The use of solvent-soaking treatment to enhance the anisotropic mechanical properties of electrospun nanofiber membranes for water filtration

RSC Advances ◽  
2016 ◽  
Vol 6 (71) ◽  
pp. 66807-66813 ◽  
Author(s):  
Jie Cai ◽  
Qian Zhang ◽  
Miao Lei ◽  
Jingren He ◽  
Gang Liu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Molecular Orientation ◽  
Fibrous Structure ◽  
Water Filtration ◽  
Electrospun Nanofiber ◽  
Anisotropic Mechanical Properties ◽  
Nanofiber Membranes

The solvent-soaking treatment for improving the tensile strength of B-CA mats is proposed. A fibrous structure with changed morphology and molecular orientation resulted. These results showed important influences on the mechanical properties.

Anisotropic Mechanical Properties of Rapid Prototyping Parts Fabricated by Stereolithography

2021 ◽  
Vol 13 (9) ◽  
pp. 1812-1819
Author(s):  
Na-Na Yang ◽  
Hao-Rui Liu ◽  
Ning Mi ◽  
Qi Zhou ◽  
Li-Qun He ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Brittle Fracture ◽  
Fracture Surface ◽  
Elongation At Break ◽  
Build Orientation ◽  
Range Distribution ◽  
Anisotropic Mechanical Properties ◽  
Orientation Experiment

Stereolithography (SLA)-manufactured parts behave with anisotropic properties due to the varying interface orientations generated by the layer-based manufacturing process. Part build orientation is a very important factor of anisotropic mechanical properties. In this paper, the build orientation experiment was designed to study the anisotropic behaviour of the mechanical properties of the SLA parts based on the orientation relationship between the force and the layer. The results show that there are obvious brittle characteristics on the fracture surface of the specimens and microcracks perpendicular to the direction of the layer distributed on the side of the fracture. The mechanical properties under brittle fracture have different degrees of sensitivity to the build orientation. Among all the build orientations, whether a specimen is built flat or on an edge shows obvious difference in tensile strength, and the relative range distribution reaches 35%. The changes in elastic modulus and the elongation at break are the most obvious in different angles relative to the XY plane, and the relative range distribution reaches 62% and 56% respectively. In all the build orientations designed, the tensile strength is the largest when it is placed on the edge at 0° with Y-axis in the XY plane, the elastic modulus is the largest when it was placed vertically, and the elongation at break is the largest when it is placed flat at 45° with Y-axis in the XY plane.

Influence of annealing on microstructure & molecular orientation, thermal behaviour, mechanical properties and their correlations of uniaxially drawn iPP thin film

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Sayant Saengsuwan
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Thermal Behaviour ◽  
Annealing Time ◽  
Molecular Orientation ◽  
Young's Modulus ◽  
Crystal Thickness ◽  
Scanning Calorimetry

AbstractThe influence of annealing on the microstructure and molecular orientation, thermal behaviour and mechanical properties of uniaxially drawn iPP thin film was studied by wide-angle X-ray diffraction, differential scanning calorimetry and tensile testing, respectively. The correlations of mechanical and microstructural properties of annealed films were also examined. The transformation of smectic phase of iPP to the α-form was more pronounced with increasing annealing time and temperature. The true and apparent crystallinities and crystal thickness were strongly enhanced with annealing time and temperature. The relative molecular orientation tended to increase with annealing time. These results caused the significant improvement of modulus and tensile strength of the annealed films in both machine (MD) and transverse (TD) directions. The increases in MD-Young’s modulus and MD-tensile strength were well correlated with the increase in true crystallinity obtained in equatorial scans. Some relationship between the increase in crystal thickness and the increase in Young’s modulus in both MD and TD directions was also found.

scholarly journals Engineering and Characterization of Antibacterial Coaxial Nanofiber Membranes for Oil/Water Separation

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2597 ◽  
Author(s):  
Hamouda M. Mousa ◽  
Husain Alfadhel ◽  
Emad Abouel Nasr
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Zno Nps ◽  
Electrospinning Technique ◽  
Water Contact ◽  
Water Separation ◽  
Nanofiber Membranes

In the present study, a coaxial nanofiber membrane was developed using the electrospinning technique. The developed membranes were fabricated from hydrophilic cellulose acetate (CA) polymer and hydrophobic polysulfone (PSf) polymer as a core and shell in an alternative way with addition of 0.1 wt.% of ZnO nanoparticles (NPs). The membranes were treated with a 2M NaOH solution to enhance hydrophilicity and thus increase water separation flux. Chemical and physical characterizations were performed, such as Fourier transform infrared (FTIR) spectroscopy, and surface wettability was measured by means of water contact angle (WCA), mechanical properties, surface morphology via field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and microscopy energy dispersive (EDS) mapping and point analysis. The results show higher mechanical properties for the coaxial nanofiber membranes which reached a tensile strength of 7.58 MPa, a Young’s modulus of 0.2 MPa, and 23.4 M J.m−3 of toughness. However, treated mebranes show lower mechanical properties (tensile strength of 0.25 MPa, Young’s modulus of 0.01 MPa, and 0.4 M J.m−3 of toughness). In addition, the core and shell nanofiber membranes showed a uniform distribution of coaxial nanofibers. Membranes with ZnO NPs showed a porous structure and elimination of nanofibers after treatment due to the formation of nanosheets. Interestingly, membranes changed from hydrophobic to hydrophilic (the WCA changed from 90 ± 8° to 14 ± 2°). Besides that, composite nanofiber membranes with ZnO NPs showed antibacterial activity against Escherichia coli. Furthermore, the water flux for the modified membranes was improved by 1.6 times compared to the untreated membranes.

Controllable synthesis of peapod-like TiO2@GO@C electrospun nanofiber membranes with enhanced mechanical properties and photocatalytic degradation abilities towards methylene blue

2020 ◽  
Vol 44 (9) ◽  
pp. 3755-3763 ◽  
Author(s):  
Qi Zhang ◽  
Xing Chen ◽  
Haiyan Wang ◽  
Xuming Bai ◽  
Xiaonan Deng ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Carrier Transport ◽  
Photocatalytic Properties ◽  
Electrospun Nanofiber ◽  
Controllable Synthesis ◽  
Nanofiber Membranes

Electrospun peapod-like TiO2@GO@C nanofiber membranes enhance their photocatalytic properties for the improved crystallinity of TiO2 and carrier transport, and simultaneously improve their mechanical properties.

Improved mechanical properties and hydrophilicity of electrospun nanofiber membranes for filtration applications by dopamine modification

2014 ◽  
Vol 460 ◽  
pp. 241-249 ◽  
Author(s):  
Liwei Huang ◽  
Jason T. Arena ◽  
Seetha S. Manickam ◽  
Xiaoqiang Jiang ◽  
Brian G. Willis ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electrospun Nanofiber ◽  
Nanofiber Membranes

Effect of process parameters on tensile strength of FDM printed PLA part

2018 ◽  
Vol 24 (8) ◽  
pp. 1317-1324 ◽  
Author(s):  
Shilpesh R. Rajpurohit ◽  
Harshit K. Dave
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Process Parameters ◽  
Fused Deposition Modelling ◽  
Type I ◽  
Content Type ◽  
Layer Height ◽  
Fused Deposition ◽  
Anisotropic Mechanical Properties ◽  
Raster Angle

PurposeThe purpose of this paper to study the tensile strength of the fused deposition modelling (FDM) printed PLA part. In recent times, FDM has been evolving from rapid prototyping to rapid manufacturing where parts fabricated by FDM process can be directly used for application. However, application of FDM fabricated part is significantly affected by poor and anisotropic mechanical properties. Mechanical properties of FDM part can be improved by proper selection of process parameters.Design/methodology/approachIn the present study, three process parameter, namely, raster angle, layer height and raster width, have been selected to study their effect on tensile properties. Parts are fabricated as per ASTM D638 Type I standard.FindingsIt has been observed that the highest tensile strength obtained at 0° raster angle. Lower value of layer height is observed to be good for higher tensile strength because of higher bonding area between the layers. At higher value of raster width, tensile strength is improved up to certain extent after which presence of void reduces the tensile strength.Originality/valueIn the present investigation, layer height and raster width have been also varied along with raster angle to study their effect on the tensile strength of FDM printed PLA part.

Evaluation of Mechanical Properties of Wollastonite/SBR Composite

2011 ◽  
Vol 217-218 ◽  
pp. 286-289 ◽  
Author(s):  
Xiang Hai Meng ◽  
Yi He Zhang ◽  
Fan Wang ◽  
Zhi Lei Zhang ◽  
Rui Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fibrous Structure ◽  
Mechanical Agitation ◽  
Elongation At Break ◽  
Butadiene Styrene

The wollastonite with fibrous structure can be used as the filler in the composite. In this paper, the composite was prepared by incorporating the wollastonite into butadiene styrene rubber (SBR) matrix through the mechanical agitation and roll mixing technologies. Mechanical properties of SBR filled with different amount of wollastonite content were studied and compared. It was shown that the mechanical properties of SBR filled with wollastonite could be improved significantly. The tensile strength and elongation at break were increased with the increase of the wollastonite. The tensile strength could be enhanced from 4.1MPa to 5.0MPa, and the elongation at break from 389% to 572%.

Improvement the Elongation at Break of Reclaimed Rubber

2011 ◽  
Vol 217-218 ◽  
pp. 290-293
Author(s):  
Xiang Hai Meng ◽  
Yi He Zhang ◽  
Fan Wang ◽  
Zhi Lei Zhang ◽  
Rui Zhang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Tensile Strength ◽  
Fibrous Structure ◽  
Mechanical Agitation ◽  
Elongation At Break

The reclaimed rubber was used for many fields, but the mechanical properties especially elongation at break of reclaimed rubber couldn’t meet the requirement due to its recycle property. It was proved that the wollastonite with fibrous structure could improve the mechanical properties in many composite. In this study, the reclaimed rubber modified by wollastonite was prepared by the mechanical agitation and open roll mixing methods. The composite was characterized and tested after the renewed vulcanization, and the mechanical properties could be improved. It was observed from experimental data that the elongation at break could enhance from 238% to 300%. Moreover, the tensile strength could increase to some extent.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

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