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Nair, Sandeep S.; Sharma, Sudhir; Pu, Yunqiao; Sun, Qining; Pan, Shaobo; Zhu, J. Y; Deng, Yulin; Ragauskas, Art J.
ChemSusChem, December 2014, Letnik: 7, Številka: 12Journal Article
A new method to prepare nanolignin using a simple high shear homogenizer is presented. The kraft lignin particles with a broad distribution ranging from large micron‐ to nano‐sized particles were completely homogenized to nanolignin particles with sizes less than 100 nm after 4 h of mechanical shearing. The 13C nuclear magnetic resonance (NMR) and 31P NMR analysis showed that there were no major changes in the chemical composition between the starting kraft lignin particles and the nanolignin obtained after 4 h of mechanical treatment. The nanolignin particles did not show any change in molecular weight distribution and polydispersity compared to the original lignin particles. The nanolignin particles when used with polyvinyl alcohol (PVA) increased the thermal stability of nanolignin/PVA blends more effectively compared to the original lignin/PVA blends. Lignin to nanolignin: Nanolignin particles are obtained by homogenizing kraft lignin particles using a high shear homogenizer. The nanolignin particles show no change in chemical structure, molecular weight distribution, and polydispersity compared to the kraft lignin particles. The nanolignin particles are well dispersed within the polyvinyl alcohol (PVA) matrix (see image) with minimal agglomeration to enhance the composite performance.
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