Atom Transfer Radical Polymerizations of Complexes Based on Ti and Zr Alkoxides Modified with -Keto Ester Ligands and
详细信息 查看全文
- 作者：Sorin Ivanovici ; Herwig Peterlik ; Claudia Feldgitscher ; Michael Puchberger ; Guido Kickelbick
- 刊名：Macromolecules
- 出版年：2008
- 出版时间：February 26, 2008
- 年：2008
- 卷：41
- 期：4
- 页码：1131 - 1139
- 全文大小：332K
- 年卷期：v.41,no.4(February 26, 2008)
- ISSN：1520-5835
文摘
Well-defined complexes of Ti and Zr alkoxides and G SRC="/images/gifchars/beta2.gif" BORDER=0 ALIGN="middle">-keto ester ligands carrying polymerizabledouble bonds were copolymerized with methyl methacrylate applying atom transfer radical polymerization. Thestructure and the morphology of the obtained hybrid polymers were investigated using NMR, FT-IR, and sizeexclusion chromatography. All methods revealed an incorporation of both comonomers in the polymer backbone.NMR and FT-IR analyses demonstrated that after polymerization the chemical linkage between the metal alkoxidesand the organic macromolecules was preserved. The alkoxide-containing macromolecules were used as precursorsin the formation of metal oxide-containing nanocomposites applying the sol-gel process. The decompositiontemperature of the final nanocomposites increased depending on the chemical composition of the materials. Small-angle X-ray scattering investigations revealed a short-range order for the polymers containing Ti-alkoxides whichdisappeared after carrying out the sol-gel process due to the hydrolysis of the well-defined complexes. Transmissionelectron microscopy showed the formation of amorphous metal oxide nanoparticles inside the polymer networkwith diameters of a few nanometers. The particles were highly dispersed due to the low mobility of the alkoxidesin the matrix during the sol-gel process.