: 22 · 2021: 18 · 2020: 15 · 2019: 20 · 2018: 15 · 2017: 21 · 2016: 18 · 2015: 17 · 2014: 9 · 2013: 22 · 2012: 19
FWCI: 4.55
Type: journal article
Language: en
Open access: closed
Locations: Macromolecules (publishedVersion)
Topics: Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
Physical Sciences › Chemistry › Inorganic Chemistry › Crystal structures of chemical compounds
Keywords: poly(L-lactic acid), α-form, helix distortion, crystal structure, interchain interactions, stress distribution, potential energy calculations

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Helix Distortion and Crystal Structure of the α-Form of Poly(l-lactide)

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