Journal
CELLULOSE
Volume 28, Issue 10, Pages 6373-6387Publisher
SPRINGER
DOI: 10.1007/s10570-021-03897-5
Keywords
Casting and drying method; Cellulose ethers; Cellulose nanofibril; Mechanical properties; Nano-reinforcing effect; TEMPO-CNF
Funding
- Japan Society for the Promotion of Science (JSPS) [17H03840]
- Grants-in-Aid for Scientific Research [17H03840] Funding Source: KAKEN
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In this study, composite films were prepared by mixing TEMPO-oxidized cellulose nanofibrils with different cellulose ethers, showing that the type of cellulose ether matrix used affects the tensile properties and distribution of the film. The TEMPO-CNF/HPC composite films exhibited a significant nano-reinforcing effect compared to those with other cellulose ethers.
A TEMPO-oxidized cellulose nanofibril (TEMPO-CNF)/water dispersion was mixed with an aqueous solution of hydroxypropyl cellulose (HPC), hydroxyethyl cellulose (HEC), methyl cellulose (MC), or carboxymethyl cellulose sodium salt (CMC). The mixtures were converted into TEMPO-CNF/cellulose ether composite films containing 0-5% TEMPO-CNFs by casting and drying of the aqueous mixtures. All the composite films had high light transparency. However, the tensile properties of the composite films of a given TEMPO-CNF content differed for the HPC and HEC, MC, and CMC matrices. The nano-reinforcing effect owing to TEMPO-CNFs was evident in the TEMPO-CNF/HPC composite films, which became strong but brittle. In contrast, the TEMPO-CNF/HEC composite films did not exhibit this nano-reinforcing effect. Transmission electron microscopy observation of the film cross-sections revealed that the TEMPO-CNF elements were homogeneously distributed in the 5% TEMPO-CNF/HPC composite film. In contrast, the TEMPO-CNF elements were densely present on the top and bottom surfaces of the 5% TEMPO-CNF/HEC composite film; the TEMPO-CNFs were heterogeneously distributed in the HEC matrix. The low gelation or aggregation concentrations of TEMPO-CNFs in water may have resulted in the different distribution states of TEMPO-CNFs, depending on the cellulose ether matrix used, and hence the different tensile behaviors. Graphic abstract
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