Preparation Of Polyaniline Grafted Conductive Textile And Its Performance

The conductive textiles have garnered much attention for their promisingapplications in smart clothing and wearable electronic devices, due to the excellentproperties of antistatic and electromagnetic shielding. In general, conductive textilesare prepared by compositing conductive moieties and fabric substrates via blending,alloying, coating or deposition methods. However, the weak interaction forces betweenthe conductive moieties and substrates, such as Van der Waals force and hydrogen bond,will limit the applications of conductive textiles. In this thesis, a conductive textile wassuccessfully prepared via covalently grafting polyaniline (PANI) onto cotton fabric bya three-step treatment process, including irradiation induced grafting polymerization,functional modification and in situ grafting polymerization of PANI.There are two parts in this thesis:Preparation of conductive textile by covalently grafting polyaniline onto cottonfabric. In order to obtain PANI grafted conductive fabrics, the anilino group was linkedonto pristine cotton fabric after modified with glycidyl methacrylate (GMA) and4-aminophenethylamine (APA), and then PANI was covalently grafted onto the modifiedcotton fabric via in situ redox polymerization. The results of chemical structure tests,microstructure tests and surface properties tests indicated that PANI was covalentlygrafted onto cotton fabric successfully. Furthermore, the effects of aniline concentrationand pH on degree of grafting of PANI (DGPANI), and the effects of DGPANIand pH onthe conductivity of APGC-g-PANI fabric were investigated.Properties investigation of the PANI grafted fabric, including effect of anilineconcentration and pH on DGPANIof PANI grafted fabric, pH Response of PANI graftedfabric and the investigation of dry-laundering durability of PANI grafted fabric. Theresults showed that the conductivity of PANI grafted fabric increased along with theincrease of DGPANI, and came to be stable while DGPANI>10.2wt.%, which indicatedthat a stable coductive network had formed on the fabric when the PANI layer reachedat a certain thickness. Further more, the conductivity could be adjusted through theprotonation and deprotonation processes of PANI grafted on the cotton fabric. And theprotonation process enhanced the conductivity, while the deprotonation process madethe PANI grafted fabric insulative. These processes were reversible after alternativelyimmersing PANI grafted fabric in acidic and alkaline bath solution, with no destruction to the structure and micromorphology. Investigation of dry-laundering durability ofPANI grafted fabric. The resultant conductive fabrics were able to withstand40simulated dry-laundering cycles, with almost no decay in the electrical conductivity,and with no destruction to the structure and micromorphology as well, indicating theirexcellent dry-laundering durability. The present strategy for fabricating conductivefabrics with excellent switchability of electrical properties and dry-wash durability isexpected to provide inspiration for the production of multifunctional conductive textilesfor use in hash or smart conditions.