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    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/93232

    題名: Tuning the self-assembled 1,3:2,4-di(3,4-dimethylbenzylidene) sorbitol nanoarchitectures using the phase inversion method
    作者: Lai, Wei-Chi;Tseng, Shen-Jhen
    貢獻者: 淡江大學化學工程與材料工程學系
    關鍵詞: Poly(vinylidene fluoride);Crystallization;Liquid–liquid demixing;Nanofibrils;Nanomats;Nanostructured membrane
    日期: 2013-10
    上傳時間: 2013-12-10 13:17:18 (UTC+8)
    出版者: Dordrecht: Springer Netherlands
    摘要: 1,3:2,4-Di(3,4-dimethylbenzylidene) sorbitol (DMDBS) molecules can self-assemble into nanoscaled structures in organic solvents and polymer melts. The nanofibril structures were the mostly found. In this study, we used two phase inversion methods, i.e., dry and wet methods, to obtain different DMDBS nanoarchitectures. Poly(vinylidene fluoride) (PVDF) was chosen as polymer matrix, and the DMDBS structures were tuned by the process of PVDF membrane formation (crystallization and liquid–liquid demixing). When the membrane was prepared using the dry method, the DMDBS structure is controlled by the PVDF crystallization. Fewer DMDBS nanofibrils formed on the surfaces, and no nanofibrils were found in the cross-sections. On the other hand, when the membrane was prepared using the wet method, the liquid–liquid demixing (nonsolvent induced phase separation) occurred simultaneously as PVDF crystallized, and thus influenced the aggregation of DMDBS molecules. DMDBS is an amphiphilic molecule with two hydrophilic hydroxyl groups. The addition of nonsolvent (water) caused a large number of DMDBS molecules to aggregate outside the hydrophobic PVDF. In addition, a new structure “nanomat” was found. The mat was composed of DMDBS nanofibrils with diameters of 10–20 nm, similar to those observed in the dry method membranes. Fourier transform infra-red spectroscopy indicates that the DMDBS molecules self-assembled (aggregated) mainly through intermolecular hydrogen bonding in the presence of PVDF. The more intermolecular hydrogen bonding between DMDBS existed, the more excessive amounts of DMDBS molecules were, leading to the formation of nanomats.
    關聯: Journal of Nanoparticle Research 15(11), 2060(10pages)
    DOI: 10.1007/s11051-013-2060-0
    顯示於類別:[化學工程與材料工程學系暨研究所] 期刊論文


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