In Situ Characterization of Thermo-Responsive Poly(N-Isopropylacrylamide) Films with Sum-Frequency Generation Spectroscopy

被引：16

作者：

Kurz, Volker ^{[1
]}

Grunze, Michael ^{[1
]}

Koelsch, Patrick ^{[1
]}

机构：

[1] Univ Heidelberg, Appl Phys Chem Dept, D-69120 Heidelberg, Germany

来源：

CHEMPHYSCHEM | 2010年 / 11卷 / 07期

关键词：

interfaces; lower critical solution temperature; polymers; sum-frequency-generation spectroscopy; switchable surfaces; THERMOSENSITIVE POLYMER NANOPATTERNS; N-ISOPROPYLACRYLAMIDE; INFRARED-SPECTROSCOPY; CHEMICAL LITHOGRAPHY; GRAFTING DENSITY; MOLECULAR-WEIGHT; SURFACE; AFM; FABRICATION; INTERFACES;

D O I：

10.1002/cphc.200900978

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The thermo-responsive behaviour of thiol modified poly(N-isopropylacrylamide) (pNIPAM) films immobilized on gold are probed by in Situ broadband sum-frequency generation (SFG) spectroscopy. The pNIPAM films were prepared by atom transfer radical polymerization (ATRP) using a nitro-biphenyl-thiol (NBT)-SAM on a polycrystalline gold surface as a:substrate. Additionally, Raman and infrared reflection absorption spectroscopy (IRRAS) are applied to spin-coated pNIPAM films. Molecular groups involved in the reorientation and disordering of the polymer chains-during the LCST (lower critical solution temperature) transition of pNIPAM are identified. The characteristic vibrations of the CH3 groups show a gradual reorientation of the isopropyl groups within the pNIPAM film and instantaneous reorientation of the outermost CH3 groups around 32 degrees C.

引用

页码：1425 / 1429

页数：5

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