Effect of biaxial stretching on the microstructure evolution, optical, mechanical and oxygen barrier properties of biodegradable poly(lactic acid) (PLA)/poly(butylene adipate-co-terephthalate) (PBAT) films
Abstract
The poly(butylene adipate-co-terephthalate) (PBAT)/poly(lactic acid) (PLA) films have been widely used due to their biological degradability and excellent comprehensive properties. However, the reports regarding biodegradable PLA/PBAT films are rather scarce. In this work, systematical investigations of biaxially stretched PLA/PBAT films were performed. Compared with unstretched films, the PLA/PBAT 75/25 films with the stretching ratio of 5 × 1 exhibited an improvement on the crystallinity of PLA from 6 % to 58.6 %. According to 2D-WAXS results, the orientation of the α crystal in the MD increased with the increase of the stretching ratio. The stretched films showed favorable barrier properties. The oxygen permeability (OP) of 2 × 2 PLA/PBAT 75/25 films shows a decrement of 22 % compared with that of the unstretched films. Interestingly, the uniaxially stretched PLA/PBAT 75/25 films exhibits increased surface roughness (Ra) for 3 × 1 film whereas decreased Ra for the 5 × 1 film, which could be related to the phase separation under stretching. The tensile strength in the machine direction (MD) of the PLA/PBAT 75/25 films was improved up to 51.6 MPa for 5 × 1 film, which is 45 % higher than that of unstretched counterpart. The stretched films exhibit excellent mechanical and barrier properties, which could be utilized in packaging industry with high potential.
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Cites
Research progress in toughening modification of poly(lactic acid)
Liu, H., & Zhang, J. (2011) · Journal of Polymer Science Part B: Polymer Physics · doi:10.1002/polb.22283 · Cited by 767 · see citing works
Zhao, X., Liu, J., Li, J., Liang, X., Zhou, W., & Peng, S. (2022) · International Journal of Biological Macromolecules · doi:10.1016/j.ijbiomac.2022.07.091 · Cited by 249 · see citing works
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- Authors
- Liu, X., Mo, Z., Cui, L., Yu, C., Zou, Z., Liu, Y., Zheng, W., & Tan, J.
- Affiliations
- Hunan University of Technology (CN)
- Corresponding author
- Cui, Lingna
- Liu, Yuejun
- Venue
- International Journal of Biological Macromolecules
- Publisher
- Elsevier BV
- Published
- 2023-12
- Volume
- 253
- Issue
- Pt 4
- Pages
- 126976
- ISSN
- 0141-8130 (ISSN-L)
- OpenAlex
- W4386893316
- Cited by
- 44
- References
- 2
- Citations by year
- 2026: 10 · 2025: 21 · 2024: 13
- FWCI
- 2.82
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- International Journal of Biological Macromolecules (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer crystallization and properties
- Physical Sciences › Materials Science › Biomaterials › Nanocomposite Films for Food Packaging
- Keywords
- biaxial stretching, polylactic acid, poly(butylene adipate-co-terephthalate), PLA/PBAT blends, biodegradable films, crystallinity, oxygen barrier properties, oxygen permeability, surface roughness, phase separation, tensile strength, packaging materials
- MeSH terms
- Adipates, Alkenes, Oxygen, Phthalic Acids, Polyesters, Food Packaging
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