Bacterial cellulose nanocrystals exhibiting high thermal stability and their polymer nanocomposites
Abstract
Nanocrystals prepared from bacterial cellulose are considered as 'green nanomaterials' depending on their renewable nature and ease of production without the involvement of hazardous chemical treatments. In this investigation, a top down approach was followed for the preparation of bacterial cellulose nanocrystals (BCNC) using a commercially available cellulase enzyme so as to retain native properties of bacterial cellulose even in its nanodimensional form. The morphological and dimensional parameters of BCNC were studied using atomic force microscope (AFM) and transmission electron microscope (TEM). Thermal properties of BCNC produced using the novel enzyme treatment and conventional sulfuric acid hydrolysis were compared. The thermal stability of enzyme processed BCNC was almost two fold higher than sulfuric acid processed ones. Further, the activation energy required for decomposition of enzyme processed BCNC was much higher than the other. Using this enzyme processed BCNC, Polyvinylalcohol (PVA) nanocomposite films were prepared and characterized. Incorporation of these nanocrystals in polymer matrix resulted in a remarkable improvement in the thermal stability as well as mechanical properties of nanocomposite films. These nanocomposites exhibited higher melting temperature (Tm) and enthalpy of melting (ΔHm) than those of pure PVA, suggesting that the addition of nanocrystals modified the thermal properties of PVA. The effective load transfer from polymer chains to the BCNC resulted in an improved tensile strength from 62.5 MPa to 128 MPa, by the addition of just 4 wt% of BCNC. Furthermore, the elastic modulus was found to increase from 2 GPa to 3.4 GPa. The BCNC obtained through cellulose treatment under controlled conditions were associated with several desirable properties and appear to be superior over the conventional methods of nanocrystals production. The enzymatic method followed in this study is expected to contribute the fabrication of high performance polymer nanocomposites in a much greener and innovative manner.
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High aspect ratio should favor tension transfer in the nanofiber-matrix interface.
“George et al. (2011) stated that high aspect ratio should favor tension transfer in the nanofiberematrix interface.”
From Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment (2014) · cites this paper as George et al. (2011)
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Cellulose nanofibers produced from banana peel by chemical and enzymatic treatment
Tibolla, H., Pelissari, F. M., & Menegalli, F. C. (2014) · LWT - Food Science and Technology · doi:10.1016/j.lwt.2014.04.011 · Cited by 358 · see citing works
- Authors
- George, J., Ramana, K. V., Bawa, A. S., & Siddaramaiah
- Affiliations
- Defence Food Research Laboratory (IN)
- Corresponding author
- George, Johnsy
- Venue
- International Journal of Biological Macromolecules
- Publisher
- Elsevier BV
- Published
- 2011-01
- Volume
- 48
- Issue
- 1
- Pages
- 50-57
- ISSN
- 0141-8130 (ISSN-L)
- OpenAlex
- W2043323014
- Cited by
- 319
- References
- 35
- Citations by year
- 2026: 12 · 2025: 19 · 2024: 23 · 2023: 18 · 2022: 23 · 2021: 25 · 2020: 26 · 2019: 28 · 2018: 21 · 2017: 27 · 2016: 25 · 2015: 23 · 2014: 10 · 2013: 18 · 2012: 13
- FWCI
- 5.15
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- International Journal of Biological Macromolecules (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Jawaharlal Nehru Centre for Advanced Scientific Research
- Topics
- Physical Sciences › Materials Science › Biomaterials › Advanced Cellulose Research Studies
- Physical Sciences › Materials Science › Biomaterials › Nanocomposite Films for Food Packaging
- Physical Sciences › Engineering › Building and Construction › Dyeing and Modifying Textile Fibers
- Keywords
- bacterial cellulose nanocrystals, cellulase treatment, sulfuric acid hydrolysis, thermal stability, decomposition activation energy, polyvinyl alcohol nanocomposites, polymer nanocomposite films, tensile strength, elastic modulus, melting point, green nanomaterials
- MeSH terms
- Acetobacter, Calorimetry, Differential Scanning, Cellulase, Cellulose, Polyvinyl Alcohol, Temperature, Thermogravimetry, Spectroscopy, Fourier Transform Infrared, Nanoparticles, Nanocomposites, Mechanical Phenomena
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