Effect of Polydopamine Coating of Cellulose Nanocrystals on Performance of PCL/PLA Bio-Nanocomposites
Open accessAbstract
In bio-nanocomposites with a poly(lactic acid) (PLA)/poly(ε-caprolactone) (PCL) matrix with neat and polydopamine (PDA)-coated cellulose nanocrystals (CNCd), the use of different mixing protocols with masterbatches prepared by solution casting led to marked variation of localization, as well as reinforcing and structure-directing effects, of cellulose nanocrystals (CNC). The most balanced mechanical properties were found with an 80/20 PLA/PCL ratio, and complex PCL/CNC structures were formed. In the nanocomposites with a bicontinuous structure (60/40 and 40/60 PLA/PCL ratios), pre-blending the CNC and CNCd/PLA caused a marked increase in the continuity of mechanically stronger PLA and an improvement in related parameters of the system. On the other hand, improved continuity of the PCL phase when using a PCL masterbatch may lead to the reduction in or elimination of reinforcing effects. The PDA coating of CNC significantly changed its behavior. In particular, a higher affinity to PCL and ordering of PLA led to dissimilar structures and interface transformations, while also having antagonistic effects on mechanical properties. The negligible differences in bulk crystallinity indicate that alteration of mechanical properties may have originated from differences in crystallinity at the interface, also influenced by presence of CNC in this area. The complex effect of CNC on bio-nanocomposites, including the potential of PDA coating to increase thermal stability, is worthy of further study.
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Biodegradation is slowed by poor dispersion of CNCs on the PLA matrix or strong CNCs-PLA interfacial adhesion, which lowers water penetration and polymer chain mobility.
“Biodegradation is slowed by poor dispersion of CNCs on the PLA matrix or strong CNCs–PLA interfacial adhesion, which lowers water penetration and polymer chain mobility [84].”
From Nanocellulose-Reinforced Poly(Lactic Acid) and Poly(ε-caprolactone) Bio-Nanocomposites: A Review and Future Outlook for Poly(Lactic Acid)/Poly(ε-caprolactone) Blend Systems (2025) · cites this paper as [84]
Section 3.1 discusses CNC dispersion and affinity, and Section 3.4 reports hindered chain mobility during cooling. Neither connects those properties to slower biodegradation or reduced water penetration. Searches for biodegradation, water penetration, and degradation found no passage addressing that proposed mechanism; page numbers were not available in our copy. (LLM, conf=0.74)
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- Authors
- Kelnar, I., Kaprálková, L., Krejčíková, S., Dybal, J., Vyroubalová, M., & Abdel-Mohsen, A. M.
- Affiliations
- Czech Academy of Sciences (CZ)
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, 16200 Praha, Czech Republic
- Corresponding author
- Kelnar, Ivan
- Venue
- Materials
- Publisher
- MDPI AG
- Published
- 2023-01-27
- Volume
- 16
- Issue
- 3
- Pages
- 1087
- ISSN
- 1996-1944 (ISSN-L)
- PMC
- PMC9920865
- OpenAlex
- W4318204032
- Cited by
- 7
- References
- 48
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 3 · 2023: 1
- FWCI
- 0.45
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Materials (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Academy of Sciences of the Czech Republic (ASRT 19-06)
- Topics
- Physical Sciences › Materials Science › Biomaterials › Advanced Cellulose Research Studies
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Materials Science › Polymers and Plastics › Natural Fiber Reinforced Composites
- Keywords
- polydopamine coating, cellulose nanocrystals, polylactic acid, polycaprolactone, bionanocomposites, masterbatch, bicontinuous structure, mechanical reinforcement, thermal stability, polymer blending, structure-directing effect
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