Nitroxide-mediated polymerization of N-isopropylacrylamide:: Electrospray ionization mass spectrometry, matrix-assisted laser desorption ionization mass spectrometry, and multiple-angle laser light scattering studies on nitroxide-terminated poly-N-isopropylacrylamides

被引：78
|
作者：
Schulte, T
Siegenthaler, KO
Luftmann, H
Letzel, M
Studer, A
机构：
[1] Univ Munster, Inst Organ Chem, D-48149 Munster, Germany
[2] Univ Bielefeld, D-33501 Bielefeld, Germany
来源：
MACROMOLECULES | 2005年 / 38卷 / 16期
关键词：
D O I：
10.1021/ma050343n
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Nitroxide-mediated controlled living free radical polymerization of N-isopropylacrylamide using highly sterically hindered 2,2,6,6-tetraethylpiperidin-4-on-N-oxyI 1 is described. In addition, an improved synthesis for nitroxide 1 is presented. Poly-N-isopropylacrylamides (PNIPAMs) prepared are analyzed by multiple-angle laser light scattering. Moreover, the nitroxide-terminated PNIPAMs are characterized using electrospray ionization mass spectrometry, matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS), and Fourier transform ion cyclotron MALDI-MS. Careful MS analysis reveals that chain-end degradation of nitroxide-terminated PNIPAMs occurs during MALDI analysis. A mechanism for chain end degradation is presented.
引用
收藏
页码：6833 / 6840
页数：8
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