Synthesis and characterization of anionic amphiphilic model conetworks of 2-butyl-1-octyl-methacrylate and methacrylic acid:: Effects of polymer composition and architecture

被引:74
作者
Kali, Gergely
Georgiou, Theoni K.
Ivan, Bela
Patrickios, Costas S.
Loizou, Elena
Thomann, Y.
Tiller, Joerg C.
机构
[1] Univ Cyprus, Dept Chem, CY-1678 Nicosia, Cyprus
[2] Hungarian Acad Sci, Inst Mat & Environm Chem, Chem Res Ctr, Dept Polymer Chem & Mat Sci, H-1525 Budapest, Hungary
[3] Louisiana State Univ, Dept Chem, Baton Rouge, LA 70803 USA
[4] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[5] Univ Freiburg, Inst Macromol Chem, Ctr Mat Res, Dept Chem, D-79104 Freiburg, Germany
关键词
D O I
10.1021/la7012478
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Seven amphiphilic conetworks of methacrylic acid (MAA) and a new hydrophobic monomer, 2-butyl-l-octyl-methacrylate (BOMA), were synthesized using group transfer polymerization. The MAA units were introduced via the polymerization of tetrahydropyranyl methacrylate (THPMA) followed by the removal of the protecting tetrahydropyranyl group by acid hydrolysis after network formation. Both THPMA and BOMA were in-house synthesized. Ethylene glycol dimethacrylate (EGDMA) was used as the cross-linker. Six of the conetworks were model conetworks, containing copolymer chains between cross-links of precise molecular weight and composition. The prepared conetwork series covered a wide range of compositions and architectures. In particular, the MAA content was varied from 67 to 94 mol %, and three different conetwork architectures were constructed: ABA triblock copolymer-based, statistical copolymer-based, and randomly cross-linked. The linear conetwork precursors were analyzed by gel permeation chromatography and H-1 NMR spectroscopy in terms of their molecular weight and composition, both of which were found to be close to the theoretically calculated values. The degrees of swelling (DS) of all the amphiphilic conetworks were measured in water and in THY over the whole range of ionization of the MAA units. The DSs in water increased with the degree of ionization (DI) and the content of the hydrophilic MAA units in the cometwork, while the DSs in THF increased with the degree of polymerization of the chains between the cross-links and by reducing the DI of the MAA units. Finally, the nanophase behavior of the conetworks was probed using small-angle neutron scattering and atomic force microscopy.
引用
收藏
页码:10746 / 10755
页数:10
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