期刊
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
卷 118, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmbbm.2021.104399
关键词
Cellulos e nanocrystal; Interfacial properties; Misalignment; Fiber length distribution; Fiber orientation distribution; Coarse-grained modeling
资金
- National Science Foundation [CMMI1449358]
The mechanical properties of cellulose nanocrystal films are critically dependent on factors such as fiber length distribution, orientation distribution, and interactions between fibers. Adhesion strength is found to be the key parameter that significantly improves mechanical properties.
The mechanical properties of cellulose nanocrystal (CNC) films critically depend on many microstructural parameters such as fiber length distribution (FLD), fiber orientation distribution (FOD), and the strength of the interactions between the fibers. In this paper, we use our coarse-grained molecular model of CNC to study the effect of length and orientation distribution and attractions between CNCs on the mechanical properties of neat CNCs. The effect of misalignment of a 2D staggered structure of CNC with respect to the loading direction was studied with simulations and analytical solutions and then verified with experiments. To understand the effect of FLD and FOD on the mechanical performance, various 3D microstructures representing different case studies such as highly aligned, randomly distributed, short length CNCs and long length CNCs were generated and simulated. According to the misalignment study, three different failure modes: sliding mode, mixed mode, and normal mode were defined. Also, comparing the effects of FOD, FLD, and CNC interaction strength, shows that the adhesion strength is the only parameter that can significantly improve the mechanical properties, regardless of loading direction or FOD of CNCs.
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