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 (T8) cores. Epoxy and 1‐propenoxy functional groups were attached to the core by the hydrosilation of T H8 with an appropriate precursor. The steric constraints and the requirements for the hydrosilation reaction 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 crosslinked polymers. © 1997 John Wiley & Sons, Inc.

Thermal and Lithographic Performance of Silsesquioxane with Cycloaliphatic Epoxy‐Siloxane Hybrid Spacer for Soft Lithography

“…Of note is that thermal degradation improved at higher spacer chain length in terms of onset degradation temperature as well as the residual ceramic yield. The thermal degradation found here display almost similar behavior as found from the work of Crivello and Malik whose 5% degradation occurring at about 290 °C. The degradation range at 480–550 °C is attributable to siloxane linear structure which undergoes depolymerisation and decomposition in the form of cyclic oligomers .…”

“…This peak was absent in SiH‐1. The effect of steric hindrance of the bulky cycloaliphatic epoxy ring to the incorporation into the silsesquioxane structure seems insignificant due to the less congested linear chain polysiloxane spacer . Viscosities of EPSQ‐1, EPSQ‐2, and EPSQ‐3 were determined as 5.5, 6.4, and 9.2 Pa s −1 suggesting that the increase in spacer chain length enhance the viscosity.…”

Epoxy silsesquioxane resists for UV nanoimprint lithography

“…3 Silsesquioxane cages bearing eight dimethylsilyloxy groups can be functionalized by a hydrosilylation reaction carried out on the Si-H functions. 3 Silsesquioxane cages bearing eight dimethylsilyloxy groups can be functionalized by a hydrosilylation reaction carried out on the Si-H functions.…”

Network structures of polyhedral oligomeric silsesquioxane based nanocomposites: A Monte Carlo study

“…[7][8][9][10][11][12][13][14][15] The general formula of POSS is ͓RSiO 3/2 ͔ n consisted of a central core around 0.53 nm with organic groups R on the corner, in which octahedral (nϭ8) is the mostly studied member of this family. [7][8][9][10][11][12][13][14][15] The general formula of POSS is ͓RSiO 3/2 ͔ n consisted of a central core around 0.53 nm with organic groups R on the corner, in which octahedral (nϭ8) is the mostly studied member of this family.…”