文献类型：期刊文献

英文题名：Telechelic Hybrid Poly(acrylic acid)s Containing Polyhedral Oligomeric Silsesquioxane (POSS) and Their Self-Assembly in Water

作者：Zhang, Weian[1];Yuan, Jiayin[2];Weiss, Stephan[2];Ye, Xiaodong[3,4];Li, Chunliang[3,4];Mueller, Axel H. E.[2]

机构：[1]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China;[2]Univ Bayreuth, D-95440 Bayreuth, Germany;[3]Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China;[4]Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Anhui, Peoples R China

年份：2011

卷号：44

期号：17

起止页码：6891

外文期刊名：MACROMOLECULES

收录：;EI(收录号：20113714319733);WOS:【SCI-EXPANDED(收录号:WOS:000294585600033)】；

基金：This work was supported by the National Natural Science Foundation of China (nos. 21074035 and 20804043). W.Z. also acknowledges support by the Alexander von Humboldt Foundation and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Scanning electron microscopy - Carboxylic acids - Light scattering - Solutions - Hydrocarbons - Self assembly - Copper compounds - High resolution transmission electron microscopy - Molecular weight - Sodium Azide

摘要：Telechelic ("dumbbell-shaped") POSS-containing inorganic/organic hybrid poly(tert-butyl acrylate) (POSS-PtBA-POSS) was prepared by the combination of ATRP and the copper-catalyzed azide-alkyne "click" reaction. Telechelic bromoterminated PtBAs with different molecular weights were. first prepared via ATRP using a dibromo-functionalized ATRP initiator; subsequently, the bromo groups were transformed to azido groups using sodium azide in DMF via nucleophilic substitution. The "click" coupling between azido-terminated PtBA and alkyne-functionalized POSS was successfully accomplished to afford telechelic POSS-PtBA-POSS, which is confirmed by NMR and GPC. The telechelic POSS-PtBA-POSS was then hydrolyzed to amphiphilic telechelic POSS-functional poly(acrylic acid) (POSS-PAA-POSS). The self-assembly behavior of POSS-PAA-POSS with three different molecular weights in aqueous solution at pH 8.5 was investigated by transmission electron microscopy, scanning electron microscopy, and light scattering (SLS, DLS). The results show that POSS-PAA(40)-POSS and POSS-PAA(82)-POSS can self-assemble in water into ellipsoidal aggregates with a moderately uniform size, whereas POSS-PAA(140)-POSS with a long PAA chain only self-assembles into aggregates with a broad size distribution. We discuss the formation of layered crystals of POSS within these aggregates.