Textile Sensor Applications with Composite Monofilaments of Polymer / Carbon Nanotubes

Abstract

Polymer/carbon nanotube (CNT) composite monofilaments were produced and tested for sensing activity. Polylactide (PLA) was the polymer selected for humidity sensing, while a mixture of polypropylene (PP) and poly(ε-caprolactone) (PCL) was used for temperature sensing. The PP/PCL/CNT composite filaments developed a co-continuous structure with CNT localized in the PCL phase. The filaments were characterized in terms of tensile properties and electrical resistivity. Textile fabrics were produced with both types of filaments. The electrical resistance of the fabrics subjected to humidity or temperature variations was measured in a climatic chamber.

Improving Dyeing Parameters of Polyester/Cotton Blended Fabrics by Caustic Soda, Chitosan, and Their Hybrid

“…Caustic soda treatment of three textile fabrics types was performed in aqueous NaOH solution at temperatures of 80 o C and 100 o C, alkali concentrations were 30, 60 and 90 g/dm 3 and treatment time 20, 40, 60, 80 and 100 minutes. Sample mass was 5 g and solution volume were 200 cm 3 . After alkalization, the samples were neutralized with diluted glacialacetic acid followed by distilled water rinsing and dryingin air.…”

“…Chitosan treatment of three textile fabrics types was performed in freshly prepared solutions of chitosan with concentrations of1,7 and 14 g/ dm 3 (chitosan dissolved in 10 % acetic acid at pH 4) at Liquor ratio 1:40, 25 o C for 60 min with continuous stirring. The treated samples weresqueezed and driedin air at ambient temperature, washed with distilled water followed by dilutedglacial acetic acid, thendried again.…”

“…Chitosan is a biopolymer possessing reactive amino andhydroxyl groups and owing to its unique characteristics, chitosan has recently attracted scientific and industrial interests as a suitablesorbent for dyes in textile dyeing and wastewater treatment. The concentrations selected from chitosan in our investigation was 1,7 and 14 g/dm 3 . k/s value of a dyed materials has a close relationship to the amount of dye absorbed by thefabric.…”

“…The attacking hydroxide ion is not believed to diffuse into the polymer but rather act on the surface, splitting the ester bonds yielding an alcohol and a carboxylic acid [2]. Alkaline finishing of polyester fabric with caustic soda changes fabric weight, strength, wettability and aesthetics [3]. Cotton cellulose is readily depolymerized in acidic environments; however, its resistance to alkaline environments is higher T HE production of polyester fibers has been dynami cally increased, accompanied by the common use of polyester-cotton blends.In this research work, polyester (100%), cotton (100%), and polyester-cotton blend fabrics (50/50) have been subjected to treat with caustic soda, chitosan and their hybrid, followed by one-bath two-stage dyeing with reactive dye (Reactive Red 198 RR198), to study their dyeing performance and morphology.…”

Piezoelectric Flexible LCP–PZT Composites for Sensor Applications at Elevated Temperatures

“…acrylonitrile butadiene styrene (ABS) or polylactic acid (PLA) [1,[3][4], have been used as matrix material due to easy processing. Improvements in mechanical properties or added functionality have been accomplished by utilizing fillers such as barium titanate (BaTiO3) and carbon in many forms [5][6][7][8][9], up to 70 wt.% or 30 vol.%, respectively. Various additive manufacturing technologies enables fabrication of such materials [10] like fused-deposition modeling (FDM), where long thin filament of molten thermoplastic is extruded through heated nozzle [8].…”