Indirect measurement of tensile strength of hollow fiber braid membranes

Desalination ◽  
2008 ◽  
Vol 234 (1-3) ◽  
pp. 107-115 ◽  
Author(s):  
Myoung Jun Park ◽  
Hern Kim
2020 ◽  
Vol 1010 ◽  
pp. 239-243
Author(s):  
Mohsen Ahmadipour ◽  
Tunmise Ayode Otitoju ◽  
Mohammad Arjmand ◽  
Zainal Arifin Ahmad ◽  
Swee Yong Pung

Dry/wet method was used to prepare CaCuTi4O12 (CCTO) hollow fibers (HFs) and then the structural and physico-mechanical properties of HFs were characterized by XRD, FESEM, BET and tensile strength, respectively. The outer diameter and thickness of CCTO HFs were found to be 650 μm and 390 μm, respectively. A finger-like macrovoids and sponge-like was observed inside the membrane with a denser structure in the outer layer. It was observed that the crystallite size was increased from 28.5 nm to 37.0 nm while the average pore diameter was decreased from 34.65 nm to 29.16 nm in CCTO hollow fiber with 1.0 wt.% CCTO. In addition, the tensile strength of HFS was significantly improved from 4.84 MPa to 5.54 MPa and elongation at break was decreased from 6.97 % to 5.09 % which is ascribed to the reduction in porosity. All the results indicated the significant effect of CCTO content on properties of CCTO hollow fibers. The finding in this study could lead to a new direction to enhance the properties of HFS with potential application in membranes.


Author(s):  
Rizki Firsta Wahyuliswari ◽  
Siswanto ◽  
Prihartini Widiyanti

Polysulfone is synthetic polymer widely used as basic material for dialyzer membrane and hydrophobic so it tends to cause fouling. Cellulose acetate is non-synthetic, hydrophilic polymer which has low tendency of fouling and has good thermal stability and permeability so it is considered as alternative material for hollow fiber dialyzer. A proper hollow fiber can be achieved by setting a proper temperature of coagulation bath along the spinning process. This research aims to understand the effect of coagulation bath temperature variations on the physical characteristic such as pore size, tensile strength, swelling rate and creatinine clearance of cellulose acetate – D-glucose monohydrate hollow fibers. Hollow fibers were fabricated using spinneret at temperature variations 5°C, 10°C, 15°C dan 20°C. Physical characteristics were estimated by doing morphology test using SEM, tensile test, swelling test towards Simulated Body Fluid (SBF) and filtration test towards creatinine. Result revealed that the hollow fibers from 5°C coagulation bath temperature gives the best characteristic and performance with tensile strength 27,421 N mm-2, pore size 0,0295–0,0858 nm, swelling rate 4,18%, elongation rate 4,4 %, flux rate 1,6032–1,7956 mL cm-2 min-1 and creatinine clearance rate 40,14–48,30% so it is potential to be applied as dialyzer membrane.


Membranes ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 38 ◽  
Author(s):  
Yuanhui Tang ◽  
Yakai Lin ◽  
Hanhan Lin ◽  
Chunyu Li ◽  
Bo Zhou ◽  
...  

A treatment consisting of room temperature stretching and subsequent annealing was utilized to regulate the morphology and performance of polyvinylidene fluoride (PVDF) hollow fiber membranes. The effects of stretching ratios and stretching rates on the crystallization behavior, morphology, and performance of the PVDF membranes were investigated. The results showed that the treatment resulted in generation of the β crystalline phase PVDF and increased the crystallinity of the membrane materials. The treatment also brought about the orientation of the membrane pores along the stretching direction and led to an increase in the mean pore size of the membranes. In addition, as the stretching ratio increased, the tensile strength and permeation flux were improved while the elongation at break was depressed. However, compared to the stretching ratio, the stretching rate had less influence on the membrane structure and performance. In general, as the stretching ratio was 50% and the stretching rate was 20 mm/min, the tensile strength was increased by 36% to 7.47 MPa, and the pure water flux was as high as 776.28 L/(m2·h·0.1bar), while the mean pore size was not changed significantly. This research proved that the room temperature stretching and subsequent annealing was a simple but effective method for regulating the structure and the performance of the PVDF porous membranes.


2020 ◽  
Vol 609 ◽  
pp. 118235
Author(s):  
Qingwen Qin ◽  
Zhiyang Cheng ◽  
Zhao Cui ◽  
Guang Yang ◽  
Cheng Zhang ◽  
...  

2013 ◽  
Vol 703 ◽  
pp. 37-40
Author(s):  
Qing Zhu Zheng ◽  
Jun Sheng Yuan

In order to clarify the relationship between spinning conditions and performance parameters of hollow-fiber ultrafiltration (UF) membrane filament, polysulfone (PSF) hollow-fiber UF membrane was prepared, meanwhile, the performance parameters were investigated when the rotation rate of controlled volume pump and the winding speed of UF membrane filament is stationary. It was found that with the water flux of central tube in spinneret increase, the diameter and loading density increase, the thickness decrease, the sectional area and porosity increase, the tensile strength and fracture length increase firstly and then decrease. Comprehensively considering the appearance size and tenacity, the best water flux of central tube in spinneret is 20 ml/min.


DYNA ◽  
2015 ◽  
Vol 82 (194) ◽  
pp. 79-85 ◽  
Author(s):  
Martina Inmaculada Álvarez Fernández ◽  
Celestino González Nicieza ◽  
Maria Belén Prendes Gero ◽  
José Ramón García-Menéndez ◽  
Juan Carlos Peñas Espinosa ◽  
...  

Due to the heterogeneity of rocks, their tensile strength is around 10% of their compressive strength, which means that breakage is mainly caused by tensile stress. The measure of tensile stress is very difficult due to rock fragility, so it has usually been measured by indirect measurement methods , including the Brazilian test. However, recent works indicate that the tensile strength values obtained through the Brazilian test must be increased by almost 26%. To understand this divergence, indirect tensile tests have been monitored. The aim is to know the material deformation and load increase by means of stepwise regression. Stress fields in slightly deformed samples are analyzed and modeled (3D finite differences) with loads applied on flat and curved plates and different Young's modulus. Finally, the results are analyzed and compared with strength values reported using Timoshenko theory and Hondros' approximation.


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