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The coupling effect of cellulose nanocrystal and strong shear field achieved the strength and toughness balance of Polylactide
Abstract
Up to now, unbalanced mechanical properties and poor heat resistance have become two major problems of polylactic acid (PLA). In this study, the coupling between Cellulose nanocrystal (CNC) and strong shearing field formed a unique hierarchical structure. Compared with pure PLA, the tensile strength of DPIM PLA/CNC increased from 57.9 MPa to 79.6 MPa without sacrificing the toughness of PLA, and the vicat softening temperature of DPIM PLA/CNC increased from 60 °C to 155 °C. The microstructure of PLA/CNC composites was analyzed by SEM, SAXS and WAXD, and it was found that the coupling effect of CNC and strong shear flow field could significantly change the crystallization behavior of PLA. CNC could increase PLA shish length from 251 nm to 889 nm under the action of shear field. At the same time, due to this coupling effect, more PLA shish-kebab structures were induced at the interface. This special hierarchical structure composed of CNC and PLA Shish-Kebab is of great significance and can provide important guidance for achieving the balance of strength and toughness of polymer materials.
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Tensile strength and Young's modulus of PLA composites increased notably with the incorporation of well-dispersed CNCs or CNFs, even at low filler contents (<5 wt.%).
“As highlighted in the literature [14,15,16,17,18,19], tensile strength and Young’s modulus of PLA composites increased notably with the incorporation of well-dispersed CNCs or CNFs, even at low filler contents (<5 wt.%).”
CNCs accelerate the crystallization kinetics of PLA, thereby increasing its overall crystallinity.
“Similarly, it has been reported to accelerate the crystallization kinetics of PLA, thereby increasing its overall crystallinity [19,86,87].”
In PLA-based systems, nanocellulose enhances tensile strength, Young's modulus, and crystallinity.
“In PLA-based systems, NC has been shown to enhance tensile strength, Young’s modulus, and crystallinity [14,15,16,17,18,19]”
Melt processing techniques for PLA/NC are environmentally favorable and scalable.
“industrial relevance has driven growing interest in melt processing techniques, which are environmentally favorable and scalable [14,18,19,78]”
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Metadata
- Authors
- Wu, J.-J., Gao, N., Jiang, L., Zhong, G.-J., Deng, C., & Gao, X.
- Affiliations
- Sichuan University (CN)
- North Dakota State University (US)
- Corresponding author
- Gao, Xueqin
- Venue
- International Journal of Biological Macromolecules
- Publisher
- Elsevier BV
- Published
- 2022-05
- Volume
- 207
- Pages
- 927-940
- ISSN
- 0141-8130 (ISSN-L)
- OpenAlex
- W4220883994
- Cited by
- 22
- References
- 46
- Citations by year
- 2026: 2 · 2025: 5 · 2024: 3 · 2023: 11 · 2022: 1
- FWCI
- 1.60
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- International Journal of Biological Macromolecules (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 › Biomaterials › Advanced Cellulose Research Studies
- Keywords
- cellulose nanocrystals, polylactic acid, shear field, strength-toughness balance, hierarchy, shish-kebab structure, crystallization behavior, Vicat softening temperature, tensile strength, polymer nanocomposites, interfacial coupling
- MeSH terms
- Cellulose, Polyesters, X-Ray Diffraction, Nanoparticles, Scattering, Small Angle
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