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- W2100044737 abstract "A variety of silicone fluids have been found to gel using low concentrations (typically < 4 wt.%) of 1,3:2,4-dibenzylidene sorbitol (DBS). DBS is known to be a chiral gelator for many organic solvents. Gels were formed when small amounts of DBS were introduced into the silicone fluids either by heating to high temperatures or at ambient temperatures with the use of a co-solvent. Optical and electron microscopy of neat silicon–DBS gels (concentration as low as 0.005 wt.%), revealed the formation of two types of fibrous network. One consisted of ribbon-like macrofibres (average width, ca. 2–3 µm) present in the opaque region of the gels and the other consisted of dense intertwined microfibres (average width, ca. 100 nm) present in the clear portion of the gels. The gels prepared in the presence of a co-solvent consisted only of the microfibrous network. N-Methylpyrrolidone was found to be a very effective co-solvent for the phenyl-containing siloxanes producing firm clear gels. Dynamic mechanical measurements indicated that the storage modulus (G′) of these gels increased with increasing DBS content over the range 1–6 wt.% DBS. Comparison with propylene glycol–DBS gels showed the silicone gels to differ in that they comprised mostly an isotropic phase with no detectable crystalline phase present." @default.
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- W2100044737 date "1995-01-01" @default.
- W2100044737 modified "2023-10-18" @default.
- W2100044737 title "Gelation of silicone fluids using 1,3:2,4-dibenzylidene sorbitol" @default.
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- W2100044737 doi "https://doi.org/10.1039/jm9950501899" @default.
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