The nature of the organic group is a key factor in the organization of the gel prepared by sol-gel polycondensation of (MeO)(3)Si-R-Si(OMe)(3) precursors. Whereas isotropic gels are formed with flexible alkyl R groups, anisotropic gels are formed with rigid aryl organic groups. [GRAPHICS]
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[1]
Boury B, 1999, ANGEW CHEM INT EDIT, V38, P3172, DOI 10.1002/(SICI)1521-3773(19991102)38:21<3172::AID-ANIE3172>3.0.CO