Textile/Polypyrrole Composites for Sensory Applications

Abstract

Electrically conductive woven, knitted, and nonwoven composite fabrics are prepared by in situ chemical polymerization of pyrrole using suitable oxidant and dopant. These composite fabrics show surface resistivity in the range ∼1 to 2 kΩ. These composite fabric can alter their resistivity with various stimuli such as mechanical strain, pH, and humidity. So, in the present study, their response to pH, humidity, and mechanical strain is investigated. For all fabrics, similar behaviour has been observed regarding pH versus resistivity. The resistance of the composite fabric increases with the increase of alkalinity of pH. However, as bending strain increases, resistance steeply decreases for cotton fabrics, steeply increases for polyester fabrics, and initially decreases and then increases for wool fabrics. Regarding humidity sensitivity, sigmoid curves have been obtained for all kinds of fabrics.

Developments in conducting polymer fibres: from established spinning methods toward advanced applications

“…209 It is worth noting that a large number of prepared PPy composite fibres have been employed for sensor applications. 18,132,210 An overview of the studies performed on composite PPy fibres is given in Table 5. 153,214,215 In recent time, limited cases described preparation of composite PEDOT:PSS fibres through wet spinning method.…”

Polyaniline Deposition on the Surface of Cotton Fibers: Structural Studies, Swelling Behavior, and Water Absorption Properties

“…is incidence proved that the surface chemistry of cotton fibers is notably hydrophilic [17,39], which is diminished up on in situ deposition of polyaniline thereby introducing hydrophobicity to the system [25,39]. Water absorption features of polyaniline-deposited cotton fibers are increased on further washing by chloroform (compare values of cycle II and III).…”

“…Among many substrates, cotton (Gossypium hirsutum) fiber belongs to the Gossypieae tribe, which grows comfortably in the USA, South America, India, Egypt, Sudan, South Africa, and Ethiopia [16]. It has a soft and crystalline fibrous structure, which possesses a fairly strong mechanical property and low density [17].…”

Medical textiles

“…Carbon fibres [657] iv. Intrinsically-conductive polymers such as polythiophene or its more-easily processable derivative, poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) or (PEDOT:PSS) [658], polypyrrole (PPy) [659], or polyaniline (PANI) [660] are used as coatings on non-conductive fibres because in filament form these polymers are very stiff. v. Non-conductive or weakly-conductive fibres given a conductive coating with a dispersion such as carbon black, a metal coating or treatment with CNTs, or cotton fibres given a graphene coating is continuing to develop [661] Each of these approaches has its strengths and weaknesses [662].…”