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Effect of Moisture on Molecular Motions of Chitosan/Polycaprotactam Blends  

Liao Shen-Kun (Department of Fiber and Composite Materials, Feng Chia University, Taichung, Taiwan)
Hung Chi-Chih (Department of Fiber and Composite Materials, Feng Chia University, Taichung, Taiwan)
Lin Ming-Fung (Department of Business & Administration Management, Transworld Institute of Technology, Yunlin, Taiwan)
Publication Information
Polymer(Korea) / v.28, no.5, 2004 , pp. 433-443 More about this Journal
Abstract
The membranes of the blends of chitosan and polycaprolactarn (PA6) were prepared in formic acid. FT-IR data revealed that hydrogen bonding between amide and hydroxyl groups of chitosan and PA6, respectively, was formed. Thermogravimetric analysis demonstrated that the blend samples contain water. DMA results showed that the dissipation of water in the samples significantly reduced the storage modulus (E'). The mechanical loss tangent (tan $\delta$) data of the blend samples showed the $\beta$d loss peak around $0^{\circ}C$. The blend samples were completely dried in a vacuum and then exposed to high moisture to absorb water which would cause, so called, w-bridges between the molecules. The E' data of these regained samples increased abnormally and additional loss peak appeared on the shoulder of the peak around $50^{\circ}C$. Under dry condition, the samples with a blend ratio of 40/60 for chitosan/PA6 displayed a better miscibility between two components.
Keywords
blend; chitosan; polycaprolactam; hydrogen bond; miscibility;
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