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The Preparation of Multifunctional Textile Based on Polyaniline

Author: JinJunPing
Tutor: LiZuo
School: Beijing Institute of Clothing Technology
Course: Materials Science Polymer
Keywords: Polyaniline Conductive fabric Superhydrophobic Electrochromic Electromagnetic shielding
CLC: TB34
Type: Master's thesis
Year: 2010
Downloads: 167
Quote: 2
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Abstract

In the field of functional materials, conductive polymer by a simple chemical doping / dedoping can to achieve conductivity insulator - semiconductor - metal state wide range (10-9 ~ 105S/cm) reversible shift hence is a controllable conductance of an ideal gradient material. The conductive polyaniline has unique structural diversity, doping mechanism, environmental stability and many other excellent physical and chemical properties, and there are broad prospects for application in technology. In the synthesis process, by selecting the dopant having a specific function, can be given to the polyaniline such as special micro / nano-structure, super-hydrophobic, electroluminescent discoloration, as well as electrical, magnetic characteristics of a variety of excellent performance. If the polyaniline and the composite fabric, may be polyaniline these excellent properties is introduced into the fabric and thus is expected to have an antistatic, self-cleaning, the versatility of the fabric electrical the photochromic and electromagnetic shielding performance, these studies important scientific significance and application value. This thesis is based on the fabric as a base, using the in situ polymerization and coating the legal system prepared several different functions polyaniline conductive fabric. The specific contents are as follows: as a dopant. Trifluoroacetic acid (TFA), cotton cloth as a base, in situ polymerization the composite conductive polyaniline / cotton fabric (PANI / CCT), and its Structural characterization and performance tests. The results show that: the prepared PANI / CCT and the contact angle of water can be as high as 160.5 °, and is an ideal self-cleaning fabric; and which can respond quickly to changes in external acidity, to achieve a super-hydrophobic super-hydrophilic reversible changes. 2. Perfluoro nonene oxy benzene sulfonate (OBS) as a dopant, ferric chloride as an oxidant, to the surface of the self-developed with a large number of cracks and the cross-section of Cruciform Shaped fibers and polyester-cotton blend fabric as base, by in situ polymerization, prepared superhydrophobic properties of polyaniline / polyester composite conductive fabrics (PANI / CPCCT), water contact angle up to 162 °. Meanwhile, the resulting PANT / CPCCT at different pH values ??the contact angle and the surface resistance of the test results show that with the increase in pH, the fabric surface resistivity showed an increasing trend, and the water contact angle gradually decreased. When the pH is increased from 1 to 11 pm, a surface resistance of PANI / CPCCT maintained at 104? / Cm2 ~~ 107? / Cm2 range, still has a certain conductivity and good hydrophobicity (120 ° LT; CA LT; 165 °); at a pH GT; 12 was non-conductive state, the contact angle is also reduced to 0 °, resulting PANI / CPCCT conductivity and wettability with certain alkali resistance; but its color with the pH increase polyaniline doped degrees different from the dark green - blue and green - dark blue - brown reversible change. In addition, the resulting fabric occurs in the external acidity induced doping / dedoping reaction resulting by the conductive state transition to the insulating state, in order to achieve ultra hydrophobic super-hydrophilic reversible, rapid changes. In addition, cyclic voltammetry experimental results show the PANI / CPCCT blue-green occurred within the range of 0.4V-1.6V (1.03V) reversibly changes between the dark green (1.38V), has a certain electrical photochromic properties. Washed in a pH = 5 aqueous HCl and was found that the magnetic stirring after 15 days of continuous washing, its surface resistance is still maintained at 105? / Cm2, washable, and used several times after PANI / CPCCT by pH = after soaking in a HCl solution, and its performance can be restored. These excellent performance, it is expected to further development acidity control invasive switch self-clean fabric, acidity detection applications .3 polyaniline emulsion, copper powder and PVA composite coating method polyaniline / Cu coating composite conductive fabric, test its shielding effectiveness. The results show that the composite conductive fabric in the frequency range of 30 ~ 1500MHz SE can reach more than 25dB shielding rate of 94.38% or more, has a certain electromagnetic shielding function.

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