Synthesis and photoinitiated cationic polymerization of monomers with the silsesquioxane core

Abstract

A synthetic scheme was developed to prepare cationically polymerizable octafunctional monomers with silsesquioxane (TJ cores. Epoxy and 1-propenoxy functional groups were attached to the core by the hydrosilation of T~with an appropriate precursor. The steric constraintsand the requirementsfor the hydrosilationreaction are discussed.The monomers were fully characterized and then polymerized by exposure to ultraviolet irradiation in the presence of onium salt photoinitiators. The polymerization conditions for the monomers were optimized and compared with each other using real-time infrared spectroscopy. Thermal analysis was also performed on the resulting crosdinked polymers.

Preparation and properties of bismaleimide resins modified with hydrogen silsesquioxane and dipropargyl ether and their composites

“…POSS with one or more covalently bonded reactive groups is suitable for polymerization, grafting, surface bonding, blending and other transformations to build organic/inorganic hybrid materials at the molecular level. [9][10][11][12][13] POSS functionalized with groups such as hydrogen, 14 amine, 15 vinyl, 16 epoxy 17 and isocyanate 18 can be used as monomers or comonomers in typical polymerizations. One such POSS, hydrogen silsesquioxane (HSQ), has attracted increasing interest in scientific research and technological innovation.…”

Power and Thermal Technology for Air and Space. Delivery Order 0006: Nano-filled Polymers for Electrical Insulation

“…Silsesquioxanes are a class of compounds well known for their high temperature stability [4]. Recently a series of Polyhedral Oligomeric Silsesquioxanes (POSS) has been developed [15], all of which involve a robust silicon-oxygen cage framework with dimension of about 1-3 nm.…”

“…Researchers have synthesized a wide variety of POSS nanoparticle structures and investigated their incorporation into several thermoset and thermoplastic polymer matrices [1][2][3][4][5][6][7][8][9][10][11]. The surface of the POSS structure is often modified with reactive or otherwise "functional" groups to foster improved compatibility and/or covalent bonding with the host matrix.…”

Selective Vinyl Functionalization of Octakis(dimethylsiloxy)octasilsesquioxane with Allylbenzene and 1,5-Hexadiene and Copolymerization of the Products with Bis(dimethylsilyl)benzene

“…It has nanometer-size cubic structure with wide surface area and controlled porosity, and can be functionalized with a wide variety of organic groups as monomer in a typical polymerization. Use of POSS derivatives as monomer has been demonstrated to be an efficient method in the design of nanocomposite materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] as well as in designing various hybrid polymers with POSS as side groups [16][17][18][19][20][21][22][23][24][25][26][27][28] or as chain end, [29][30][31] which exhibit desirable unique properties. Laine et al reported the synthesis of multi-functinal POSS as precursors of nanocomposite materials from commercially available typical silane-functionalized cubic silsesquioxane, octakis(dimethylsiloxy)octasilsesquioxane (Q 8 M 8 H ) by hydrosilylation.…”