[01] Khoroshavina J. V., Laboratory Silicone Rubber, Institute of Synthetic Rubber (FSUE ISR), Saint-Petersburg, Russia. [02] Frantsuzova J. V., Laboratory Silicone Rubber, Institute of Synthetic Rubber (FSUE ISR), Saint-Petersburg, Russia. [03] Nikolaev G. A., Laboratory Silicone Rubber, Institute of Synthetic Rubber (FSUE ISR), Saint-Petersburg, Russia.

The aim of this work was to obtain the siloxane-polyphenylsilsesquioxane block copolymer and its vulcanizate by standard methods.Polyphenylsilsesquioxane-polydimethylsiloxane block copolymer was obtained by hydrolytic polycondensation of polydimethylsiloxane with phenyltrichlorosilane, followed by condensation of the hydrolyzate. It represents a material with uniform distribution of the silicon organic and inorganic phases at the molecular level, filled by non-condensed polyphenylsilsesquioxanes. A high temperature resistance of new block copolymer was shown by thermogravimetric analysis. The experimental test on mechanical properties such as tensile strength, elongation at break, hardness and compression set carried out on the vulcanizates of new rubber produced showed an increase in the tensile strength, elongation, hardness and heat resistance.

"Polyphenylsilsesquioxane-Polydimethylsiloxane Block Copolymer, Hydrolytic Polycondensation, Filled Vulcanizate, Heat Resistance "

[01] Ichiro Imae, Shotaro Takayama, Daisuke Tokita, Yousuke Ooyama, Kenji Komaguchi, Joji Ohshita, Yutaka Harima “Synthesis of a Novel Family of Polysilsesquioxanes Having Oligothiophenes with Well-Defined Structures”, International Journal of Polymer Science V. 2012, Article ID 484523, 10 page. [02] H. Endo, N. Takeda, M. Unno “Synthesis and Properties of Phenylsilsesquioxanes with Ladder and Double-Decker Structures”, Organometallics, 33 (15), 4148–4151. [03] G. Kickelbick “Silsesquioxanes”, Functional Molecular Silicon Compounds I, 155, 1-28 (2013). [04] R. Duchateau “Incompletely Condensed Silsesquioxanes: Versatile Tools in Developing Silica-Supported Olefin Polymerization Catalysts”, Chem. Rev., 102. 3525. [05] H. Baney, M. Itoh, A. Sakakibara, T. Suzuki “Silsesquioxanes”, Chem. Rev., 95, 1409. [06] D. Chen, Y. Liu, C. Huang “Synergetic effect between POSS and fumed silica on thermal stabilities and mechanical properties”, Polymer degradation and stability, 97, 308. [07] D. Gnanasekaran, K. Madhavan, B.S. Reddy “Developments of polyhedral oligomeric silsequioxanes (POSS), POSS nanocomposites and their applications”, J. Scientific & Industrial Research, 68, 437. [08] K. Pielichowski, J. Njuguna, B. Janowski, J. Pielichowski “Polyhedral oligomeric silsequioxanes (POSS)-containing nanohybrid polymers”, Adv. Polym. Sci., 225, 201 (2006). [09] A. Lou Douglas and J.S. Kennet, “Bridged polysilsesquioxanes. Highly Porous hybrid organic-inorganic materials”, Chem. Rev., 95 (5), 1431. [10] M. Handke, B. Handke, A. Kowalewska, W. Jastrzebski New polysiloxane materials of ladder-like structure, J. Mol. Structure, 254 (2009). [11] X. Li, Y. Song, M. Zhu, B. Liu, and Z. Jiang, “Preparation and properties of the POSS-containing composites as proton exchange membranes,” Gaodeng Xuexiao Huaxue Xuebao, vol.32, № 8, pp. 1670–1672 (2011). [12] S. H. Pezzin, N. Stock, S. Shishatskiy, and S. P. Nunes, “Modification of proton conductive polymer membranes with phosphonated polysilsesquioxanes,” Journal of Membrane Science, vol. 325, № 2, pp. 559–569 (2008). [13] C. Chanthad, K. Xu, H. Huang, and Q. Wang, “Protonconductive polymer nanocomposite membranes prepared from telechelic fluorinated polymers containing perfluorosulfonic acid side chains,” Journal of Polymer Science, Part A, vol. 48, № 21, pp. 4800–4810 (2010). [14] B. J. Liu, X. F. Li, M. M. Guo, C. Liu, L. Li, and Z. H. Jiang, “Synthesis and hybrid of a(4-phosphonic acid) phenylated poly (aryleneether sulfone),” Gaodeng Xuexiao Huaxue Xuebao, vol. 31, № 6, pp. 1081–1083 (2010). [15] Pat. Russian Federation 2 142 478: MCI 08 C 77 G, C 08 F 283/12, C 08 G 77/06. [16] E.G. Ehrenburg, S.B. Dolgoplosk, L.M. Terentyeva Vysokomolekulyarnye soedineniya. Serie B., 33 (8), 586.