Characterization of ethylene–vinylalcohol copolymer doped with chlorophyll

Light-Induced Switching of the Wettability of Novel Asymmetrical Poly(vinyl alcohol)-co-ethylene Membranes Blended with Azobenzene Polymers

“…One of the aims of our work was to obtain an asymmetrical membrane based on a commercial polymer blended with polyethers containing azobenzene moieties that we synthesized in our previous research . Because of good compatibility with the azo polymers in our synthesis, the high solubility in DMSO at 60 °C, and the relatively similar values of crystallization and vitrification temperatures (45 and about 40 °C, respectively), the EVAL polymer was chosen as the matrix polymer in our research. ,− …”

“…In this article, we report a new method of preparing poly(vinyl alcohol)- co -ethylene (EVAL) asymmetrical composite membranes blended with azobenzene polymers using a dry-cast process in which the introduction of rough structures onto the substrate surface and the presence of a photosensitive moiety result in a large change in wettability after UV irradiation. In our experiment, we used two types of polymers (amorphous azo-P1 or azo-P2 polymers synthesized by us (Figure ) and semicrystalline EVAL) and two different solvents (dimethylsulfoxide (DMSO) and tetrahydrofuran (THF)). EVAL was chosen as a host material because the structure of the membrane depends on the applied temperature used in the preparation (as will be explained later), and this allowed us to obtain different morphologies in the final film.…”

Enhancement of the electrical performance of poly(vinyl) alcohol by doping with chlorophyll and gamma irradiation

“…The increase of e 0 value, due to the doping of PVA with chlorophyll, is attributed to the increase of the number of dipoles in the polymer matrix. This increase of the number of dipoles is due to the probability of charge build up at the interfacial state between chlorophyll and polymer host material [1]. This interfacial state is to be expected for a mixture of two materials with different conductivities and permittivities [24].…”

“…There are several problems to be dealt with in the design and evaluation of polymeric materials for different applications [1].…”

Modification and characterization of poly(ethylene‐co‐vinyl alcohol) by glycosidation reaction

“…These qualities favor their applications as food packing and use in clinical applications as a hollow fiber dialyzer for hemodialysis 13. Many works on the modification of EVOH32 by the introduction of different amounts of functional groups, such as carboxyl groups, sulfonic groups, heparin, lysine, and ε‐caprolactone, were reported to enhance its biocompatibility and/or biodegradability 14–21. Although there were a few studies on blends of EVOH32 with polysaccharide,22 no report was made on the modification of EVOH32 by incorporating sugar moieties onto the polymer backbone.…”