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Yao Cai,Xizhong An,Qingchuan Zou,Dengzhi Yao,Haitao Fu,Hao Zhang,Xiaohong Yang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.9
The stacking sequences of fiber-reinforced composites for optimization of turbine blades with the bestperformance have become a focus of attention. However, the optimization and design principles of its flexural performanceare not yet mature. Referring to the problems in previous work, a 3D finite element flexural model of carbon fiber reinforcedcomposites was established based on the Abaqus/Explicit VUMAT subroutine through the Tsai-Wu failure criterion. Theinfluencing laws and optimization mechanisms of different stacking patterns (e.g., different orientations, number oforientation plies, combination of multiple orientation plies, and symmetry/asymmetry structures) on the flexural properties ofthe composites were systematically investigated, and corresponding design references for the optimization of stackingpatterns were given. The results show that the smaller the value of |θ-45 °| (θ represents the angle of the orientation ply), themore obvious the stress reduction of the orientation ply, and the orientation ply located in the outer layer is more conducive tothe improvement of flexural performance. As the number of orientation plies increases, the flexural strength anddisplacement increase, but the stability decreases, in which the laminate with 50 % 0 ° orientation plies has the best overallperformance. In addition, the stability ranking of the laminate stacking sequences for the same 0 ° orientation ply proportionis: multi-orientation asymmetric > multi-orientation symmetric > single-orientation symmetric. In particular, the [75/02/60/30/02/15] laminate has the best overall performance with the flexural strength of 974 MPa and the Y-axis offset of 0.057 mm,and its stability is 66 % higher than that of the [15/02/75]S laminate. Under the same tensile/compressive stresses, the actualstress of the warp/weft in the orientation ply is less than the maximum ideal stress and the stress of Y-axis direction SY ≠ 0,which delays the fracture of the orientation ply and causes displacement offset, and the increase of the number of orientationplies will aggravate this effect. The obtained highlighted results can provide valuable references for the design andoptimization of stacking patterns of plain fabric-reinforced laminates with high flexural properties.
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Haonan Chen,Mulin Guo,Xiaohong Yao,Zhengwei Luo,Kai Dong,Zhouyang Lian,Wuji Wei 한국섬유공학회 2018 Fibers and polymers Vol.19 No.4
A new chelating adsorbent for the removal of Cd(II) from aqueous solution, PP-g-GMA-DETA fibers, is prepared by plasma induced grafting of glycidyl methacrylate (GMA) onto the surface of polypropylene (PP) fibers, followed by modification with diethylenetriamine (DETA). The effects of grafting parameters on the grafting degree are investigated. Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy prove the successful grafting of GMA onto the surfaces of PP fibers and the subsequent conversion of epoxy groups of grafted GMA to amine groups, on reaction with DETA. The adsorption performances of Cd(II) by the chelating fibers are evaluated in detail. Kinetic and isothermal parameters are also evaluated. The data fit well with the pseudo-second order and Langmuir isotherm model, respectively. The maximum adsorption capacity of Cd(II) is 46.47 mg g-1 and the prepared fibers show selective adsorbability towards target Cd(II) in presence of competing Mg(II) ions.
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Lu Shuxin,Zhang Hongyu,Chai Maozhou,Yao Xiaohong,Zhang Xiangyu,Yang Yongqiang 한국탄소학회 2023 Carbon Letters Vol.33 No.2
Poor mechanical properties and bacterial infection are the main problems faced by dental restorative resins in clinical use. In this study, graphene quantum dots (GQDs) grafted with imidazole groups and mesoporous silica (MSN) are co-filled in a dental resin to impart excellent antimicrobial activity and mechanical properties to the dental resin. The higher specific surface area of GQDs and MSN results in an increased contact area with the resin matrix, which enhances the strength of the dental composite resin. The introduction of GQDs significantly improves the antimicrobial activity of the resin. The inhibition efficiency of the composite resin against Streptococcus mutans reached 99.9% with the addition of GQDs at only 0.2 wt.%. When MSN and GQDs are co-filled, MSN interferes with the release of GQDs, thus reducing the antimicrobial activity of the dental resin but improving the cyto-compatibility. By reasonably adjusting the amount of GQDs and MSN, the dental composite resin can exhibit excellent antimicrobial properties, mechanical properties and cyto-compatibility at the same time.
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