Sol-gel synthesis of hybrid organic-inorganic materials. Hexylene- and phenylene-bridged polysiloxanes

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Chemistry of Materials

DOI:https://doi.org/10.1021/cm950067z· OSTI ID:285005

Loy, D A; Jamison, G M; Baugher, B M; Myers, S A; Assink, R A; Shea, K J ^[1]

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1. Sandia National Laboratories, Albuquerque, NM (United States)

New highly cross-linked polysiloxanes were prepared by sol-gel polymerization of 1,6-bis(diethoxymethylsilyl)hexane (1) and 1,4-bis(diethoxymethylsilyl)benzene (2). Hydrolysis and condensation of 1 and 2 under acidic and basic conditions with 4 equiv of water led to the rapid formation of hexylene- and phenylene-bridged polysiloxane gels. The dry gels (xerogels) were intractable, insoluble materials that were noticeably hydrophobic, exhibiting no swelling in organic solvents or water. Most of the xerogels were high surface area, mesoporous materials. Hexylene-bridged polysiloxanes prepared under acidic conditions were always nonporous regardless of whether they were processed to afford xerogels or supercritically dried as aerogels. Hexylene-bridged polysiloxanes prepared under basic conditions and all of the phenylene-bridged polysiloxanes were mesoporous with surface areas as high as 1025 m{sup 2}/g. 35 refs., 9 figs., 3 tabs.

• Research Organization: Sandia National Laboratory
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 285005
• Journal Information: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 3 Vol. 8; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL PREPARATION
CROSS-LINKING
POLYMERIZATION
POLYMERS
SILOXANES
SOL-GEL PROCESS