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Research on thermoplastic starch and different fiber reinforced biomass composites

机译：热塑性淀粉与不同纤维增强生物质复合材料的研究

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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 starch, increased the melting point of starch and improved the processability. Scanning electron microscopy showed that there was a 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 amounts of sisal, pulp, straw and wood fibers were obtained by a foam molding process. The IR spectroscopy investigations revealed the presence of 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 fiber reinforced composites were investigated. The sisal fiber composites demonstrated the best tensile and compressive strength, 3.85 MPa and 1.37 MPa, respectively, among the specimens. The fracture surfaces of these composites were also observed by SEM.
机译：使用不同质量比的甲酰胺-脲复合增塑剂，可以从天然玉米淀粉制备热塑性淀粉（TPS）。通过红外光谱分析了复合增塑剂对氢键的影响。使用X射线衍射和差示扫描量热法研究了TPS的表征。结果表明，淀粉/甲酰胺/尿素的最佳质量比为10/2/1。淀粉增塑破坏了天然淀粉的晶体结构，提高了淀粉的熔点并改善了可加工性。扫描电子显微镜显示，增塑前后淀粉分子之间存在显着变化。以最佳的甲酰胺-脲复合增塑剂增塑比例，通过泡沫成型工艺获得了四种等量的剑麻，纸浆，稻草和木纤维增强的热塑性淀粉复合材料。红外光谱研究揭示了氢键的存在，并探讨了复合材料中物理相互作用的机理。热重分析表明剑麻纤维复合材料具有最佳的热稳定性。此外，研究了不同纤维增强复合材料的力学性能。剑麻纤维复合材料在样品中表现出最佳的拉伸和压缩强度，分别为3.85 MPa和1.37 MPa。这些复合材料的断裂表面也通过SEM观察。

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