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Thermoplastic starch (TPS) from native corn starch was prepared using different mass ratios of formamide-urea compound plasticizers. The influence of the compound plasticizer on hydrogen bonds has been analyzed by IR spectroscopy. The characterization of TPS was studied using X-ray diffractometry and differential scanning calorimetry. The results showed that the optimal mass proportion of starch/formamide/urea was 10/2/1. Starch plasticization destroyed the crystal structure of the native 10 starch, increased the melting point of starch and improved the processability. Scanning electron micoroscope showed that there was significant change between starch molecules before and after plasticization. With the best plasticizing proportion of formamide-urea compound plasticizers, four kinds of thermoplastic starch composites reinforced with equal amount of sisal, pulp, straw and wood fibers were obtained by foam molding process. The IR spectroscopy investigations revealed the presence of 15 hydrogen bonds and explored the mechanism of physical interactions in composites. Thermogravimetric analysis demonstrated that sisal fiber composites had the best thermal stability. Besides, the mechanical properties of different fibers reinforced composites were investigated. The sisal fiber composites demonstrated the best tensile and compressive strength, respectively, 3.85MPa and 1.37MPa among the specimens. The fracture surfaces of these composites were also observed by SEM. 20 65 the largest impact on the compressive strength. The common starch plasticizer was formamide, urea, glycerol and glycol. [9][10][11][12] Recent studies demonstrated that compound plasticizers, such as formamide-urea compound plasticizer, formamide-urea-glycerol compound plasticizer and glycerol-glycol compound plasticizer, 70

This research aims to explore the buckling performance of a co‐cured and stiffened composite structure with embedded multilayer damping membranes (CSCSEMDM) under static load. A buckling model of this structure is established theoretically by using the principle of minimum potential energy and first‐order shear deformation theory. Then, the governing equation of the structure is obtained. The critical buckling load of the structure is solved, and the finite element method is used to verify the correctness of the theoretical model and theoretical methods. Finally, the effects of various parameters on the critical buckling load are discussed on the basis of the validated model.

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