As a biological by-product, cornstalk will pose a huge threat to the development of sustainable agriculture and environmental protection if it is not fully utilized. In this study, the macrostructure was characterized by optical camera and the chemical composition of cornstalk rind and cornstalk pith was characterized by Fourier transform infrared spectroscopy (FTIR). The test results show that the cornstalk was divided into rind and pith macroscopically, the cornstalk is smooth outside, and the pith is a sponge-like structure, the fiber structure evenly distributed on the pith. FTIR analysis showed that the cornstalk was presumed to be aliphatic compounds containing C-H chains and rich in fatty acids and/or ketones, and the main components include cellulose and lignin. The results of this study provide new inspiration and reference for the post-processing of cornstalks.
The research on the mechanical properties of cornstalk, a natural biomass, is of great significance in the fields of deep-processing and reuse, preparation of biomimetic materials and so on. In this study, an electronic universal material testing machine was used in the macroscopic mechanical property test of cornstalk radial compression, axial compression, cutting, and three-point bending. The microstructure of cornstalk rind and cornstalk pith was characterized by scanning electron microscopy (SEM), and the effect of microstructure on mechanical properties of cornstalk was revealed. Mechanical properties of cornstalk mainly depend on the pith in radial compression, and mainly depend on the rind in other loading modes, and the relationship between the mechanical properties and the microstructure of corn stalk is revealed from the microscopic scale.
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