TY - JOUR
T1 - Comparison of new periodic, mesoporous, hexylene-bridged polysilsesquioxanes with Pm3n symmetry versus sol-gel polymerized, hexylene-bridged gels
AU - Lin, Derong
AU - Hu, Lijiang
AU - You, Hong
AU - Tolbert, Stephanie H.
AU - Loy, Douglas A.
N1 - Funding Information:
Gratitude to Phil Anderson at the University of Arizona Research Laboratories for transmission electron microscopy and Dr. Zhe Li at the Department of Chemistry at the University of Arizona for his assistance with the scanning electron microscopy. We would like to thank Dr. Lv Kai at the Department of Chemistry at the University of Massachusetts for the SXRD data and help with its interpretation. Financial supports are acknowledged from The Aerospace Supported Fund (GN: 2012-HT-HGD-11 ) and from The Invitation of Foreign Experts Program of The Chinese Foreign Experts Bureau (GN: GDW20122300078 ), China.
Publisher Copyright:
© 2014 Published by Elsevier B.V.
PY - 2014/12/15
Y1 - 2014/12/15
N2 - Hexylene-bridged polysilsesquioxanes were synthesized from 1,6-bis(triethoxysilyl)hexane (BESH) by acid- and base-catalyzed, sol-gel polymerizations and surfactant templating in order to compare, for the first time for any bridged polysilsesquioxane, the structures and porosities created by the different methods of preparation. Surfactant templating with Brij 56 under acidic conditions and N-(3-trimethyl-ammoniumpropyl)hexadecylammonium dibromide under basic conditions gave rise to the first periodic mesoporous hexylene-bridged polysilsesquioxanes ever reported. Both exhibited cubic Pm3n mesostructures with narrow pore size distributions (2.2 and 3.82 nm, respectively) and the highest surface areas ever reported for hexylene-bridged polysilsesquioxanes. Hexylene-bridged polysilsesquioxanes prepared under acidic, sol-gel conditions became non-porous during drying, but base-catalyzed sol-gel polymerizations of BESH afforded high surface area xerogels with pore size distributions comparable to periodic mesoporous organosilicas.
AB - Hexylene-bridged polysilsesquioxanes were synthesized from 1,6-bis(triethoxysilyl)hexane (BESH) by acid- and base-catalyzed, sol-gel polymerizations and surfactant templating in order to compare, for the first time for any bridged polysilsesquioxane, the structures and porosities created by the different methods of preparation. Surfactant templating with Brij 56 under acidic conditions and N-(3-trimethyl-ammoniumpropyl)hexadecylammonium dibromide under basic conditions gave rise to the first periodic mesoporous hexylene-bridged polysilsesquioxanes ever reported. Both exhibited cubic Pm3n mesostructures with narrow pore size distributions (2.2 and 3.82 nm, respectively) and the highest surface areas ever reported for hexylene-bridged polysilsesquioxanes. Hexylene-bridged polysilsesquioxanes prepared under acidic, sol-gel conditions became non-porous during drying, but base-catalyzed sol-gel polymerizations of BESH afforded high surface area xerogels with pore size distributions comparable to periodic mesoporous organosilicas.
KW - Hexylene bridged polysilsesquioxanes
KW - Mesoporous cubic phase
KW - Sol-gel polymerized
KW - Surfactant templated
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U2 - 10.1016/j.jnoncrysol.2014.09.045
DO - 10.1016/j.jnoncrysol.2014.09.045
M3 - Article
AN - SCOPUS:84908393385
VL - 406
SP - 139
EP - 143
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
SN - 0022-3093
ER -