Preparation And Properties Of PANI/SEBS Fiber Composite Film Conductive Elastomer

Conductive elastomers with excellent tensile properties and high electrical conductivity are often used as flexible strain sensors in the fields of human health detection,electronic skin,and wearable electronic devices.However,it is difficult for conductive elastomers to maintain the stability of electrical signals during dynamic stretching with large strains(>200%).In addition,when the conductive elastomer returns to the original position after straining,it takes a long time for the resistance value to return to the original value,and sometimes it does not even return to the initial value.Therefore,how to prepare conductive elastomers that can maintain stable electrical signals and short resistance recovery times during large strain processes has become one of the key issues in the study of conductive elastomers.In this topic,soluble polyaniline(PANI)was prepared by a simple emulsion pol ymerization-extraction method,and polyaniline(PANI)/poly(styrene-ethylene-butadiene-s tyrene)(SEBS)thin film conductive elastomer materials that can maintain electrical si gnals stability during large-strain dynamic stretching were prepared by co-dissolution method;At the same time,PANI/SEBS fiber felt was prepared by using electrospinni ng technology,which was compounded with PANI/SEBS film conductive elastomer materials to prepare PANI/SEBS fiber felt composite film conductive elastomer materi als with stable electrical signals and short resistance recovery time.The main researc h contents are as follows:(1)PANI toluene solution with high solid content(50 g/L)was prepared by emulsion polymerization-extraction method.Then,PANI/SEBS thin film conductive elastomer materials with different mass fractions were prepared by mixing with SEBS toluene solution by co-dissolving method.The dispersibility of the soluble conductive component PANI in the PANI/SEBS thin film conductive elastomer materials and the effect of PANI content on the mechanical and electrical properties of the thin film conductive elastomer materials were explored,and the stability and hysteresis of electrical signals during dynamic cyclic stretching of the thin film conductive elastomer materials were discussed.The results showed that the electrical and mechanical properties of the PANI/SEBS thin film conductive elastomer materials could be adjusted by changing the content of PANI in the thin film conductive elastomer materials.50 wt%PANI/SEBS thin film conductive elastomer materials had good cycle stability(1000 times at 200%strain),excellent tensile properties(elongation at break>600%),good thermal stability(room temperature to 200?)and good electrical conductivity(conductivity reached 0.125 S/cm).The thin film conductive elastomer materials could maintain the stability of the electrical signals during the stretching process of up to 400%strain.(2)PANI/SEBS fiber felt composite film conductive elastomer materials were prepared by electrospinning technology.The preparation process of PANI/SEBS fiber felt was studied,and the mechanical and electrical properties of the composite conductive elastomer materials,as well as the stability and hysteresis of electrical signals in different strain ranges were discussed.The results showed that the optimal preparation process of the fiber felt was as follows:the mass fraction of spinning solution was 40 wt%,the electrospinning voltage was 15 kV,and the propulsion speed was 0.5 mm/min.Compared with the simple PANI/SEBS thin film conductive elastomer materials,the composite conductive elastomer materials not only maintained the advantages of stable electrical signals during large-strain stretching,but also shortened the resistance recovery time(up to 89%).(3)The PANI/SEBS conductive textile fabric was prepared by combining PANI and elastic blended fabric by solution casting method,and its microstructure and related properties(mechanical,electrical properties)were studied.Secondly,the suitable working environment conditions of PANI/SEBS fiber felt composite film conductive elastomer materials and conductive textile cloth were explored.Finally,a simple detection of human joint motion was carried out using the composite conductive elastomer materials and the conductive textile cloth as wearable flexible strain sensors,respectively.The results showed that the suitable working environment conditions for the PANI/SEBS fiber felt composite film conductive elastomer materials were as follows:the humidity range was 40-60%RH,and the temperature range was 10-40?;the suitable working environment conditions for conductive textile fabrics were as follows:the humidity range was 40-50%RH,and the temperature range was 10-30?.Through simple detection of human joint motion,it was found that both the composite conductive elastomer materials and the conductive textile cloth had the potential as wearable flexible strain sensors.