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

页码：6833 / 6840

页数：8

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