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Water retention value for characterizing fibrillation degree of cellulosic fibers at micro and nanometer scales

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Abstract

This study examined in detail the utility and validity of water retention value (WRV) for characterizing the extent of fibrillation of micro and nanofibrils. A bleached pulp fiber sample was either refined to different degrees using a PFI mill or milled for different time periods using a SuperMassColloider (SMC), to produce micro and nanofibril samples. These fibril samples were then characterized by electronic microscopic imaging (SEM and TEM), degree of polymerization (DP), Canadian Standard Freeness (CSF), enzymatic adsorption (EA), enzymatic cellulose digestibility (ED), as well as WRV measured under different relative centrifugation forces and durations. The results showed that WRV characterization is consistent with SEM and TEM imaging and correlate to sample DP, EA, and ED. CSF is a good measure for fiber samples, but is not sensitive and not suitable for characterizing microfibrils and nanofibrils. DP is a good measure of cellulose chain length or fiber cutting, but is not a sensitive measure for extensive fibrillation. The results also indicate that the centrifugation condition did not affect the effectiveness of WRV for characterizing fibril samples, as long as all samples were tested under the same conditions. A mild centrifugation condition, e.g., 3000g for 15 min, appears to have better sensitivity for characterizing fibril samples.

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Acknowledgments

We acknowledge the financial support by a USDA Agriculture and Food Research Initiative (AFRI) Competitive Grant (No. 2011-67009-20056), Natural science fund for colleges and universities in Jiangsu Province (No. 16KJB180029), Jiangsu Provincial Key Lab of Bioenergy and Biomaterial Fund (No. JSBEM201607). We also acknowledge Nancy Ross Sutherland and Thomas Kuster of FPL for PFI refining and SEM imaging, respectively, and Debra Sherman of DS imaging LLC, West Lafayette, IN, for TEM imaging.

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Correspondence to J. Y. Zhu.

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Gu, F., Wang, W., Cai, Z. et al. Water retention value for characterizing fibrillation degree of cellulosic fibers at micro and nanometer scales. Cellulose 25, 2861–2871 (2018). https://doi.org/10.1007/s10570-018-1765-8

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