Study on hydration of poly(-vinylcaprolactam) microgels by near-IR and mid-IR spectroscopy

被引：14

作者：

Liu, Tao ^{[2
]}

Chen, Jianhong ^{[2
]}

Sugihara, Shinji ^{[1
]}

Maeda, Yasushi ^{[1
]}

机构：

[1] Univ Fukui, Dept Appl Chem & Biotechnol, Fukui 9108507, Japan

[2] Xian Univ Technol, Fac Mech & Precis Instrument Engn, Xian 710048, Peoples R China

来源：

COLLOID AND POLYMER SCIENCE | 2012年 / 290卷 / 08期

关键词：

Thermosensitive microgel; Hydration; IR; NIR spectroscopy; NETWORK STRUCTURE; PHASE-SEPARATION; POLY(N-VINYLCAPROLACTAM); POLY(N-ISOPROPYLACRYLAMIDE); TRANSITION; BEHAVIOR; WATER;

D O I：

10.1007/s00396-012-2621-2

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：

Hydration of poly(-vinylcaprolactam) microgels was investigated by near-infrared (NIR) and mid-infrared (MIR) spectroscopy. The thermosensitive microgels were prepared by emulsion polymerization, and turbidity, dynamic light scattering, and differential scanning calorimetry measurements were carried out. In MIR spectra, carbonyl bands consist of three components due to double, single, and zero hydrogen-bonding carbonyl groups as verified by density functional theory calculations. The relative intensities changed critically at the volume phase transition temperature upon heating. In NIR spectra, two absorbance peaks around 5,900 cm(-1) were observed, which can be assigned to the first overtone of C-H bands. Both of them undergo red shifts during the phase transition in a similar way to that of fundamental bands in MIR spectra. The result suggests that NIR spectroscopy may be a new general method that can provide new information for research on hydration of thermosensitive microgels.

引用

页码：763 / 767

页数：5

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