Isothermal crystallization behavior of poly(L‐lactide) in poly(L‐lactide)‐block‐poly(ethylene glycol) diblock copolymers
Abstract
The crystal unit‐cell structures and the isothermal crystallization kinetics of poly(L‐lactide) in biodegradable poly(L‐lactide)‐block‐methoxy poly(ethylene glycol) (PLLA‐b‐MePEG) diblock copolymers have been analyzed by wide‐angle X‐ray diffraction and differential scanning calorimetry. In particular, the effects due to the presence of MePEG that is chemically connected to PLLA as well as the PLLA crystallization temperature TC are examined. Though we observe no variation of both the PLLA and MePEG crystal unit‐cell structures with the block ratio between PLLA and MePEG and TC, the isothermal crystallization kinetics of PLLA is greatly influenced by the presence of MePEG that is connected to it. In particular, the equilibrium melting temperature of PLLA, T, significantly decreases in the diblock copolymers. When the TC is high so that the crystallization is controlled by nucleation, because of the decreasing T and thereafter the nucleation density with decreasing PLLA molecular weight, the crystallinity of PLLA also decreases with a decrease in the PLLA molecular weight. While, for the lower crystallization temperature regime controlled by the growth mechanism, the crystallizability of PLLA in copolymers is greater than that of pure PLLA. This suggests that the activation energy for the PLLA segment diffusing to the crystallization site decreases in the diblocks. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2438–2448, 2006
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PLLA, PCL, and PE crystallize in orthorhombic unit cells and PEO in a monoclinic one.
“According to the literature, PLLA, PCL, and PE crystallize in orthorhombic unit26,27,63 cells and PEO in a monoclinic27 one.”
From Sequential Crystallization and Multicrystalline Morphology in PE- <i>b</i> -PEO- <i>b</i> -PCL- <i>b</i> -PLLA Tetrablock Quarterpolymers (2021) · cites this paper as [63]
The crystal unit cell dimensions of PLLA, PCL, PEO, and PE are as reported in the literature.
“The crystal unit cell dimensions are the following: a = 10.56 Å, b = 6.05 Å, and c = 28.90 Å for PLLA;63 a = 7.48 Å, b = 4.98 Å, and c = 17.26 Å for PCL;64 a = 7.96 Å, b = 13.11 Å, c = 19.39 Å (chain direction), and β = 124°48′ for PEO;65 and a = 7.40 Å, b = 4.96 Å, and c = 2.53 Å for PE.66”
From Sequential Crystallization and Multicrystalline Morphology in PE- <i>b</i> -PEO- <i>b</i> -PCL- <i>b</i> -PLLA Tetrablock Quarterpolymers (2021) · cites this paper as [63]
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- Authors
- Huang, C., Tsai, S., & Chen, C.
- Affiliations
- National Taiwan University (TW)
- National Taiwan University of Science and Technology (TW)
- Corresponding author
- Huang, Ching‐I
- ORCID
- Chen, Chih‐Ming
- Venue
- Journal of Polymer Science Part B: Polymer Physics
- Publisher
- Wiley
- Published
- 2006-07-26
- Volume
- 44
- Issue
- 17
- Pages
- 2438-2448
- ISSN
- 0887-6266 (ISSN-L)
- 1099-0488
- OpenAlex
- W1965101146
- Cited by
- 45
- References
- 38
- Citations by year
- 2025: 1 · 2024: 3 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 2 · 2017: 5 · 2016: 3 · 2015: 4 · 2014: 3 · 2013: 1 · 2012: 4
- FWCI
- 1.72
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Polymer Science Part B Polymer Physics (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 › Block Copolymer Self-Assembly
- Keywords
- poly(L-lactic acid), diblock copolymers, isothermal crystallization kinetics, crystallization temperature, equilibrium melting temperature, crystallinity, activation energy, biodegradable polymers, molecular weight effects
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