A β-Form Crystal Modification of Poly(glycolic acid): Formation, Stabilization, and β–α Transition
Abstract
Polymorphism is one of the fascinating characteristics of polymer crystallization. In this work, we report a new crystal modification of poly(glycolic acid) (PGA), the β- form, to be distinguished from the already known α-form PGA crystal reported in 1968. The β-form with a relatively high amount ( X β = 43%) is obtained during isothermal crystallization in a particular temperature domain, i.e., T c around 60 °C, after prestretching the amorphous samples. The orientation of PGA amorphous chains is expected to better fit the chain conformation in the β-form, i.e., two chains each with a 7/2 helical conformation in the unit cell, and thus, the extended PGA macromolecules feature a lower energy barrier for β-form formation (Δ G β ) than that of the α-form (Δ G α ). Moreover, the low crystallization temperature could not provide the extended macromolecules enough energy to overcome the higher Δ G α, thus forming predominantly the β-form. The β-form is stable at ambient temperatures, but it is a metastable crystal modification at elevated temperatures compared to the α-form. Consequently, an obvious β–α transition occurs in the temperature range of 80–120 °C via a solid–solid mechanism, while the crystalline orientation degree remains consistent during the transition. This study enables a better understanding on the polymorphism and phase transition of PGA, providing a potential route to tune its final performance via crystalline structure control.
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The WAXD peaks at 2θ = 22.2° and 28.9° corresponded to the (110) and (020) crystallographic planes of the α-form of PGA crystal.
“these peaks corresponded to the (110) and (020) crystallographic planes of the α-form of PGA crystal [34,35].”
From A Novel Polytetrahydrofuran-Based Shape Memory Polyurethane Enhanced by Polyglycolide-Block-Polytetrahydrofuran-Block-Polyglycolide Copolymer (2024) · cites this paper as [34]
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Li, X., Mao, L., Li, W., Wu, H., Dai, S., Xiao, R., Huang, J., Liu, G., Yang, K., Bu, W., et al. (2024) · Polymers · doi:10.3390/polym16243610 · Cited by 1 · see citing works
“PU-GT-0 minor di ff raction peaks at 2 θ = 22.2° and 28.9°, and these peaks corresponded to and (020) crystallographic planes the α -form of PGA crystal [34,35].”
Influential
- Authors
- Niu, D., Wang, H., Ma, Y., Xu, P., Li, J., Yang, W., Liu, T., Tashiro, K., Lemstra, P. J., & Ma, P.
- Affiliations
- Jiangnan University (CN)
- Dalian University of Technology (CN)
- Toyota Technological Institute (JP)
- Corresponding author
- Ma, Piming
- ORCID
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2023-08-10
- Volume
- 56
- Issue
- 16
- Pages
- 6316-6327
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W4385720450
- Cited by
- 40
- References
- 53
- Citations by year
- 2026: 8 · 2025: 15 · 2024: 15 · 2023: 2
- FWCI
- 3.05
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Macromolecules (publishedVersion)
- Funders
- Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars (BK20200027)
- National Natural Science Foundation of China (52073123, 52103032)
- 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
- polyglycolic acid, β-form crystals, polymorphism, crystal modifications, solid-solid phase transition, isothermal crystallization, prestretching, chain orientation, metastable crystals, crystallization temperature
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