Thermoresponsive conductive polymer composite thin film and fiber mat: Crosslinked PEDOT:PSS and P(NIPAAm-co-NMA) composite

Abstract

ABSTRACT:The thermoresponsive conductive composite (TCC) thin films and fiber mats, whose electrical property changed with temperature, were fabricated successfully. The thermocrosslinkable and thermoresponsive copolymer, poly (N-isopropyl acrylamide-co-N-methylolacrylamide) (PNN), was synthesized. The TCC thin film and fiber mat were fabricated by spin coating and electrospinning process of PEDOT:PSS/ PNN solutions, respectively. After thermocrosslinking and doping by DMSO, the composite thin films and fiber mats were obtained. Fibrous structures of TCC fiber mats were observed by SEM. The surface resistance and conductivity of composites were measured. The thermoresponsivity and swelling ratio of TCCs were also studied. The thermoresponsive conductive property was analyzed by measuring the surface resistance of TCCs in water bath under various temperatures from 20 to 50 8C. With the increase of temperature, the TCCs shrank to be dense structure and showed lower surface resistance. The TCC fibers mat exhibited greater sensitivity to temperature than thin film owing to its fibrous structure.

Improvement of the Performance of Plantation Wood by Grafting Water-Soluble Vinyl Monomers onto Cell Walls

“…The remained water-soluble vinyl monomers in the treated d -cellobiose and EHL have been removed before analysis. The signals in the NMR spectra of the samples were assigned according to previous articles. − The 1 H NMR spectra of untreated and treated d -cellobiose are shown in Figure a, d, respectively. The peak at 4.97 ppm was corresponded to −OH (C 2′ ) in d -cellobiose.…”

Overview of Silica-Polymer Nanostructures for Waterborne High-Performance Coatings

“…Different approaches have been used to implement this strategy. For example, dispersions containing N -methyloacrylamide or N -ethylacrylamide have been studied ( Figure 2 A), but were found to produce byproducts that are either toxic (formaldehyde) or result in the formation of low molecular weight polymers with weak mechanical properties [ 7 , 33 , 34 , 35 ]. On the other hand, the use of the reversible keto-hydrazide crosslinking reaction ( Figure 2 B) resulted in a small improvement of the mechanical properties of the film because of its low reaction rate, and in addition, hydrazide has toxic effects [ 36 , 37 , 38 ].…”

Electrospinning of Electroconductive Water-Resistant Nanofibers of PEDOT–PSS, Cellulose Nanofibrils and PEO: Fabrication, Characterization, and Cytocompatibility

“…Electrospun fibers of PEDOT–PSS have also been applied as a CO gas sensor by using a quartz crystal microbalance sensing platform and as sensors for inorganic NH 3 , HCl, and NO 2 gases and various alcohol and water vapors as well as methanol, ethanol, tetrahydrofuran, and acetone by the measurement of resistance changes. The thermoresistivity of a polymer film underneath an electrospun PEDOT–PSS fibrous mat has been recorded by the resistance change of PEDOT . A transparent electrospun PEDOT–PSS layer has also been used as a conductive electrode in optoelectronic applications .…”

“…Several attempts have been made to improve the water resistance of nanofibrous mats. The property of cationic starch to bind with anionic nanocellulose has been used, the addition of a thermocrosslinkable monomer to the polymer dispersion has been applied, chemical cross-linking agents such as (3-glycidyloxypropyl)­trimethoxysilane or ethylene glycol diglycidyl ether have been used, a heat-treatment step has been used to improve the bonding between the carrier polymer and PEDOT–PSS and the electrospun fibrous mats have been subjected to glutaraldehyde vapors to induce cross-linking of the fibrous structure.…”

“…The thermoresistivity of a polymer film underneath an electrospun PEDOT−PSS fibrous mat has been recorded by the resistance change of PEDOT. 26 A transparent electrospun PEDOT−PSS layer has also been used as a conductive electrode in optoelectronic applications. 27 Furthermore, PEDOT−PSS electrospun nanofibers have been applied as efficient scaffolds for neuronal cell attachment allowing manipulation of the cell morphology 28 and as a swellingresistant soft electrode material.…”