INFLUENCE OF AQUEOUS AND ALCOHOL ENVIRONMENT ON THE PROCESS OF SUSPENSION POLYMERIZATION OF METHYL METHACRYLATE
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Belgorod State Technological University named after V.G. Shukhov
2.
Belgorodskiy Gosudarstvennyy Tehnologicheskiy universitet imeni V.G. Shuhova
(Teoreticheskaya i prikladnaya himiya, aspirant)
graduate student from 01.01.2022 to 01.01.1926
Belgorod, Belgorod, Russian Federation
graduate student from 01.01.2022 to 01.01.1926
Belgorod, Belgorod, Russian Federation
3.
Belgorod State Technological University named after V.G.Shukhov
employee
Belgorod State Technological University named after V.G.Shukhov (Teoreticheskoy i prikladnoy himii, mladshiy nauchnyy sotrudnik)
employee
Belgorod State Technological University named after V.G.Shukhov
graduate student
Belgorod, Belgorod, Russian Federation
employee
Belgorod State Technological University named after V.G.Shukhov (Teoreticheskoy i prikladnoy himii, mladshiy nauchnyy sotrudnik)
employee
Belgorod State Technological University named after V.G.Shukhov
graduate student
Belgorod, Belgorod, Russian Federation
4.
Belgorodskiy Gosudarstvennyy Tehnologicheskiy Universitet im. V.G. Shuhova
Type:
Article
Pages:
from 46
to 50
Status:
In work
Language:
Russian
Keywords:
METHYL METHACRYLATE, SUSPENSION POLYMERIZATION, COLLOIDAL PARTICLES, MONOMER, INITIATOR, DISPERSIBILITY OF THE SYSTEM
Abstract (English):
In this work, the effect of the chemical properties of liquid media on the process of suspension polymerization of methyl methacrylate and the size of the resulting colloidal particles under the thermal effect of elevated temperatures and physical acceleration of the process are studied. The process of suspension polymerization based on methyl methacrylate is considered in an aqueous medium (H2O) and in an alcohol medium, namely, in ethyl alcohol (CH3CH2OH) under the same parameters: solution heating temperature, pressure, air humidity and ambient temperature in the laboratory. The results of measuring the dispersion of the formed colloidal particles during polymerization in each medium are presented. Every 10 min. a sample was taken from the solution for comparative analysis. The sizes of colloidal particles were determined using a Zetatrac particle size analyzer from Microtrac Inc. (Montgomeryville, Pennsylvania, USA). A comparative analysis of the monomer conversion rates in different media was carried out using the calculation method at different time intervals of the experiment. Particle size in the first 10 min. in an aqueous medium is 0.121 μm, which is 30 times larger than the size of a colloidal particle in an alcohol medium at the same time. According to the results of the study, the conversion process of methyl methacrylate monomer occurs according to three Harkinson periods, in an aqueous medium, the conversion efficiency is 8% higher than in a medium with ethyl alcohol. Also, in an aqueous medium, the rate of the process of colloidal particle formation is higher and the molecular weight of colloidal particles is higher at any time interval. The process of colloidal particle formation in an alcohol suspension occurs more smoothly. A sharp increase in molecular weight is observed after 3.5 hours from the beginning of the experiment.
In this work, the effect of the chemical properties of liquid media on the process of suspension polymerization of methyl methacrylate and the size of the resulting colloidal particles under the thermal effect of elevated temperatures and physical acceleration of the process are studied. The process of suspension polymerization based on methyl methacrylate is considered in an aqueous medium (H2O) and in an alcohol medium, namely, in ethyl alcohol (CH3CH2OH) under the same parameters: solution heating temperature, pressure, air humidity and ambient temperature in the laboratory. The results of measuring the dispersion of the formed colloidal particles during polymerization in each medium are presented. Every 10 min. a sample was taken from the solution for comparative analysis. The sizes of colloidal particles were determined using a Zetatrac particle size analyzer from Microtrac Inc. (Montgomeryville, Pennsylvania, USA). A comparative analysis of the monomer conversion rates in different media was carried out using the calculation method at different time intervals of the experiment. Particle size in the first 10 min. in an aqueous medium is 0.121 μm, which is 30 times larger than the size of a colloidal particle in an alcohol medium at the same time. According to the results of the study, the conversion process of methyl methacrylate monomer occurs according to three Harkinson periods, in an aqueous medium, the conversion efficiency is 8% higher than in a medium with ethyl alcohol. Also, in an aqueous medium, the rate of the process of colloidal particle formation is higher and the molecular weight of colloidal particles is higher at any time interval. The process of colloidal particle formation in an alcohol suspension occurs more smoothly. A sharp increase in molecular weight is observed after 3.5 hours from the beginning of the experiment.
Keywords:
METHYL METHACRYLATE, SUSPENSION POLYMERIZATION, COLLOIDAL PARTICLES, MONOMER, INITIATOR, DISPERSIBILITY OF THE SYSTEM
METHYL METHACRYLATE, SUSPENSION POLYMERIZATION, COLLOIDAL PARTICLES, MONOMER, INITIATOR, DISPERSIBILITY OF THE SYSTEM
