Thiirane functional spherosilicate as epoxy resin modifier

Abstract

Epoxy resin-based composites, also those containing POSS compounds, have been the subject of extensive research because of their attractive properties and broad practical applications. However, in some applications they suffer from too long curing times or not strong enough adhesion to metals. A solution to this problem is the use of episulfide (thiirane) derivatives or their combination with epoxies. In this paper, the synthesis of new octakis[(3-(thiiran-2-yloxy)propyl)dimethylsiloxy]octasilesquioxane from its 3-glycidoxypropyldimethylsiloxy analog is described. Results of study of its influence on thermal properties as well as curing processes of modified with this compound epoxy resins hardened with maleic, phthalic, and pyromellitic anhydrides are also presented. It is shown that addition of this new thiirane functional POSS compound can significantly increase thermal stability of obtained epoxy resin composites and decrease its curing temperatures.

Polyurethane composites based on silsesquioxane derivatives of different structures

“…Silsesquioxanes are widely used as components for the preparation of such materials [1][2][3][4][5][6][7][8][9][10]. Commonly reactive, functionalized polyhedral oligomeric silsesquioxanes of well-defined, 3D structure, bearing one or more functional groups were applied for this purpose [11][12][13][14][15][16].…”

Effect of Polyhedral Oligomeric Silsesquioxane on the Melting, Structure, and Mechanical Behavior of Polyoxymethylene

“…Comparing the average size of the macromolecular chains of these silsesquioxane molecule sizes, together with the possibility of implementation of the appropriate functional group, facilitates the deposition of POSS in the polymer matrix. Poly(methyl methacrylate) [10], polyethylene [11], polypropylene [12,13], poly(ethylene terephthalate) [14], polylactide [15], epoxide resins [16], polyurethanes [17], and polyoxymethylene [18,19] were all found to have an impact on certain physical properties such as glass transition, decomposition temperature, viscosity, fracture toughness, and barrier properties [20,21,22,23,24].…”

Alternating Copolymer of Double Four Ring Silicate and Dimethyl Silicone Monomer–PSS‐1

“…It occurs in 33 of the 232 listed zeolite framework types. [2][3][4][25][26][27][28] Advances in spherosilicate and POSS chemistry in recent years enabled the synthesis of sophisticatedD 4R-based polymer materials. In cyclosilicate (CyS) crystalst he charge of the D4R unit with formula [Si 8 O 12 ][O À ] n [OH] 8Àn is compensated by inorganic or organic cations.I nt he subgroup of cyclosilicate hydrates( CySH) the D4R units are engaged in ah ydrogen-bonded network involvingw ater molecules and amines.…”

“…[13,14] Thec ombination of ac hemically inert D4R silicate core with endlessly tunable functional groups renders these compounds highly useful as organic-inorganic hybrid materials. [2][3][4][25][26][27][28] Advances in spherosilicate and POSS chemistry in recent years enabled the synthesis of sophisticatedD 4R-based polymer materials. [2] They have been assembled in organolithic macromolecular materials, [29] dendrimers [8] and marshmallow-like mesoporous to macroporous gels.…”

“…These functional groups are siloxy groups (OSiR 3 ) in spherosilicates and hydrogen, alkyl or alkoxy groups in POSS . The combination of a chemically inert D4R silicate core with endlessly tunable functional groups renders these compounds highly useful as organic–inorganic hybrid materials . Advances in spherosilicate and POSS chemistry in recent years enabled the synthesis of sophisticated D4R‐based polymer materials .…”