Synthesis and Thermoreversible Gelation Properties of Main-Chain Poly(pyridine-2,6-dicarboxamide-triazole)s
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摘要A series of main-chain poly(amide-triazole)s were prepared by copper(I)-catalyzed alkyneazide AABB-type copolymerizatons between five structurally similar diacetylenes 15 with the same diazide 6. The acetylene units in monomers 15 possessed different degrees of conformational flexibility due to the different number of intramolecular hydrogen bonds built inside the monomer architecture. Our study showed that the conformational freedom of the monomer had a profound effect on the polymerization efficiency and the thermoreversible gelation properties of the resulting copolymers. Among all five diacetylene monomers, only the one, that is, 1-Py(NH)2 which possesses the pyridine-2,6-dicarboxamide unit with two built-in intramolecular H bonds could produce the corresponding poly(amide-triazole) Poly-(PyNH)2 with a significantly higher degree of polymerization (DP) than other monomers with a lesser number of intramolecular H bonds. In addition, it was found that only this polymer exhibited excellent thermoreversible gelation ability in aromatic solvents. A self-assembling model of the organogelating polymer Poly-(PyNH)2 was proposed based on FTIR spectroscopy, XRD, and SEM analyses, in which H bonding, aromatic stacking, hydrophobic interactions, and the structural rigidity of the polymer backbone were identified as the main driving forces for the polymer self-assembly process.
著者Yim SL, Chow HF, Chan MC, Che CM, Low KH
期刊名稱Chemistry - A European Journal
出版年份2013
月份2
日期1
卷號19
期次7
出版社WILEY-V C H VERLAG GMBH
頁次2478 - 2486
國際標準期刊號0947-6539
電子國際標準期刊號1521-3765
語言英式英語
關鍵詞catalysis; click chemistry; copper; polymers; supramolecular chemistry
Web of Science 學科類別Chemistry; Chemistry, Multidisciplinary; CHEMISTRY, MULTIDISCIPLINARY

上次更新時間 2020-31-10 於 00:16