Effects of Shear Rate, Temperature, and Polymer Composition on the Shear Stress of Polyethersulfone/1-Methyl-2-pyrrolidone Cast Solutions

Ghasem, Nayef; Al-Marzouqi, Mohamed

doi:10.1021/je2002978

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…In addition, two rheological tests, (1) constant-stress viscosity and (2) dynamic oscillatory shear tests as a function of temperature, were used to investigate the thermal transition of the copolymers. It has been reported that polymer solutions are very sensitive to shear rate around their phase transition [ 78 ].…”

Section: Resultsmentioning

confidence: 99%

Synthetic Thermo-Responsive Terpolymers as Tunable Scaffolds for Cell Culture Applications

et al. 2022

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The use of tailored synthetic hydrogels for in vitro tissue culture and biomanufacturing provides the advantage of mimicking the cell microenvironment without issues of batch-to-batch variability. To that end, this work focused on the design, characterization, and preliminary evaluation of thermo-responsive, transparent synthetic terpolymers based on N-isopropylacrylamide, vinylphenylboronic acid, and polyethylene glycol for cell manufacturing and in vitro culture applications. Polymer physical properties were characterized by FT-IR, 1H-NMR, DLS, rheology, and thermal-gravimetric analysis. Tested combinations provided polymers with a lower critical solution temperature (LCST) between 30 and 45 °C. Terpolymer elastic/shear modulus varied between 0.3 and 19.1 kPa at 37 °C. Cellular characterization indicated low cell cytotoxicity on NIH-3T3. Experiments with the ovarian cancer model SKOV-3 and Jurkat T cells showed the terpolymers’ capacity for cell encapsulation without interfering with staining or imaging protocols. In addition, cell growth and high levels of pluripotency demonstrated the capability of terpolymer to culture iPSCs. Characterization results confirmed a promising use of terpolymers as a tunable scaffold for cell culture applications.

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Section: Resultsmentioning

confidence: 99%

Synthetic Thermo-Responsive Terpolymers as Tunable Scaffolds for Cell Culture Applications

et al. 2022

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“…In the case of hollow fiber spinning, dope viscosity affects the phase inversion process by controlling the solvent and nonsolvent exchange rate. 23 Figure 2 shows the dependence of the logarithmic dope solution viscosities to the reciprocals of the absolute dope solution temperatures for polymer dopes with different PES concentrations. The linear relations between the viscosity and the reciprocal of temperature fit the Arrhenius equation.…”

Section: Resultsmentioning

confidence: 99%

Effects of Spinning Temperature on the Morphology and Performance of Poly(ether sulfone) Gas Separation Hollow Fiber Membranes

Liu

Cao

2017

Ind. Eng. Chem. Res.

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In this study, we demonstrated that poly(ether sulfone) (PES) hollow fiber membranes with almost defect-free surfaces could be prepared at low PES concentrations if the hollow fibers were spun at low temperatures by dry-jet wet spinning. A series of hollow fiber membranes were spun at different coagulation batch temperatures (T c ) and dope solution temperatures (T d ). Effects of T c and T d on the membranes' morphologies and gas separation performances were investigated. Membrane morphologies characterized by using a scanning electron microscope (SEM) showed that the skin layer thicknesses increased with the decreases in T c and T d . Moreover, mean surface pore sizes of the membranes, which were evaluated by using the gas permeation method, significantly decreased as T c or T d decreased. PES hollow fiber membranes spun at the lowest temperatures (T c = 7 °C, T d = 3 °C) showed O 2 and CO 2 permeances of 18.9 and 53.5 GPU, respectively. And selectivities of O 2 /N 2 , CO 2 / N 2 , and CO 2 /CH 4 gas pairs were 1.15, 3.26, and 1.24, respectively. After silicone coating, the selectivities increased to 7.24, 47.7, and 39.4, respectively, but O 2 and CO 2 permeances decreased to 4.85 and 31.9 GPU, respectively. To our best knowledge, the gas separation performance was the test among all PES hollow fiber membranes.

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“…Moreover, thermal kinetics and colloidal stability are influenced by change of temperature. The ultimate ER demeanor depends on the balance procured among these factors [20] [21].…”

Section: The Effect Of Temperature On Shear Stressmentioning

confidence: 99%

Preparation of Smart Fluid from Polymer Coated Pumice Particles

Yılmaz¹,

Çalışkan²,

Yilmaz³

2016

WJCMP

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This study reports, electrorheological (ER) responses of pumice and poly(methyl methacrylate)/ pumice, PMMA/pumice, conducting composite dispersions in silicone oil (SO). Primarily three different compounds (K1, K2, K3, 73%, 48%, 22% contain pumice particles) PMMA/pumice composites were prepared and used as ER active materials. Anti-sedimentation stabilities of pumice and composite systems in silicone oil (SO) medium were determined. The application of a suspension of composite particles as an electrorheological ER fluid (20% particle concentration) was assessed using a rotational electro-rheometer, and the effects of the electric field strength, shear rate, frequency and temperature were examined. ER activity of all the composite suspensions was observed to increase with increasing concentration, electric field strength and decreasing shear rate. The PMMA/pumice composites suspensions show a typical shear thinning non-Newtonian viscoelastic behavior, in which viscosity of the suspension decremented sharply with incrementing shear rate. The ER measurement results showed that the performance of the composite suspensions was enhanced by increasing the electric field strength.

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Effects of Shear Rate, Temperature, and Polymer Composition on the Shear Stress of Polyethersulfone/1-Methyl-2-pyrrolidone Cast Solutions

Cited by 7 publications

References 15 publications

Synthetic Thermo-Responsive Terpolymers as Tunable Scaffolds for Cell Culture Applications

Synthetic Thermo-Responsive Terpolymers as Tunable Scaffolds for Cell Culture Applications

Effects of Spinning Temperature on the Morphology and Performance of Poly(ether sulfone) Gas Separation Hollow Fiber Membranes

Preparation of Smart Fluid from Polymer Coated Pumice Particles

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