Nanocellulose films with combined cellulose nanofibers and nanocrystals: tailored thermal, optical and mechanical properties
Nanocellulose films with combined cellulose nanofibers and nanocrystals: tailored thermal, optical and mechanical properties
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DOI：
10.1007/s10570-017-1627-9
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发表时间：
2018-02
期刊：
影响因子：
5.7
通讯作者：
Xiuxuan Sun;Qinglin Wu;Xiuqiang Zhang;Suxia Ren;Tingzhou Lei;Wencai Li;Guangyin Xu;Quanguo Zhang
中科院分区：
文献类型：
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作者：
Xiuxuan Sun;Qinglin Wu;Xiuqiang Zhang;Suxia Ren;Tingzhou Lei;Wencai Li;Guangyin Xu;Quanguo Zhang
制备了纤维素纳米纤维（CNFs）和纳米晶体（CNCs），并用于制备CNF/CNC薄膜。CNF/CNC悬浮液的流变行为和膜的其它相关性质的特征在于与类似厚度的商业多孔聚合物电池隔膜（PBS）膜相比。在成膜悬浮液中使用混合CNF和CNC导致膜形态和结构性质的显著变化。在混杂纳米纤维素材料中添加CNCs后，CNF/CNC悬浮液的粘度和zeta电位、薄膜拉伸强度、结晶度指数和光学透明度都有所增加。随着悬浮液中CNF负载量的增加，膜的孔隙率、热稳定性和热膨胀增强。CNF/CNC薄膜的热稳定性、热膨胀行为和光学性能均优于PBS薄膜。CNF/CNC和PBS膜的热膨胀系数分别为11.86-17.65和178.90 ppm/k。CNF/CNC复合膜在各个方向上的强度沿着更均匀，而PBS复合膜表现出各向异性。这项工作为定制纳米纤维素薄膜的性能铺平了新的策略。
Cellulose nanofibers (CNFs) and nanocrystals (CNCs) were prepared, and used to prepare thin CNF/CNC films. Rheological behavior of CNF/CNC suspensions and the other relevant properties of the films were characterized in comparison with a commercial porous polymer battery separator (PBS) film of similar thickness. The use of mixed CNFs and CNCs in the film-forming suspension led to significant variation of film morphology, and structural properties. With the addition of CNCs in hybrid nanocellulose material, the CNF/CNC suspension viscosity and zeta potential, film tensile strength, crystallinity index, and optical transparency were increased. With the increased CNF loading in the suspension, film porosity, thermal stability, and thermal expansion were enhanced. The CNF/CNC films exhibited better thermal stability, thermal expansion behavior, and optical properties than those of the commercial PBS film. The coefficient thermal expansion of the CNF/CNC and PBS films were 11.86–17.65 and 178.90 ppm/k, respectively. The CNF/CNC films had more uniform strength along all directions, whereas PBS film demonstrated anisotropic property. This work paves a new strategy to tailor the properties of nanocellulose based films.