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Shamim-Ara Pervin,Arun Anand Prabu,Kap-Jin Kim 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4
Structural characterization of industrial-grade poly(1,4-phenylene sulfide) (PPS) batch samples (solution- andmelt-polymerized) can only be carried out using expensive and least available solid-state NMR/high-thermal viscometer dueto their insolubility in common organic solvents even at 200 oC. In the present study, we prepared sulfonated PPS (sPPS)which is soluble in common organic solvents even at ambient temperature conditions, thereby facilitating its easiercharacterization in the solution state at R.T. using FTIR, NMR, and solution-viscosity measurements. sPPS was synthesizedthrough the anionic modification of PPS using chlorosulfonic acid (ClSO3H) and dichloromethane as a function of varyingPPS:ClSO3H mole ratio (1:5 and 1:10) and sulfonation time (1 to 48 h). A previously unreported methodology to identify thebranching types (phenylene and sulfide branching) in PPS was carried out using 1H-NMR curve-fitting analysis withLorentzian equation. Melt-polymerized PPS samples were analyzed to contain about two times higher degree of branchingthan the solution-polymerized PPS ones.
Shamim-Ara Pervin,김갑진,Arun Anand Prabu,이용택 한국고분자학회 2015 Macromolecular Research Vol.23 No.1
Poly(vinylidene fluoride) (PVDF) based water purification membranes exhibit excellent thermal stability andchemical resistance, but also possess inherent drawbacks such as severe membrane fouling, lower separation efficiency andwater flux due to its hydrophobic nature. In the present study, we attempted to enhance the hydrophilicity of PVDFmembranes by treating with varying content (0 to 3 wt%) of partially sulfonated poly(1,4-phenylene sulfide) (sPPS)component using phase-inversion process. Compared to neat PVDF membrane, the PVDF/sPPS blend membranesexhibited typical asymmetric morphology with larger finger-like pores, efficient distribution of hydrophilic SO3-groups and decreasing water contact angle (WCA) upto 62o (77o for neat PVDF) as confirmed from scanning electronmicroscope (SEM), energy dispersive X-ray spectroscopy (EDX) and contact-angle measurements, respectively. Studies carried out for pure water flux (880 L/m2h) and blood serum albumin (BSA) solution flux (185 L/m2h)confirmed the enhanced permeability and higher fouling resistance for PVDF-sPPS (3 wt% sPPS) membranescompared to neat PVDF membrane (175 L/m2h and 63 L/m2h, respectively), though the BSA flux decreased withan increase in the filtration time due to membrane fouling. Compared to the total organic carbon (TOC) values ofpoly(ethylene oxide) (PEO) aqueous solutions before permeation (189.9 mg/L for Mw=100,000 and 75.68 mg/L forMw=300,000), TOC of neat PVDF membrane decreased to 15 mg/L for Mw= 100,000 and 5 mg/L for Mw=300,000. Withincreasing sPPS content, the TOC values showed an increasing trend due to their increasing pore size. Overall, theincorporation of sPPS in PVDF membrane lowered the WCA, enhanced fouling resistance and improved its permeabilityand selectivity, which exemplifies the importance of this study.