| The successive appearance of foldable optoelectronic products has made the prospect of flexible transparent conductive films broad.Silver nanowires(AgNWs)/polymer composite conductive films have been widely used in optoelectronic fields such as transistors,sensors and solar cells due to their excellent optoelectronic properties and excellent mechanical flexibility.However,the substrate materials of composite conductive films are mainly petroleum derivatives which is difficult to degrade and easily cause environmental pollution.In this thesis,two kinds of silver nanowire/polylactide-based composite conductive films were prepared by utilizing the advantages of polylactide,such as renewable,biocompatible,and biodegradable.The research content mainly includes the following two parts:(1)Study on preparation and properties of silver nanowire/poly(L-lactide):poly(D-lactide)(AgNW/PLLA:PDLA)composite conductive films.The AgNW/PLLA:PDLA composite conductive films were prepared by Meyer-rod coating and blade coating methods.The optoelectronic properties,surface roughness and mechanical properties of the composite conductive films were studied,and the sheet resistance stability of the composite conductive film in 10,000 cycles of bending test and 1000 times of tape adhesion test was analyzed.The results showed that the composite conductive film exhibited excellent optoelectronic properties(T=68.6%,R_s=15.7Ω/sq),low surface roughness(RMS=3.29±2.80 nm),excellent mechanical properties,good sheet resistance stability.Organic light-emitting diodes(OLEDs)based the composite conductive films exihibited good brightness even in a bent state.The waste OLEDs degraded by 91%after being immersed in sodium hydroxide solution(pH=13,37 ~oC)for 132 hours,showing good hydrolytic degradation performance.(2)Study on preparation and properties of zinc oxide/silver nanowire/stereocomplex polylactide(ZnO/AgNW/SC-PLA)composite conductive films.Based on the AgNW/PLLA:PDLA composite conductive films,the ZnO/AgNW/SC-PLA composite conductive films were fabricated by ultrasonic spraying ZnO film,annealing the film at high temperature and cooling the film in deionized water(room temperature)rapidly.The effect of annealing temperature on the inducing homocrystallites(HCs)to stereocomplex crystallites(SCs)transition in PLLA:PDLA was discussed.The optoelectronic properties and mechanical properties of the composite conductive film were studied.The composite conductive films were tested in 500 cycles of bending test,200 times of tape adhesion test and applied in Light emitting diodes(LED)circuits to test its conductivity stability.The results showed that annealing the composite conductive film at 200 ~oC for 30 minutes can induce all HCs to SCs in PLLA:PDLA;the composite conductive films possessed good optoelectronic performance(T=51.7%,R_s=39.3Ω/sq),more outstanding mechanical properties(tensile strength and tensile modulus),excellent mechanical flexibility and conductivity stability.The prepared SC-PLA films measured in sodium hydroxide solution(pH=13,37 ~oC)have a slower degradation rate than that of PLLA and PLLA:PDLA films,showing its superior resistance to hydrolysis degradation.In summary,this dissertation designed a simple preparation process to prepare two kinds of degradable silver nanowire/polylactide-based composite conductive films,which provided new choices for the development of the green optoelectronic industry in the future. |
