Characterization for graft polymerization of alkyl methacrylate onto polydimethylsiloxane membranes by electron beam and their permselectivity for volatile organic compounds

Better hydrophobic/oleophobic properties and durability were added to polyethylene terephthalate (PET) fabrics using graft polymerization induced by pre-and simultaneous electron beam (EB) irradiation. 2-(Perfluorohexyl) ethyl acrylate (FEA), butyl acrylate (BA(C4)), dodecyl acrylate (DA(C12)), and stearyl acrylate (SA(C18)) with different alkyl chain lengths were used as vinyl monomers that can react with the radicals generated by EB irradiation. For the pre-irradiation method, the changes in weight gain were negligible. While irradiating the monomer solution and the PET fabric simultaneously, a weight gain of approximately 3%-5% was observed. Contact angle measurements confirmed, hydrophobicity/oleophobicity in the PET fabric graft polymerized with FEA and SA(C18) monomers using the simultaneous irradiation method. The addition of the alkyl acrylate monomer increased the dodecane contact angle in the order of FEA < FEA/BA(C4) < FEA/DA(C12) < FEA/SA(C18). XPS analysis showed that the surface fluorine concentrations of PET fabrics with FEA and FEA/SA(C18) monomers were 18.3% and 38.9%, respectively. The contact angle and surface fluorine concentration after rubbing decreased, but the change was small when SA(C18) monomer was added to the FEA monomer. These results indicate that the hydrophobic/oleophobic properties and durability can be improved by EB graft polymerization in combination with FEA and SA(C18) monomers.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improving the hydrophobicity/oleophobicity of polyethylene terephthalate fibrous materials using electron beam‐induced graft polymerization with 2‐(perfluorohexyl)ethyl acrylate monomer and alkyl acrylate monomer

Shohbuke

Kobayashi

Okubayashi

2022

Characterization of graft polymerization of fluoroalkyl methacrylate onto PDMS hollow‐fiber membranes and their permselectivity for volatile organic compounds

Mishima

Nakagawa

2003

Self Cite

Polydimethylsiloxane (PDMS) hollow-fiber membranes grafted with 1H,1H,9H-hexadecafluorononyl methacrylate (HDFNMA), which is a fluoroalkyl methacrylate, using a 60 Co irradiation source, were characterized and applied to pervaporation. The PDMS hollow-fiber membranes were filled with N 2 gas and sealed. The membranes and the HDFNMA solution were then irradiated simultaneously. In the HDFNMA solution, graft polymerization was performed. The degree of grafting of the outside surface of the hollow fiber was greater than that in the inside surface of the hollow fiber. In the grafted PDMS hollow-fiber membranes, the best separation performance was shown due to the introduced hydrophobic polymer, poly(HDFNMA). The grafted membrane had a microphase-separated structure, that is, a separated structure of PDMS and graft-polymerized HDFNMA. The permeability of molecules in the poly-(HDFNMA) phase was so low that the diffusion of molecules was prevented in the active layer with many poly(H-DFNMA) domains, as the feed solution was introduced through the inside of the hollow fibers and the outside was vacuumed. As the feed solution was introduced through the outside of the hollow fibers and the inside was vacuumed, the diffusion of molecules was not prevented in the active layer with few poly(HDFNMA) domains.

Removal of cesium‐134 and cobalt‐60 with radiation‐grafted copolymers from their liquid wastes

Hegazy

Kamal

Geleel

et al. 2004

ABSTRACT:The introduction of new characteristics to some synthetic polymers was achieved through the ␥-radiation-induced graft copolymerization of an acrylamide/vinyl acetate comonomer onto polypropylene films for the preparation of synthetic membranes. The influence of the reaction conditions on the grafting yield, such as the solvent and its composition and the inhibitor and its concentration, was investigated. An alkaline treatment was carried out for the prepared graft copolymer to improve its ion-exchange property. The grafted and treated membranes were characterized to determine the structural changes with X-ray diffraction and Fourier transform infrared spectroscopy. The mechanical properties, swelling behavior, and electrical conductivity for the graft copolymer were studied. Improvements in the tensile strength, electrical conductivity, and hydrophilicity with grafting were observed. The KOHtreated membranes possessed greater hydrophilic properties than the untreated ones. The possibility of practical uses for these membranes in the removal of cesium-134 and cobalt-60 from their liquid wastes was also investigated. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 936 -945, 2005