Morphological and Kinetic Analyses of Regime Transition for Poly[(S)-lactide] Crystal Growth
Abstract
Regime transitions of poly[(S)-lactide] (PLA) crystal growth from the melt were investigated by studying the morphological changes and carrying out kinetic analysis using microscopic techniques. PLA thin films with an average layer thickness of 100 nm were isothermally crystallized at a given crystallization temperature after melting at 220 degrees C. Following isothermal crystallization at a temperature below 145 degrees C, uniform two-dimensional spherulites having stacked flat-on lamellar texture were developed throughout the PLA thin films. On the basis of electron diffraction analysis for two-dimensional spherulites of PLA, it was found that the average growth direction of an individual lamellar crystal was parallel to the crystallographic b axis. At temperatures above 150 degrees C, hexagonal lamellar crystals were formed from the melt. Electron diffractograms of these lamellae showed that the crystal had orthogonal packing of PLA molecules and a truncated-lozenge-shaped growth behavior. The growth surfaces of the hexagonal crystal were parallel to either the crystallographic (110) or the (100) plane. The PLA crystal growth rate along the b axis direction was evaluated at various crystallization temperatures of the thin films. Kinetic analysis of crystal growth in the PLA thin film demonstrated that the regime transitions of PLA crystal growth, from regime III to regime II and from regime II to regime I, occur at around 120 and 147 degrees C, respectively. The transitio…
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The spherulitic growth rate of PLLA crystals formed at identical temperatures decreased as the molecular weight increased.
“The spherulitic growth rate of PLLA crystals formed at identical temperatures decreased as the molecular weight increased.”
From Crystallization Kinetics and Morphology of Biodegradable Double Crystalline PLLA- <i>b</i> -PCL Diblock Copolymers (2010) · cites this paper as [71]
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- Authors
- Abe, H., Kikkawa, Y., Inoue, Y., & Doi, Y.
- Affiliations
- Tokyo Institute of Technology (JP)
- Venue
- Biomacromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2001-07-27
- Volume
- 2
- Issue
- 3
- Pages
- 1007-1014
- ISSN
- 1525-7797 (ISSN-L)
- 1526-4602
- OpenAlex
- W2053725265
- Cited by
- 179
- References
- 5
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 2 · 2023: 7 · 2022: 9 · 2021: 6 · 2020: 2 · 2019: 7 · 2018: 8 · 2017: 9 · 2016: 8 · 2015: 5 · 2014: 7 · 2013: 15 · 2012: 10
- FWCI
- 3.21
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Biomacromolecules (publishedVersion)
- PubMed (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 › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
- Keywords
- crystal growth, tipping points, isothermal crystallization, thin films, lamellar stacking, crystal growth rate, crystallization kinetics, crystal morphology, growth orientation
- MeSH terms
- Biocompatible Materials, Biodegradation, Environmental, Crystallization, Kinetics, Microscopy, Electron, Polyesters, Temperature, Molecular Structure, Microscopy, Atomic Force, Macromolecular Substances
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