Abstract
In this study, 2,6-diaminopurine was successfully grafted onto cellulose nanocrystal (CNC) backbones based on the FT-IR and solid-state 13C NMR analysis, thus producing a novel proton conductive membrane combined with excellent performance of CNCs and proton conductivity of purines. The highest degree of substitution of the modified materials reached 18.04% when the molar ratio of anhydroglucose units to 2,6-diaminopurine was 1: 2. These biodegradable membranes are highly expected to be a green alternative for conductive materials, showing high proton conduction up to 0.222 S cm−1 at high temperatures (100 °C), which was superior to that of the pure CNC membranes (0.019 S cm−1 at 100 °C). The composite films doped with oxidized CNCs showed an improved tensile strength of up to 91.35 MPa and the value of Young's modulus decreased about 10 times, indicating a higher mechanical strength and flexibility. Moreover, the composite membranes had good thermal stability and better methanol permeability (1.41 × 10−7 cm2 s−1) than that of a commercial membrane (2.09 × 10−6 cm2 s−1).
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This work is supported by the National Natural Science Foundation of China (Nos. 21878107, 21978101) and the Science and Technology Program of Guangzhou, China (201803020031).
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Zhao, G., Chen, Y., Huang, C. et al. Fabrication of a 2,6-diaminopurine-grafted cellulose nanocrystal composite with high proton conductivity. Cellulose 29, 2371–2385 (2022). https://doi.org/10.1007/s10570-021-04378-5
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DOI: https://doi.org/10.1007/s10570-021-04378-5