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22
Section 2. Chemistry
https://doi.org/10.29013/AJT-21-5.6-9-12
Bozorov Lutfulla, Lecturer, Termez State Universityy Termez, Uzbekistan E-mail: [email protected]; [email protected] Turaev Khayit,
Doctor of Chemical Sciences, Prof., Termez State University,
Termez, Uzbekistan E-mail: [email protected] Kasimov Sherzod,
PhD in Chemistry, Associate Professor, Termez State University,
Termez, Uzbekistan E-mail: [email protected] Umbarov Ibragim,
Doctor of Technical Sciences, Prof, Termez State University,
Termez, Uzbekistan E-mail: [email protected] Eshkaraev Sadriddin, PhD in Chemistry, Termez State University,
Termez, Uzbekistan E-mail: [email protected]
MODIFICATION OF POLYVINYL CHLORIDE WITH DIPHENYLAMINE AND STUDY OF THE PHYSICOCHEMICAL PROPERTIES OF THE OBTAINED SORBENT
Abstract. To obtain new sorbents, polyvinyl chloride was synthesized by modification with dissolved diphenylamine in dimethylsulfoxide and dimethylformamides, and the structure of the resulting sorbent was studied by IR spectroscopy. Using IR spectroscopy and elementary analysis, the structure of diphenylamine-modified polyvinyl chloride was determined.
Keywords: polyvinyl chloride, diphenylamine, modification, molecule, sorbent, polymer, membrane, distilled water, dimethyl sulfoxide, dimethylformamide.
Introduction
The bond of sulfur with oxygen (S = O) in the DMSO molecule forms a dipole, ensuring its infinite solubility in water, as well as causing a high solubility of water-soluble substances in DMSO itself. Hydrogen bonds are easily formed between water molecules and DMSO, which are more stable than hydrogen bonds between water molecules. This leads to a decrease in crystal formation when the biomaterial freezes, thereby ensuring cryoprotectiveness [1].
Ion exchange materials are widely used in various fields such as pharmaceuticals, petrochemicals, hydrometallurgy and water treatment. The most important of them are the purification of natural and waste waters from cations, separation and separation of rare and precious metals and biologically active substances [2; 3].
When using ion exchange processes in practice, it is necessary to take into account the kinetic properties of the sorbent, which indicate its porosity. In this case, the study of the phase of termination of mass transfer is necessary to select the optimal process conditions, such as temperature, hydrodynamic parameters, and fractional composition of the resin. In ion exchange resins, sorption is a complex and multistep process, and usually the limiting stages determine the overall rate of the process [4].
The reactions of chemical transformation of PVC have been studied in both homogeneous and heterogeneous processes, in an organic medium and in aqueous solutions, in suspensions, in the swollen state, in a melt, and in solvent/nonsolvent systems [5].
A heterogeneous cation exchange membrane based on polyvinyl chloride-styrene-butadiene-rub-ber was obtained. To improve the osmotic properties of the membrane, 5% Fe2NiO4 was added, and the permeability to divalent ions improved with increasing concentration of the additive. The modified membranes showed a higher permeability for divalent ions than for monovalent ones [6].
The composition of the product obtained in this study was analyzed in an elementary way. This
method of analysis is intended for the qualitative and quantitative determination of the elemental composition of liquid, solid and gaseous substances and materials. The elemental composition of a substance must be known to control raw materials used in any production, production, as well as finished products.
In this study, polyvinyl chloride was dissolved in dimethyl sulfoxide and its reaction with diphenyl-amine was studied to modify it with complexing reactive compounds. Their composition and properties have been determined. The composition of the resulting product was investigated by IR spectral analysis.
These works show the urgency of the problem of obtaining new sorption materials based on polyvinyl chloride.
The aim of this study is to obtain a diphenyl-amine-modified polyvinyl chloride sorbent and to study its structure by IR spectroscopy and elemental analysis.
Experimental part
Modification of polyvinyl chloride with di-phenylamine
6.25 g (0.1 mol) of a solution of polyvinyl chloride and 80 ml of dimethyl sulfoxide were introduced into a three-necked flask equipped with a mechanical stirrer, and 16.9 ml (0.1 mol) of diphenylamine were added dropwise with heating and stirred at 80 °C. Then the temperature was raised to 100-110 °C. After stirring for another 2.5-3 hours at this temperature, a solid resinous mass was formed, which was transferred into porcelain dishes, dried in an oven at a temperature of 55-60 C for 4 hours. The dried polymer was ground into powder, and low molecular weight substances were washed with 5% aqueous potassium hydroxide solution, and then washed with distilled water until the pH value was close to neutral (phenolphthalein indicator). The washed sorbent, which is a gel-like substance of yellow-brown color, was dried in air. Was obtained 16.44 g of a sorbent with a moisture content of 16%. The reaction yield is 84%. The obtained sorption material partially swells in water, does not dissolve in organic solvents.
Research results and their discussion The interpretation of the spectra was carried out us-
Samples of the synthesized sorbents, pressed into ing the basic software that implements the automatic
a pellet with KBr, were investigated by IR spectros- measurement of spectra, has a means of graphical
copy using a SHIMADZU IR Fourier spectrometer display of spectra and their fragments and forms the
(Japan) (range 400-4000 cm resolution 4 cm work with the library of user spectra (Fig. 1).
Figure 1. IR spectrum of
In the IR spectrum of the obtained complexing sorbent, the vibration frequencies were observed in v (NH) 3410 cm-1, vs (HRC=CH2) 2972 CM-1, (CH2) 2908 cm-1, (CH2) + (CN) 1668 cm-1, Ss (N-CHj 1425 cm-1, vs (CH2) 1313 cm-1, v (C-Oh) 1244 cm-1, v (C-O) 10226 cm-1, v (POC) 956 cm-1 areas. And this proves the modification of polyvinyl chloride with diphenylamine.
the synthesized sorbent.
To confirm the chemical composition of the synthesized sorbent, an elemental analysis was carried out on the basis of the Center for Advanced Technologies of the Ministry of Innovative Development of the Republic of Uzbekistan, the results of which are presented in (Table 1).
Table 1. Results of elemental analysis of the synthesized sorbent (sorbent weight - 60 mg)
Chemical elements in the sorbent Estimated Found
mg % mg %
Nitrogen 4.3 7.2 4.1 6.83
Carbon 48.46 80.7 48.65 81.08
Hydrogen 4.02 6.7 3.82 6.37
Chlorine 3.22 5.4 3.43 5.72
As follows from the table, the polyvinyl chlo- structure of modified polyvinyl chloride with diphe-ride matrix was modified with diphenylamine and nylamine can be summarized as follows: a complexing sorbent was obtained. The proposed
-C
Cl
y
Conclusion out. The chemical composition and the proposed
As a result of the studies carried out, a technique structure of the sorbent were established using the
for obtaining a sorption material by modifying poly- methods of elemental analysis and FTIR spectros-
vinyl chloride with diphenylamine has been worked copy.
References:
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2. Inamuddin TauseefAhmad Rangreez, and Abdullah M. Asiri. Applications of Ion Exchange Materials in Chemical and Food Industries, Springer Nature Switzerland AG, 2019. - P. 11-258.
3. BekchanovD. J., Sagdiev N.J. and Mukhamediev M. G., Am. J. Polym. Sci., 2016. - No. 6(2). - P. 46-49. URL: https://doi.org/10.59237j.ajps.20160602.03
4. Полянский Н. Г., Горбунов Г. В., Полянская Н. Л. Методы исследования ионитов. - М.: Химия, 1976. - 286 с.
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6. Preparation and characterization of ion-selective polyvinyl chloride based heterogeneous cation exchange membrane modified by magnetic iron-nickel oxide nanoparticles / S. M. Hosseini, S. S. Madaeni, A. R. Heidari, A. Amirimehr // Desalination.2012.- Vol. 284.- P. 191-199.
