Finely divided methylsilsesquioxane particles with SiO4/2 fragments in structure

• Published in: Modern electronic materials 2016-03, Vol.2 (1), p.18-22
• Main Authors: Averichkin, Pavel A., Andrusov, Yuri B., Denisov, Igor A., Klychbaev, Tursunbek B., Parkhomenko, Yuri N., Smirnova, Natalia A.
• Format: Article
• Language: English
• Subjects: Crystalline nanoparticles; Electron scanning microscopy; Hydrolysis; Laser correlation spectroscopy; Methylsilsesquioxanes; Silicon-organic compounds; Siloxane particles; Suspension
• ISSN: 2452-1779; 2452-1779
• DOI: 10.1016/j.moem.2016.08.002

Results of structural and morphological investigations of methylsilsesquioxane finely divided particles synthesized by hydrolytic co-condensation of in situ alkoxylated methyltrichlorosilane and tetrachlorous silicon are presented. The silica-type hydrophobe particles have been obtained using the abovementioned method with an output of 98.7–99.4wt% of the load. These particles have been identified as crystalline formations with a lattice period of 5.5–8.0nm and an interplane distance of 0.92–1.04nm in the near order. We show that unlike for well-known crystalline methylsilsesquioxanes, introduction of chemically bonded SiO4/2 fragments to the material structure leads to the formation of 2–3μm-sized spherical particles from the initial 10–15nm particles; these particles are responsible for the spherical morphology of the surface. A method of extracting siloxane nanoparticles (2.5–280nm) from the reaction products has been described, the behavior of particles in suspension has been studied and particle dimensional parameters have been determined using helium−neon 0.6328nm laser correlation spectroscopy.