جستجوی مقالات مرتبط با کلیدواژه "vinyl pyrrolidone" در نشریات گروه "شیمی"

Hydrogels are 3-Dimensional (3-D) polymers that are water-insoluble. The functional groups in Hydrogels lead to water absorption and swell. In the Interpenetrating polymer network (I.P.N), polyvinyl sulfonic acid P(VSA) is imprisoned in the cross-linked polyvinyl pyrrolidone (PVP) because of the higher Maxwell energy of PVP rather than P(VSA).In this work, we prepared co-hydrogels by free radical polymerization method using the two monomers PVP and PVSA. The azobisisobutyronitrile (AIBN) as an initiator and N,N-methylen-e-bisacrylamide as a cross-linker agent was used at 65ċ for five hours and 45 minutes. We prepared co-hydrogels in 1:1,1:0.5,and 1:0.25 mole ratios on feed composition. Therefore, we obtained amphiphilic hydrogels to study the complexation behavior between the two cationic and anionic monomers. Uv-Spectrometry was performed. For the first time, the structural properties were identified by FT-IR. We investigated the swelling properties of synthesized co-hydrogels (Amphiphilite hydrogels) at different temperatures. The optimum temperature for the synthesized co-hydrogels was obtained.

Hydrogels are 3-Dimensional (3-D) polymers that are water-insoluble. The functional groups in Hydrogels lead to water absorption and swell. In the Interpenetrating polymer network (I.P.N), polyvinyl sulfonic acid P(VSA) is imprisoned in the cross-linked polyvinyl pyrrolidone (PVP) because of the higher Maxwell energy of PVP rather than P(VSA).In this work, we prepared co-hydrogels by free radical polymerization method using the two monomers PVP and PVSA. The azobisisobutyronitrile (AIBN) as an initiator and N,N-methylen-e-bisacrylamide as a cross-linker agent was used at 65ċ for five hours and 45 minutes. We prepared co-hydrogels in 1:1,1:0.5,and 1:0.25 mole ratios on feed composition. Therefore, we obtained amphiphilic hydrogels to study the complexation behavior between the two cationic and anionic monomers. Uv-Spectrometry was performed. For the first time, the structural properties were identified by FT-IR. We investigated the swelling properties of synthesized co-hydrogels (Amphiphilite hydrogels) at different temperatures. The optimum temperature for the synthesized co-hydrogels was obtained.

In this work, we prepared co-hydrogel with two monomers of vinyl pyrolidone and vinyl sulfonic acid by free radical polymerization metod and azobisisobutyronitrile (AIBN) is a initiator ,and N,N-methylen ebisacryl amide is an crosslinker agent in 65ċ and 5 hours and 45 minutes.we synthesized co-hydrogel 1:1,1:0.5,1:0.25 mol ratio on feed composition. there for we obtain amphiphilic hydrogels. for invistigation of complexation behavior between two monomer (cationic and anionic monomer) we used uv spectroscopy. there for, we invistigation of swelling properties of synthesized co-hydrogels (amphiphilite hydrogels)in different PH 1,4,7,10,12 also we obtaine ratio amount of swelled hydrogel.

Water is one of the most important chemicals and vital fluids without which living things are impossible. Today, many factors cause environmental water pollution that in this article, we try to absorb nitrophenol derivatives from contaminated water by poly co-hydrogel (vinylpyrrolidone-co-allylamine hydrochloride). Today, many factors cause pollution of environmental waters. In this article, we tried to absorb nanonitrophenol derivatives from contaminated water by co-hydrogel (vinyl pyrrolidone-co-allylamine hydrochloride). In this project, free radical polymerization at 70°C for 5 hours and 20 minutes using A.I.B.N as the initiator of N and N 'methylene base acrylamide as a crosslinking agent were prepared. then, the uptake of nitrophenol toxin from contaminated water by hydrogels was investigated. In this work, 5 to 20 ppm of nitrophenol and the amount of 0.02, 0.05, 0.1 g of hydrogel in different monomeric ratios (1:1, 1: 0.5, 1:2 The amount of adsorption was measured, which increased with increasing the amount of hydrogel and also increasing the concentration of nitrophenol.

Malva sylvestris is one of the most important plants used in pharmaceutical and cosmetic industries is the health of most developed countries. The juice is a potent anti-oxidant strong disinfectant. The leaves and flowers of this plant have a great application in the provision of Medicine and treatment in traditional medicine. In this research, Malva sylvestris was collected from the Anzan Meshgin-Shahr area in the northwest of Iran. The essential oil was extracted by Clevenger's apparatus, GC and GC/MS devices were used for analysis of essential oil compounds and accurate measurements of the compounds. Then, the effect of the essential oil of the Malva sylvestris and  control on the common bacteria of the oral infection evaluated in two ways: Disc deffusion And minimum inhibitory concentration (MIC). According to the results, the essential oil of the herb has a significant inhibitory effect on the types of gram negative and positive bacteria. Also, comparing the diameter of the non-growth of the plant with chlorhexin, it was found that the essence of the herb medicine showed relatively similar results to that of the chlorhexin.  According to the findings, essential oil of the herb has a good anti-microbial effect against the common bacteria of oral infections. As a result, the essential oil of this plant with different concentrations, after completing studies, can be an appropriate alternative for chemical drugs and chemical mouthwashes in the treatment of oral bacterial infections.

Hydrogels are three-dimensional polymers that do not dissolve in water but swell. one of the most important physical properties of hydrogels is their swelling in water. Polyvinyl pyrrolidone has a wide range of applications due to its biocompatibility. methacrylic acid also has many uses due to its COOH group. In this project, using free radical polymerization at 65 °C for 5 hours and 45 minutes, using AIBN as an initiator and methylene bisacrylamide as a crosslinking agent, cohydrogels (vinyl pyrrolidone-methacrylic acid) were prepared and at different pH, temperature and intensity of ions were examined. The maximum inflation was obtained at pH = 12 and in the ratio of 1:1 equal to 8000% and the minimum inflation was obtained at pH = 2 in the ratio of 1: 2. FTIR was used for structural identification and T.G.A. for thermal identification, the maximum degradation for these hydrogels was at 75 ° C, due to high swelling.