REVIEWON RECENT APPLICATIONS OF ANTIMICROBIAL AGENTS FOR POLYAMIDE AND POLYPROPYLENE
A.
RAMADAN
National Research Centre ,Textile Research Division , Proteinic & Synthetic Fibers Department, Dokki, Cairo, Egypt
author
S.
GAWISH
National Research Centre ,Textile Research Division , Proteinic & Synthetic Fibers Department, Dokki, Cairo, Egypt
author
text
article
2012
eng
The growth of microbes on textiles during use and storage, will affects the wearer as well as the textile itself. The detrimental effects can be controlled by durable antimicrobial finishing of the textile using broad-spectrum biocides or by incorporating the biocide into synthetic fibers during extrusion. Consumers’ attitude towards hygiene and active lifestyle has created a rapidly increasing market for antimicrobial textiles, which in turn has stimulated intensive research and development. This article is a review based on recent applications of antimicrobial agents to Polyamide (PA) and Polypropylene (PP) fabrics.
The requirements for antimicrobial polyamide and polypropylene fibers such as, qualitative and quantitative evaluations of antimicrobial efficacy, the application methods of antimicrobial agents and some of the most recent developments in antimicrobial treatments of these fibers using various active agents ie silver, quaternary ammonium salts, polyhexamethylene biguanide, triclosan, chitosan, N-halamine compounds andfixation of antibiotics are discussed.
Al-Azhar Bulletin of Science
Al-Azhar University, Faculty of Science (Boys)
1110-2535
23
v.
Issue 2-A
no.
2012
1
28
https://absb.journals.ekb.eg/article_7202_e83ecc2b53456446f6b6d342ede5f159.pdf
dx.doi.org/10.21608/absb.2012.7202
JOJOBA AND CASTOR OILS AS FLUID OF BIOBASED GREASES: A COMPARATIVE STUDY
REFAAT
EL-ADLY
Egyptian petroleum Research Institute, Nasr City, Cairo, Egypt
author
A.
BEDIER
Department of Chemistry, Faculty of Science, Al-Azhr University, Cairo, Egypt
author
F.
MODATHER
Egyptian petroleum Research Institute, Nasr City, Cairo, Egypt
author
text
article
2012
eng
The search for environmentally friendly materials that have the potential to replace mineral oil in various industrial applications is considered a priority research in the lubricant, fuel and energy sectors. Accordingly, vegetable oils seem to be a significant potential base fluid and a substitute for mineral oil as grease formulation. The aim of this paper is to study the comparison of jojoba and castor oils as base fluids for producing lithium lubricating greases. In this respect, the sulfurization of jojoba and castor oils was carried out at temperatures ranging from 110 to 170oC. The physicochemical properties of Sulfurized jojoba and castor oils are found better than non- Sulfurized oils. The flow and viscoelastic properties of these oils have been studied by programmable Rheometer HADV-III ultra system that operates in either a steady rotation or in an oscillatory mode. The obtained data reveal that the flow behavior depends to a large extent on the nature of the aforementioned oils. Jojoba oils exhibit properties close to castor oil except for oxidation stability which is better in case of jojoba oil. The influence of these oils and their Sulfurized products on the properties of the prepared biogreases was studied. The data obtained in this investigation indicate that the prepared biogreases from Sulfurized oils had superior properties with respect to dropping point and consistency compared to non- Sulfurized oils. The prepared greases from jojoba oil and its sulfurized product showed improvement in oxidation stability than corresponding grease based on castor oil or its sulfurized product. An opposite trend was observed concerning the consistency and flow properties. It is concluded that the jojoba and castor oils showed appropriate properties to be used as fluids for bio-lubricating greases. In addition, performance characteristics of the obtained greases are largely dependent on the type of base fluid.
Al-Azhar Bulletin of Science
Al-Azhar University, Faculty of Science (Boys)
1110-2535
23
v.
Issue 2-A
no.
2012
29
44
https://absb.journals.ekb.eg/article_7203_9eee12c7f0616a4faed389d93176af08.pdf
dx.doi.org/10.21608/absb.2012.7203
VALIDATED STABILITY INDICATED RP-HPLC METHOD FOR SIMULTANEOUS DETERMINATION OF METHYL SALICYLATE, CAMPHOR AND MENTHOL IN CREAM PREPARATIONS
I.
ABD ELLAH
Department of chemistry, faculty of science, Al-Azher University, Naser city, Cairo, Egypt
author
M.
ELNAWAWY
Department of chemistry, faculty of science, Al-Azher University, Naser city, Cairo, Egypt
author
A.
ELEWA
Methodology department, Medizen pharmaceutical industries, Borg-Alarab, Alexandria, Egypt
author
text
article
2012
eng
A method for the determination of three active products in pharmaceutical preparation Rheumatizen topical cream was described. The method was based on isocratic elution of Methyl Salicylate, Camphor and Menthol on reversed phase column C8 Thermo hyperseal 250mm x 4.6mm 5µm - using a mobile phase consisting of mixture of 45% Acetonitrile: 55% (Water+0.2% Triethyl amine adjusted to pH 5 with acetic acid)at a flow rate of 1 ml/min. Quantization was achieved with Refractive index (RI) detector. Linearity of Methyl Salicylate, Camphor and Menthol was found to be from (2.4 mg/ml to 9.6 mg/ml), (0.32 mg/ml to 1.28 mg/ml) and (0.8 mg/ml to 3.2 mg/ml), with variation coefficient 0.9998, 0.997 and 0.998 respectively. The stress testing was carried out by using the solutions that had been treated with [2M NaOH, 2M HCl and 30%H2O2] and all of these solutions were leaved for 22 hours at room temperature in tightly closed containers without further heating to avoid the loss via evaporation of the analyets due to their volatility character.
Al-Azhar Bulletin of Science
Al-Azhar University, Faculty of Science (Boys)
1110-2535
23
v.
Issue 2-A
no.
2012
45
60
https://absb.journals.ekb.eg/article_7204_62beec4484059a1937b7d6f4c6eee504.pdf
dx.doi.org/10.21608/absb.2012.7204
SYNTHESIS AND CHARACTERIZATION OF A NONIONIC SURFACTANT AS A CORROSION INHIBITOR FOR STEEL IN 1.0 M HCL.
S.
SOLIMAN
Chemistry Department, Faculty of Science, Al -Azhar University, Cairo, Egypt.
author
M.
METWALLY
Chemistry Department, Faculty of Science, Al -Azhar University, Cairo, Egypt.
author
S.
SELIM
Chemistry Department, Faculty of Science, Al -Azhar University, Cairo, Egypt.
author
M.
BEDAIR
Chemistry Department, Faculty of Science, Al -Azhar University, Cairo, Egypt.
author
text
article
2012
eng
Synthesis, adsorption and corrosion inhibiting effect of new nonionic surfactant consisting of 3-[(4-Dimethylamino-benzylidene)-amino]-4-hydroxy-benzenesulphonic acid as hydrophobic part and poly ethylene glylcol (poly ethylene oxide) on steel in 1.0 M HCl was investigated using weight loss and potentiodynamic polarization techniques. The experimental findings revealed that this compound inhibited the corrosion reaction in 1.0 M HCl environment. The results indicated that this surfactant was adsorbed on the metal/solution interface. A theoretical study of the adsorption behavior of this compound was carried out in the framework of the semiempirical (SE) and molecular dynamics (MD).
Al-Azhar Bulletin of Science
Al-Azhar University, Faculty of Science (Boys)
1110-2535
23
v.
Issue 2-A
no.
2012
77
96
https://absb.journals.ekb.eg/article_7205_a6380b0154fdae191149f3c7f4cbacec.pdf
dx.doi.org/10.21608/absb.2012.7205
EFFECT OF ALKALI METAL IONS ON DIFFERENT ZEOLITES FOR ALKYLATION OF CUMENE
MOHAMED
ABDALAH
Department of Chemistry, Faculty of science, Al-Azhar University, Assiut 71524, Egypt
author
text
article
2012
eng
The effects of alkali metal treatment on different zeolite catalysts are investigated to better understand the nature of alkali metal species for the selective catalytic alkylation of cumene by ethylene.
H-ZSM5, Y and BEA zeolite catalysts with various molar ratios of K, Rb, and Cs are prepared by ion exchange method and calcined at 550 oC in air atmosphere for 2 h. The study was carried out at 300, 350, 400 and 450 °C for reaction times of 2 hours. Cumene conversion was found to increase with all different alkali metal additions and the reaction temperatures. The catalysts are characterized by temperature-programmed desorption of NH3/ or CO2 (TPD), Fourier transform infrared (FT-IR) after pyridine adsorption and inductively-coupled plasma emission spectrometry (i.c.p.e.s.). The FTIR results are compared to Lewis and Broensted acid sites. Furthermore, the relation between atomic size of alkali metal ion exchanged and the basicity of the catalyst is discussed. Among them the 0.025 M Cs exchanged is found as very active catalyst for alkylation of cumene with ethylene resulted in amyl benzene, styrene and ethyl benzene.
Al-Azhar Bulletin of Science
Al-Azhar University, Faculty of Science (Boys)
1110-2535
23
v.
Issue 2-A
no.
2012
97
112
https://absb.journals.ekb.eg/article_7207_8ae7004004443ca8acb1f7919d0b4545.pdf
dx.doi.org/10.21608/absb.2012.7207
THE UTILITY OF BENZOYLCHROMENE AND 2-IMINOCHROMENE-3-CARBOXAMIDE DERIVATIVES FOR THE SYNTHESIS OF PYRANOCHROMENES, CHROMENOPYRANO(PYRIMIDINE)PYRIDINE, CHROMENO(PYRIDINES)QUINOLINE AND THEIR ANTIMICROBIAL EVALUATION
HAMDY
THABET
Chemistry Department, Faculty of Science, Al-Azhar University, 11284 Nasr City, Cairo, Egypt.
author
AHMED
HALAWA
Chemistry Department, Faculty of Science, Al-Azhar University, 11284 Nasr City, Cairo, Egypt.
author
MOHAMED
ELNASSAG
Chemistry Department, Faculty of Science, Al-Azhar University, 11284 Nasr City, Cairo, Egypt.
author
AHMED
HASSAN
Chemistry Department, Faculty of Science, Al-Azhar University, 11284 Nasr City, Cairo, Egypt.
author
text
article
2012
eng
Some new pyrano[3,4-c]chromene derivatives (4,5,9,13,14), bispyrano[3,4-c]chromene derivative (18) were synthesized via Michael addition of different active methylene compounds to benzoylchromenes 1a,b under different reaction conditions. Chromeno[4',3':4,5]pyrano[2,3-d]pyrimidine and Chromeno[4’,3’:4,5]pyrano[2,3-b]pyridine (24,28) derivatives were obtained from the condensation of 4 with formic acid and benzylidene malononitrile respectively. Novel chromeno[3,4-c]pyridine derivatives (34,37,40,43) and chromeno[3,4-c]tetrahydroquinolinedione (47) were obtained via treatment of 2-iminochromene-3-(4-ethoxyphenyl)-carboxamide (31) with acetonitrile derivatives and cyclohexanone respectively. The structures of the titled compounds cited in this article were elucidated by spectroscopic data (IR, 1HNMR and mass spectra). The antimicrobial activities of the synthesized compounds were performed and some of them display significant results.
Al-Azhar Bulletin of Science
Al-Azhar University, Faculty of Science (Boys)
1110-2535
23
v.
Issue 2-A
no.
2012
113
131
https://absb.journals.ekb.eg/article_7206_7a7df19082ad9aa50be90e42c84693d0.pdf
dx.doi.org/10.21608/absb.2012.7206
Synthesis of multifunctional acrylate monomers (MFAMs) and their applications
FAHIM
NASSAR
Department of Applied Chemistry, Faculty of Science, Al-Azhar University, Cairo, Egypt.
author
H.
NASSAR
Department of Applied Chemistry, Faculty of Science, Al-Azhar University, Cairo, Egypt.
author
F.
HAI
Department of Applied Chemistry, Faculty of Science, Al-Azhar University, Cairo, Egypt.
author
G.
AHMED
Department of Applied Chemistry, Faculty of Science, Al-Azhar University, Cairo, Egypt.
author
text
article
2012
eng
Novel multifunctional acrylate monomers (MFAMs) were synthesized by reaction of acryloyl chloride with 3,4,5-trihydroxybenzoic (Gallic) acid and diethanolamine in the presence of triethylamine as catalyst. The prepared multifunctional acrylate monomers were used as cross-linkers for the synthesis of polyacrylic acid by precipitation polymerization using 2,2'-azobisisobutyronitrile (AIBN) as free radical initiator. Differential scanning calorimetry studies showed that the glass transition temperature behavior is significantly affected by the type and amount of MFAM employed. Viscosity measurements showed that the thickening effect depend upon the cross-linker type and concentration.
Al-Azhar Bulletin of Science
Al-Azhar University, Faculty of Science (Boys)
1110-2535
23
v.
Issue 2-A
no.
2012
151
162
https://absb.journals.ekb.eg/article_7208_905a74617c7513d8589b6364afb745a8.pdf
dx.doi.org/10.21608/absb.2012.7208