Polymer Research Group

Anyang, South Korea

Polymer Research Group

Anyang, South Korea

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Kim Y.J.,Polymer Research Group | Ha S.-T.,Polymer Research Group | Lee G.J.,Polymer Research Group | Nam J.H.,Polymer Research Group | And 7 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2013

This paper reported a research on space charge distribution in low-density polyethylene (LDPE) nanocomposites with different types of graphene and graphene oxide (GO) at low filler content (0.05 wt%) under high DC electric field. Effect of addition of graphene oxide or graphene, its dispersion in LDPE polymer matrix on the ability to suppress space charge generation will be investigated and compared with MgO/LDPE nanocomposite at the same filler concentration. At an applied electric field of 80 kV/mm, a positive packet-like charge was observed in both neat LDPE, MgO/LDPE, and graphene/LDPE nanocomposites, whereas only little homogenous space charge was observed in GO/LDPE nanocomposites, especially with GO synthesized from graphite nano fiber (GNF) which is only ~100 nm in diameter. Our research also suggests that dispersion of graphene oxide particles on the polymer matrix plays a significant role to the performance of nanocomposites on suppressing packet-like space charge. From these results, it is expected that nano-sized GO synthesized from GNF can be a promising filler material to LDPE composite for HVDC applications. Copyright © 2013 American Scientific Publishers.


Kenawy E.-R.,Polymer Research Group | El-Shanshoury A.E.-R.R.,Bacteriology Research Unit | El-Shanshoury A.E.-R.R.,Taif University | Omar Shaker N.,Al - Azhar University of Egypt | And 4 more authors.
Main Group Chemistry | Year: 2013

In the present work new biocidal polymers were synthesized based on linear poly(hydroxy styrene) and poly(hydroxy styrene co-2-hydroxyethyl methacrylate). The polymer and the copolymer were modified by chloroacetylation with chloroacetyl chloride and were further modified by quaternization with triethylamine, triphenylphosphine, and tributylphosphine. The modified polymers, and copolymers were characterized by elemental analyses, IR, and 1H-NMR. The biocidal activities of the compounds were evaluated against E. coli, Staph. aureus, P. aeruginosa, Serratia sp, Kelbsiella sp. and C. albicans. The modified polymers and copolymers had biocidal activity. The toxicity analysis of the most active polymers or co-polymers to Artemia salina was also determined. It differed according to the polymer or co-polymer and its concentration. © 2013 - IOS Press and the authors. All rights reserved.


Kenawy E.-R.,King Saud University | Kenawy E.-R.,Polymer Research Group | Al-Deyab S.,King Saud University | El-Newehy M.H.,King Saud University | El-Newehy M.H.,Polymer Research Group
Molecules | Year: 2010

Segmented polyurethanes containing azo aromatic groups in the main chain were synthesized by reaction of 3,3'-azobis(6-hydroxybenzoic acid) (ABHB), 5-[4(hydroxyphenyl)azo] salicylic acid (HPAS), and 5-[1-hydroxynaphthyl)azo] salicylic acid (HNAS) with hexamethylenediisocyanate (HDI). All synthesized monomers and polymers were characterized by elemental analysis, FTIR, 1H-NMR spectra, TGA and DSC analysis. All the synthesized azo polymers showed good thermal stability and the onset decomposition temperature of all these polymers was found to be above 195 °C under nitrogen atmosphere. The release of 5-ASA under physiological conditions (pH = 7.8 and pH = 1.5) was investigated at body temperature (37 °C). The release rate of 5-ASA increased with increasing pH (i.e., 7.8 > 1.5). Copyright © 2010 by the authors.


Kenawy E.-R.,King Saud University | Kenawy E.-R.,Polymer Research Group | El-Newehy M.H.,King Saud University | El-Newehy M.H.,Polymer Research Group | Al-Deyab S.S.,King Saud University
Journal of Saudi Chemical Society | Year: 2010

Physically crosslinked polymeric films containing atenolol drug were formulated and the release of the drug was evaluated with view to investigate the feasibility of these films as drug delivery systems. Freezing and thawing process for PVA was used to prepare a controlled release device for atenolol drug. The process included incorporation of the drug into PVA film during the freezing and thawing process. The PVA has used a molecular weight of 125 k and degree of saponification of 98. Various amounts of the atenolol drug were incorporated into the freeze/thawed PVA. The in vitro release behavior of atenolol from these films was investigated. The drug release profiles from the polymeric formulations indicated initial high rate of release followed by slow rate of the release. The release of atenolol increased with increasing drug concentration in the film. The results showed the feasibility of the use of freezing and thawing technique to control the release of atenolol drug from PVA. © 2010.


Kayalvizhy E.,Bharathiar University | Pazhanisamy P.,Polymer Research Group
International Journal of Biological Macromolecules | Year: 2016

In this study, poly(N-cyclohexylacrylamide-co-acrylamide/sodium 2-acrylamido-2-methyl propanesulfonate) gold nanocomposite hydrogels were synthesized by free-radical copolymerization in methanol/water at 60 °C. The gold nanocomposites hydrogels were prepared via in situ polymerization using gold nanoparticle. The weight percentage of N-cyclohexylacrylamide (NCA) and acrylamide (AM) monomers was fixed 50:50 and the weight of sodium 2-acrylamido-2-methylpropanesulfonate (AMPSNa) was varied from 0.1 to 0.5 g. The swelling behavior of gold nanocomposite hydrogels was studied by gravimetric method and it was found that swelling increases as the amount of sodium 2-acrylamido-2-methylpropanesulfonate increases. The surface morphology study indicates the formation of spherical shaped gold nanoparticle in the polymer matrix. © 2016 Elsevier B.V.


PubMed | Bharathiar University and Polymer Research Group
Type: | Journal: International journal of biological macromolecules | Year: 2016

In this study, poly(N-cyclohexylacrylamide-co-acrylamide/sodium 2-acrylamido-2-methyl propanesulfonate) gold nanocomposite hydrogels were synthesized by free-radical copolymerization in methanol/water at 60 C. The gold nanocomposites hydrogels were prepared via in situ polymerization using gold nanoparticle. The weight percentage of N-cyclohexylacrylamide (NCA) and acrylamide (AM) monomers was fixed 50:50 and the weight of sodium 2-acrylamido-2-methylpropanesulfonate (AMPSNa) was varied from 0.1 to 0.5 g. The swelling behavior of gold nanocomposite hydrogels was studied by gravimetric method and it was found that swelling increases as the amount of sodium 2-acrylamido-2-methylpropanesulfonate increases. The surface morphology study indicates the formation of spherical shaped gold nanoparticle in the polymer matrix.

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