Crystallization behavior and crystalline structural changes of poly(glycolic acid) investigated via temperature-variable WAXD and FTIR analysis
Abstract
Poly(glycolic acid) (PGA) is a unique biodegradable, aliphatic polyester having a higher melting point (Tm) and better mechanical properties and chemical resistance than its analogs. The unusual physical properties of PGA can be attributed to its crystalline structure, chain packing and interactions. Herein, we systematically investigated the crystalline structure, spherulitic morphology, and structural evolution of PGA in the crystallization and melting processes by time-resolved wide-angle X-ray diffraction (WAXD) and FTIR spectrometry. PGA exhibits fast crystallization and it completely crystallizes in the fast cooling process. The Tm, degree of crystallinity, and long period of PGA increase as the crystallization temperature increases. PGA forms unique hedrites but not normal spherulites during crystallization. Because of the thermal expansion of the crystal lattice, the a and b axes of PGA crystal cells increase linearly with temperature in the heating process. The band splitting in the FTIR spectrum of PGA is observed in the ν(CO) and δ(CH2) regions and the spectral splitting intensifies with cooling, indicating the existence of intermolecular dipolar interactions in PGA crystals. It is speculated that the C–H⋯OC H-bonds are formed in the crystalline phase of PGA, as indicated by the significant red shifts of the ν(CO) band during crystallization.
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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 [35]
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Preparation and Rheological Characterization of Long Chain Branching Polyglycolide
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Exploring marine and psychrophilic bacteria for biosurfactant production and oil spill mitigation
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Cyclic polyglycolide by means of metal acetylacetonates
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Biodegradation and Compostability of Sustainable Polymers
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A colorimetric glucose sensor with gradient porous polyglycolic acid (PGA) microneedle array patch
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- Authors
- Yu, C., Bao, J., Xie, Q., Shan, G., Bao, Y., & Pan, P.
- Affiliations
- State Key Laboratory of Chemical Engineering (CN)
- Corresponding author
- Pan, Pengju
- Venue
- CrystEngComm
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2016
- Volume
- 18
- Issue
- 40
- Pages
- 7894-7902
- ISSN
- 1466-8033 (ISSN-L)
- OpenAlex
- W2519471234
- Cited by
- 98
- References
- 39
- Citations by year
- 2026: 13 · 2025: 22 · 2024: 17 · 2023: 14 · 2022: 10 · 2021: 9 · 2020: 5 · 2019: 3 · 2018: 2 · 2017: 3
- FWCI
- 1.82
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- CrystEngComm (publishedVersion)
- Funders
- National Natural Science Foundation of China (21422406)
- 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, crystallization behavior, crystal structure, spherulitic morphology, melting behavior, crystallinity, long period, C-H⋯O hydrogen bonds, biodegradable aliphatic polyesters, chain packing
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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
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