Nanocomposites by surface-initiated living cationic polymerization of 2-oxazolines on functionalized gold nanoparticles

被引:180
作者
Jordan, R [1 ]
West, N
Ulman, A
Chou, YM
Nuyken, O
机构
[1] Polytech Univ, Dept Chem Chem Engn & Mat Sci, Metrotech Ctr 6, Brooklyn, NY 11201 USA
[2] Tech Univ Munich, Lehrstuhl Makromol Stoffe, D-85747 Garching, Germany
[3] Tech Univ Munich, NSF, MRSEC Polymers Engineered Interfaces, D-85747 Garching, Germany
关键词
D O I
10.1021/ma001615j
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
End-functionalized 3D self-assembled monolayers (SAMs) on gold nanoparticles were used to initiate the living cationic ring-opening polymerization reaction directly on gold nanoparticle surfaces ("grafting-from technique"). In this manner, dense polymer brushes were prepared in a "one-pot multistep" reaction. ER FTIR spectroscopy confirms the successful polymerization reaction as well as the introduction of a terminal functional group. The resulting gold/polymer nanocomposite was very stable. The combination of a "grafting-from reaction" resulting in polymer "brush-type" shells of linear macromolecules and the introduction of a terminal mesogen by means of a quantitative termination reaction resulted in an amphiphilic core-shell material with a well-defined hydrophilic/lipophilic balance (HLB). Ex-situ kinetic studies of the polymerization of 2-phenyl-2-oxazoline using FTIR spectroscopy and MALDI TOF mass spectrometry resulted in a linear relationship between the reaction time and degree of polymerization of the grafted polymer. This as well as the successful end-functionalization by termination with secondary amines corroborates our view of a well-defined. living polymerization mechanism.
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页码:1606 / 1611
页数:6
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