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Characterization of KH-560-Modified Jute Fabric/Epoxy Laminated Composites: Surface Structure and Thermal and Mechanical Properties

机译:KH-560改性黄麻织物/环氧层压复合材料的表征:表面结构以及热力学性能

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摘要

In this study, jute fabrics were used to reinforce epoxy resin to prepare laminated composites. KH-560 silane coupling agent modification was used to improve the interfacial compatibility between fibers and epoxy. The effects of different immersion times (0 min, 10 min, 30 min, 60 min, 90 min, and 120 min) on the jute fiber’s element content, crystal structure, and thermal stability, and the mechanical properties of laminated composites were studied. X-ray diffractometry (XRD) analysis showed that the KH-560 modification improved the crystallinity index (CI) and crystallite sizes (CS) of jute fibers. Scanning electron microscopy (SEM) analysis of the tensile fracture surfaces revealed a thick epoxy on the modified pulled fiber surfaces. Fourier transform infrared spectroscopy (FTIR) and energy dispersive spectrometer (EDS) analysis identified the presence of silicon and C–O–Si/Si–O–Si cross-linked structures on the surface of modified jute fibers. These cross-linked structures improved the thermal stability and mechanical properties of the laminated composites. When the immersion time was 60 min, the CI, CS, tensile strength, tensile modulus, flexural strength, and flexural modulus of the modified samples were 42.39%, 3.62 nm, 34.6 ± 1.1 MPa, 2.11 ± 0.12 GPa, 83.7 ± 1.8 MPa, and 4.08 ± 0.12 GPa, respectively, which were better than that of unmodified and other modified composites.
机译:在这项研究中,黄麻织物用于增强环氧树脂以制备层压复合材料。使用KH-560硅烷偶联剂进行改性,以改善纤维与环氧树脂之间的界面相容性。研究了不同浸入时间(0分钟,10分钟,30分钟,60分钟,90分钟和120分钟)对黄麻纤维中元素含量,晶体结构和热稳定性的影响,以及层压复合材料的机械性能。 X射线衍射(XRD)分析表明,KH-560改性剂改善了黄麻纤维的结晶度指数(CI)和微晶尺寸(CS)。拉伸断裂表面的扫描电子显微镜(SEM)分析显示,改性的拉制纤维表面上有浓厚的环氧树脂。傅立叶变换红外光谱(FTIR)和能量色散光谱仪(EDS)分析确定了改性黄麻纤维表面上存在硅和C–O–Si / Si–O–Si交联结构。这些交联结构改善了层压复合材料的热稳定性和机械性能。浸泡时间为60分钟时,改性样品的CI,CS,拉伸强度,拉伸模量,挠曲强度和挠曲模量分别为42.39%,3.62 nm,34.6±1.1 MPa,2.11±0.12 GPa,83.7±1.8 MPa和分别为4.08±0.12 GPa和优于未改性和其他改性的复合材料。

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