Abstract
The elongation of the oligodimethylsiloxane chain in a wide range of values (from 10 to 136 units) and, correspondingly, an increase in the concentration of carboxyl groups (from 2 to 22) in the composition of organosilicon surfactants with a comb-like structure significantly affects the surface activity and interfacial layer thickness, which increase from 3.7 to 15.7 mN m2 mol−1 and from 2 to 13 nm, respectively. The polymer suspensions obtained in the presence of the studied organosilicon surfactants (polymethyl methacrylate) are characterized by a narrow particle size distribution. The average particle diameter depends slightly on the oligodimethylsiloxane chain length and concentration of carboxyl groups in the surfactant molecules but changes significantly from 0.4 to 1.7 µm with an increase in the monomer concentration in the starting system from 10 to 20 wt.%. The resulting polymer microspheres are characterized by a hydrophilic surface due to a high content of carboxyl groups on the surface.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 796–803, April, 2022.
This work was financially supported in part by the Russian Foundation for Basic Research (Project No. 19-33-60053) and in the framework of the Ministry of Education and Science of the Russian Federation (Agreement No. 075-15-2020-794).
No human or animal subjects were used in this research.
The authors declare no competing interests.
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Gritskova, I.A., Artamonova, N., Lakhtin, V.G. et al. Effect of the oligodimethylsiloxane chain length and concentration of carboxyl groups on the colloidal chemical properties and characteristics of polymethyl methacrylate suspensions. Russ Chem Bull 71, 796–803 (2022). https://doi.org/10.1007/s11172-022-3480-8
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DOI: https://doi.org/10.1007/s11172-022-3480-8