Silicon-Based Interpenetrating Polymer Networks (IPNs):  Synthesis and Properties

Abstract

Both “condensation” and “hydrosilylation” reactions have been successfully applied for the synthesis of silicon-based interpenetrating polymer networks (IPNs) consisting of a stable Si−O and Si−C linkage. We adopted a ladder silsesquioxane oligomer (LDS 1; commercial name, Glass Resin GR100) and a polycarbosilane (PCS) by hydrosilylation polymerization of bifunctional Si−H and Si−vinyl monomers as the two components for the IPN. The combined LDS/PCS curing system was studied to try to obtain homogeneously cured material, which may lead to IPN formation, by using both reactions selectively in one pot for chain-extending and cross-linking of both components, respectively. We synthesized the cured LDS/PCS; LDS/PCS = 8/2, 5/5, and 2/8 [wt/wt]. Tuning the rates of the two reactions to each other was important for obtaining a transparent cured product. The morphology of the cured LDS/PCS (8/2) was examined by TEM and AFM. TEM analysis showed a good miscibility with an nm level of LDS/PCS (8/2). The thermal and mechanical properties of the LDS/PCS (8/2) cured sample were better than the calculated values from each component's value. The experimental data imply the IPN structure of the cured LDS/PCS.

Tailored Synthesis and Fundamental Characterization of Organic‐Inorganic Hybrid Gels by Means of a Hydrosilylation Reaction

“…Some organic-inorganic hybrid polymers with network structures have been developed by means of the hydrosilylation reaction of multi-functionalized crosslinking reagents containing Si-H or vinyl groups. [14][15][16][17][18][19][20][21][22][23][24] These network polymers have characteristic properties: high transparency, high thermal stability, good mechanical strength, excellent solvent resistance, low dielectric constants. In this context, the precise control of structures and the fundamental characterization of the organic-inorganic hybrid network is essential, not only to improve these properties but also to develop novel network polymers with specific features.…”

Silicon‐based materials prepared by IPN formation and their properties

“…In our previous work, the solid-state NMR analysis suggested that the two components (LDS and PCS) independently formed the networks. 9 Now we are analyzing the structure of our Si-based IPN.…”

“…3Ϫ8 In a previous article, the authors reported the synthesis of silicon-based interpenetrating polymer networks (IPNs) consisting of a stable Si-O and/or a Si-C linkage. 9 "Condensation" and "hydrosilylation" reactions were applied to the synthesis of silicon-based IPNs. Ladder silsesquioxane oligomer (LDS 1, commercial name: Glass Resin™ GR100) and a polycarbosilane (PCS) were used as the components of the Sibased IPN (Table I) (2) The casting method was used to prepare the Sibased IPN.…”

Synthesis and Structure of Organic-Inorganic Hybrid Semi-interpenetrating Polymer Network Gels

“…The organic-inorganic hybrid polymers have been prepared by some effective methods (Mark et al, 1995;Mascia, 1995;Novak, 1993;Provatas et al, 1997;Laine et al, 1998;Vaia et al, 1996;Sogah et al, 1999;Saegusa et al, 1991;Landry st al., 1993;Yamada et al, 1997;Chujo et al, 2003;Laine et al, 2003;Galiastsatos et al, 2001). Hydrosilylation reaction of multi-functionalized crosslinking reagents containing Si-H or vinyl group is one of the effective methods to yield the organic-inorganic network polymers containing Si (Yoshida et al, 2004(Yoshida et al, , 2001Tsumura et al, 1998Tsumura et al, , 1999Michalczyk et al, 1993;Lercher et al, 2002;Laine et al, 1998;Schaefer et al, 2003). The authors recently attained effective synthesis of organic-inorganic hybrid gels by means of a hydrosilylation reaction of cyclic siloxane or cubic silsesquioxane with ,-nonconjugated dienes.…”