Improved permeation performance and fouling-resistance of Poly(vinyl chloride)/Polycarbonate blend membrane with added Pluronic F127

The aim of this work was to prepare and characterize poly(vinyl chloride) (PVC)/polycarbonate (PC) blend membranes for use in ultrafiltration. Pluronic F127 was used as an additive to modify the membrane surface of the PVC/PC blended membranes. The PVC/PC blend membrane was first prepared using the phase inversion method from a casting solution of PVC with small amount of PC in N-methylpyrrolidone (NMP) and water as the non-solvent. The morphologies structure and properties, such as tensile strength, water flux, and bovine serum albumin (BSA) rejection of the blend membrane were studied. Increased amounts of PC resulted in an increase in the water flux and ability to reject protein. A concentration of 0.75 wt% PC provided the best improvement in tensile strength of blend membrane. Addition of different amounts of pluronic F127 to the casting solution of PVC/PC with a PC concentration of 0.75 wt% resulted in a decrease in the water contact angle that demonstrated the improvement of hydrophilicity of blend membrane. Scanning electron microscopy photographs showed that the modified PVC/PC membranes had a bigger pore volume in the porous sub-layer compared to the PVC/PC control membrane. The PVC/PC membrane with added Pluronic F127 exhibited a much higher flux and rejection of BSA in a protein filtration experiment than the PVC/PC membrane. An increase in flux recovery ratio of PVC/PC/pluronic 127 blend membrane indicated that the modified membranes could reduce membrane fouling useful for ultrafiltration

Etude des relations entre transfert de matière et structuration lors de l'élaboration de membranes de poly(ether-imide) par séparation de phase induite par absorption de vapeur d'eau

MONTPELLIER-BU Sciences (341722106) / SudocSudocFranceF

Synthesis and characterization of triglyceride-based copolymer from soybean oil

IATE Axe 4 : Biotechnologie microbienne et enzymatique des lipides et des agropolymères Contacts : [email protected], [email protected], [email protected], [email protected], [email protected] objective of this research is to develop bioplastic from soybean oil. Triglyceridebased copolymers were prepared from free radical copolymerization between acrylated epoxidized soybean oil (AESO) and methyl mathacrylate (MMA). AESO was synthesized by acrylation reaction with acrylic acid. Triethylamine was used as a catalyst and hydroquinone was used as a free radical initiator. The numbers of acrylate groups in soybean oil were determined by using the nuclear magnetic resonance spectroscopy (1H-NMR). Then AESO was copolymerized with MMA as a comonomer to form rigid polymer using 1 wt% of benzoyl peroxide as a free radical initiator. The mixture was cured at 90-100°C for 30 min in the oven. The effect of MMA content between 30-60 pph (part per hundred) based on weight of AESO was also studied. The transparent bioplastic, AESO-PMMA copolymer, are characterized by using the Fourier transform infrared spectrometer (FTIR) to confirm molecular structure. The glass transition temperature was determined by using dynamic mechanical thermal analysis (DMTA). The thermal resistance is analyzed by using thermogravimetric analysis (TGA). The tensile and tear properties were investigated as well

Electrospun poly(bisphenol A-co-4-nitrophthalic anhydride-co-1,3-phenylenediamine) fibers: Preparation and potential for use in filtration applications

Poly(bisphenol A-co-4-nitrophthalic anhydride-co-1,3-phenylenediamine) (PEI) fibers were successfully prepared byelectrospinning from PEI solutions in dichloromethane (DCM), 1,2-dichloroethane (DCE), N-methylpyrrolidone (NMP) andcertain mixtures between NMP and N,N-dimethylformamide (DMF). Electrospinnability of PEI solutions in NMP was greaterthan that in DCM and DCE. The addition of DMF with NMP for the preparation of PEI solutions helped improve electrospinnabilityof the PEI solutions. The effect of solution concentration on morphological appearance and/or size of the obtainedproducts was investigated. At low concentrations of the PEI solutions, discrete beads and/or beaded fibers was formed.Smooth fibers were obtained at the highest concentration investigated, i.e., 20% (w/v). The size of the obtained fibers wasfound to be an increasing function with the solution concentration or, to be exact, the solution viscosity. The water fluxesthrough the electrospun fiber mats prepared from 20% (w/v) PEI solutions in 75/25 and 50/50 NMP/DMF mixtures wereinvestigated in comparison with the films prepared by phase immersion-precipitation technique. The fiber mats exhibitedmuch greater fluxes of water than the films, which implied their potential for uses as filtration membranes

Adsorption of Pb 2+

Gelatin and activated carbon materials have been combined together to obtain a gelatin/activated carbon composite bead form which is ecofriendly, nontoxic, biocompatible, and inexpensive material. In this paper, gelatin/activated carbon adsorption for Pb2+ ions from aqueous solutions was studied experimentally under various conditions. The experimental conditions such as contact time, solution pH, and gelatin/activated carbon dosage were examined and evaluated by using batch adsorption experiments. The maximum adsorption capacity of gelatin/activated carbon for Pb2+ ions was obtained to be 370.37 mg g−1. This maximum capacity was comparable with that of commercial ion exchange resins and it was much higher than those of natural zeolites. The uptake process for Pb2+ ions was found to be relatively fast with 92.15% of the adsorption completed in about 5 min in batch conditions. The adsorption capacity was also strongly solution pH dependent. Adsorption was observed at pH value as low as 2.0 and maximum adsorption was achieved at a pH of approximately 5. The results indicated that the gelatin/activated carbon was effective to be used as an adsorbent for Pb2+ ions removal in wastewater treatment.Full Tex