Amphiphilic block copolymers comprise a fascinating class of smart materials due to their unique ability self-organize, making them attractive candidates for wide range applications in engineering and medical sciences. The synthesis these commonly involves harmful solvents, especially classical living anionic polymerization. With the development reversible addition–fragmentation chain transfer (RAFT) polymerization–induced self-assembly (PISA), an environmentally more friendly versatile...

Blue-light-induced RAFT polymerization was utilized to synthesize poly(N,N-dimethylacrylamide)–block–polystyrene (PDMA–b–PS) diblock copolymers obtain 40 g per batch for membrane fabrication. Larger isoporous membranes (≈ 0.5 m · 0.3 m) with pore diameters of ≈ 25 nm in the dry state and around 4 wet were obtained by combination self-assembly non-solvent induced phase separation (SNIPS). Membranes post-modified hydrochloric acid impart negatively charged, pH-responsive poly(acrylic...

Influence of batch dimensions and blue light intensity on the kinetics photo-iniferter RAFT polymerization four different monomers is investigated.

Although the adsorption of proteins on Mg surface was ascribed to be main reason for effect magnesium (Mg) degradation, few studies about were performed due labile circumstances during immersion. In present study, bovine serum albumin (BSA) and fibrinogen (Fib) after immersion extensively investigated in different media first time. The results revealed that BSA Fib showed a similar trend immersion, they adsorbed more Hank's balanced salt solution (HBSS) than Dulbecco's modified Eagle medium...

A novel inside isoporous hollow fiber membrane is prepared using the dry-jet wet spinning technique. Subsequently, self-assembly of block copolymer in combination with nonsolvent-induced phase separation takes place lumen side spun fibers a diameter less than 1 mm leading to technologically favored membranes for water purification.

Hollow fiber membranes (HFM) are fabricated from blend solutions of a polyethersulfone (PESU) with sulfonated PESU (sPESU) or polyphenylenesulfone (sPPSU). The influence different additives in the dope solution and bore fluids on HFM studied. addition poly(sodium 4-styrene sulfonate) (PSSNa)/ethylene glycol (EG) to results an increased water flux compared its counterparts without this additive system. morphology hollow fibers is examined by scanning electron microscopy (SEM). inner surface...

Fabrication of evaporation-induced self-assembled structures on easily accessible surfaces is an established strategy, while achieving such microphase-separated in compact geometries has been a long-standing goal. The requirement comparatively less concentrated block copolymer (BCP) solution to pass through the significantly reduces stimulations required for self-assembly. high polymer relaxation rates and decreased thermodynamic driving forces, as well capillary suction dilute solutions...

A double-layer hollow fiber is fabricated where an isoporous surface of polystyrene-block-poly(4-vinylpyridine) fixed on a support layer by co-extrusion. Due to the sulfonation material, delamination two layers suppressed without increasing number subsequent processing steps for composite membrane formation. Electron microscope-energy-dispersive X-ray spectroscopy images unveil existence high sulfur concentration in interfacial region which in-process H-bond formation between evidenced. For...

We investigated the self-assembly of block copolymers during hollow fiber membrane (HFM) fabrication by conducting in situ small angle X-ray scattering (SAXS) and ex scanning electron microscopy (SEM) studies. SAXS enables us to follow structural rearrangements after extrusion at different distances from spinning nozzle. The kinetics process is examined as a function composition copolymer solutions parameters. studied influence rate on microdomains their weakly segregated ordered solutions....

The conventional fabrication of isoporous membranes via the evaporation-induced self-assembly block copolymers in combination with non-solvent induced phase separation (SNIPS) is achieved under certain environmental conditions. In this study, we report a modification process (isoporous) flat sheet which by providing controlled evaporation conditions using gas flow and introduced as gSNIPS. This approach can not only trigger control microphase but also provides structure formation much...

Despite the need for sophisticated instrumentation, breath figure assembly (BFA) methods are restricted to produce macroporous films on a tiny scale so far. The current study narrates fabrication of in hollow fiber geometry which extends adopt method continuous production isoporous surfaces from commercially available low-priced polymer materials. is carried out by co-centric quadruple orifice spinneret through four different liquids co-extruded simultaneously: bore fluid (to fill lumen...

Polyethersulfone (PESU), as both a pristine polymer and component of blend, can be used to obtain highly porous foams through batch foaming. However, foaming is limited small scale slow process. In our study, we foam extrusion due its capacity for large-scale continuous production deployed carbon dioxide (CO2) water physical agents. PESU high-temperature thermoplastic that requires processing temperatures at least 320 °C. To lower the temperature with higher porosity, produced...

In this study, a triblock copolymer was used as additive to fabricate new dual layer hollow fiber membranes with hydrophilic active inner surface in order improve their fouling resistance. The polymeric components of the solutions for membrane fabrication were poly(ether sulfone), poly(N-vinyl pyrrolidone), and copolymer. consists three blocks: middle hydrophobic sulfone) block two outer alkyl poly(ethylene glycol) blocks. By varying concentration solutions, it possible that are...

Since membranes made of open porous polymer foams can eliminate the use organic solvents during their manufacturing, a series previous studies have explored foaming process various polymers including polyethersulfone (PESU) using physical blowing agents but failed to produce ultrafiltration membranes. In this study, blends containing different ratios PESU and poly(N-vinylpyrrolidone) (PVP) were used for preparation open-celled foams. batch experiments involving combination supercritical CO2...

Abstract In this study, we focus on membranes of polyethersulfone and poly( N ‐vinyl pyrrolidone) elucidate the influence composition rheological, diffusion precipitation properties solutions which are used for membrane preparation via a non‐solvent‐induced phase separation process. The low‐molar‐mass component solution is mixture solvent ‐methyl‐2‐pyrrolidone non‐solvent glycerol. Cloud point, viscosity measurements as well experiments were performed in order to achieve comprehensive...

Abstract Polyethersulfonbasierte Hohlfasermembranen mit einer hydrophil funktionalisierten Trennschicht wurden hergestellt und untersucht. In die wurde ein amphiphiles Triblockcopolymer verschiedenen Konzentrationen integriert. Um eine gesteigerte Hydrophilie damit assoziiertes verringertes Fouling zu erreichen, bestehen Blockcopolymere aus zwei äußeren Poly(ethylenoxid)‐Blöcken. Diese flankieren den inneren Polyethersulfonblock, welcher der Verankerung des Additivs in Membran dient....

Front Cover: Double-layer hollow fiber: the inner layer of fiber is made a blend polyethersulfone (PES) and sulfonated (SPES) outer polystyrene-block-poly(4-vinylpyridine) diblock copolymer (PS-b-P4VP). The fabricated by SNIPS process where an isoporous structure formed on surface due to self-assembly block chains asymmetric substructure results from non-solvent induced phase separation. Further details can be found in article N. Noor, J. Koll, M. Radjabian, C. Abetz, V. Abetz* page 414.