| As a kind of natural cellulose material,palm fiber has the advantages of biodegradability,low cost and environmental friendliness and has a long history of application.At present,palm fiber is mainly used in pulp,textile,building materials and other fields.In this study,palm fiber and palm sheet are used as test materials to develop palm fiber reinforced composite materials.The main research contents and conclusions are as follows:(1)In this study,raw palm fibers were subjected to three different chemical treatments to remove lignin,obtaining hemicellulose fiber.The resulting fibers were analyzed for surface and cross-sectional morphology,thermal properties,primary tensile fracture,infrared spectrum characterization,and chemical component quantification.Comparisons were made between the original palm fiber and the treated fibers.After the removal of lignin,the surface of the fiber becomes smoother and the number of irregularities decreases.In terms of thermal properties,the original palm fiber exhibits the highest heat resistance and initial decomposition temperature.The mechanical properties of fibers treated with glacial acetic acid+sodium chlorite and sodium hydroxide+sodium sulfite were improved,resulting in a tensile strength of 212.24±66.20MPa and 227.34±52.27MPa,respectively.This represents a significant increase of approximately23.97%and 32.73%compared to the original palm fibers,respectively.The analysis of the fiber’s chemical components revealed a reduction in pectin,lipid wax,lignin,and other components after treatment,while cellulose content increased.(2)In this study,palm sheet was utilized as the experimental raw material and underwent chemical treatment to serve as the reinforcement phase for two types of thermoplastic resins in the preparation of composite materials.The impact of temperature on the forming process of these materials was examined,and subsequent tensile,bending,and impact tests were conducted to evaluate their properties.The study found that using original palm fiber as the reinforcement phase,combined with Surlyn resin and polycarbonate resin as the matrix,The optimal hot pressing temperature was 100°C and 140°C,under which the appearance of the composite was good and the tensile strength was the highest,which was 36.98±8.05MPa,70.75±7.14MPa,respectively.When the degummed brown flakes are used as the reinforced phase,due to the decrease in the thermal properties of palm fibers,the composite material may undergo carbonization failure,tensile and bending strength weakened,but the impact strength of the composite material increases under the same hot pressing temperature.(3)In order to resist tool impact load,the carbon fiber composite material was prepared using carbon fiber as the reinforcement fiber and polycarbonate resin as the matrix.The material takes advantage of the high strength,high modulus,and low density characteristics of carbon fiber.This study explores the use of brown composite material as a ductile material to absorb energy and bear load.Hybrid composites were created by stacking carbon plates and brown composite materials,and their puncture resistance was measured through both quasi-static and dynamic puncture tests.The results indicate that when the thickness is similar,when the upper and lower layers of the composite are prepared with two and four layers of carbon fiber plain cloth respectively,and the middle layer is a palm fiber composite,it has a higher quasi-static initial modulus and unit areal density puncture work,which is compared with pure carbon fiber composites demonstrates a higher punctured energy per unit thickness and average energy consumption.At a thickness of approximately 4.80mm and a density of around 1.35g/cm~3,sample can withstand a maximum of24J of energy without being penetrated. |
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