Sheng Duan, Wenhua Gao, Xingmei Tang, Hefang Liu, Jinpeng Li, Daxian Cao, Jinsong Zeng, Bin Wang, Jun Xu, Kefu Chen
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引用次数: 0
Abstract
Cellulose nanofibril (CNF) suspension usually has a relatively low concentration, and in order to reduce its transportation and storage cost concentration process is introduced. However, in the concentration and following the redispersion process, irreversible binding between fibrils was formed, causing changes in the structural characteristics of fibrils, and accurately evaluating the properties of CNFs was highly necessary. In this study, the prepared 1.0 wt% CNF suspension was dewatered by centrifugation, obtaining concentrated CNFs labeled 1-CNF. Then, the 1-CNF sample was diluted and redispersed by a high-speed homogenizer and dewatered again, preparing re-concentrated CNFs labeled 2-CNF. The concentrated and redispersed CNFs produced pore structures among fibrils, which could be used to reflect their characteristics. The pore size distribution of CNFs was analyzed by a solute exclusion technique based on a range of molecular weight PEG and dextran molecules. The total volume of inaccessible pores in the CNFs increased with the concentration degree. The most accessible pore sizes of 1-CNF and 2-CNF were 35 Å and 53 Å, respectively. The presence of pore structure in CNFs also affected the properties of CNF films. The mechanical properties, oxygen and water vapor barrier properties, and transmittance performance of 1-CNF films were higher than that of 2-CNF films, while the 2-CNF showed higher water absorption properties.
期刊介绍：
Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.
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