Morphological and Property Analyses of Carbon Nanotube/Poly (NIPAAm) Composite Films and Fibers
Date Issued
2012
Date
2012
Author(s)
Kao, Shih-Chieh
Abstract
In this research, multi-walled carbon nanotube/poly(N-isopropylacrylamide) (poly(NIPAAm)) composite films and fibers were prepared via spin coating and electrospinning, respectively. Because of the thermosensitivity of poly(NIPAAm), the electrical conductivity properties of the composites depend on temperature and humidity.
First, sulfuric acid and nitric acid were used to modify multi-walled carbon nanotube (MWCNT) in order to disperse MWCNT better within the matrix. Dimension Raman system and electron spectroscopy for chemical analysis system (ESCA) were used to analyze modified MWCNT for choosing appropriate reaction condition. The effects of molecular interactions on volume phase transition temperature were discussed by differential scanning calorimeter (DSC).
Second, the morphology of electrospun nanofibers with difference polymer concentration and electrospinning parameters were characterized by field-emission scanning electron microscope (SEM). It was found that MWCNTs were embedded in nanofibers and mostly aligned along the fiber axis observed by transmitting electron microscope (TEM). In addition, the thermal crosslinking of N-methylolacrylamide (NMA) segments provided the ability of confining the morphology of nanofibers, which prevented the composite from dissolving in water.
Finally, electrical properties of the composite films and fibers were measured at different temperatures and relative humidity. The relationship between surface electrical resistance and temperature in dynamic process was studied.
Subjects
multi-walled carbon nanotubes
N-isopropylacrylamide
electrospinning,nanofiber
stimuli-responsive
Type
thesis
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