| Summary: | 碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 101 === We study the organogels of structure, rheology and thermal Properties in two systems by 1,3:2,4 -Dibenzylidene sorbitol(DBS) and alcohol systems. One system is the difference between molecular weight and different end groups of alcohol solvents and another is the structure difference between DBS and its derivers.
By POM analysis, we found the spherulite-like structure and the 3-D network of DBS by TEM and SEM. We also found the DBS organogels aggregate as lamellar type by SAXS. By rheology and thermal Properties analysis, we found the long carbon chains of PEG make the OH end groups more influential ;the long carbon chains of PEG and the OH end groups made DBS cannot self-assemble easily result in weaker organogels and slower phase transition . By IR and UV analysis we found though small molecular weight solvents have more OH end groups, DBS still self-assemble easily in these solvents without long carbon chains barrier.
By rheology and thermal properties analysis, we found the alkyl groups steric resistance of DBS derivers keep the molecules away from PEG OH end groups then made organogelaters self-assemble and phase transition easily. By IR analysis we found though 1wt% DBS organogel has stronger hydrogen bond, the fibers of DBS were too weak to form gel. By UV analysis, we can simulate DBS phenyl rings stack as T-shape (point to face) and DMDBS stack as face to edge structure.
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