Preparation And Research Of The Flexible Sensing Conductive Polymer Based On Shape Memory Polyurethane

The development of science and technology brings lots of convenience to human beings.Especially wearable flexible sensor electronics has attracted widespread attention.Therefore,it’s particularly significant to exploit wearable flexible sensor electronics.Shape memory polyurethane(SMPU)as one kind of novel smart materials earns the leader status in materials due to its excellent properties.In this paper,the shape memory polyurethane is utilized as flexible matrix compositing with conductive films such as carbon nanotubes(CNTs)/silver particles(AgNPs)and reduced graphene oxide(rGO)/carbon nanotubes to construct novel flexible sensing conductive films,whose sensing performance is highly studied.The primary contents and conclusions are as follows:1.The CNT/AgNPs composite conductive films with different contents of silver particles were designed and prepared applying solution blended process.Through the transfer method,CNT/AgNPs/SMPU flexible sensing conductive films were fabricated.The characterized means of Scanning Electron Microscope(SEM)and Differential Scanning Calorimetry(DSC)were utilized to analyze the micromorphology and thermal properties of samples,respectively.The electro-mechanical properties was measured by electrochemical workstation and tensile testing machine.Meanwhile,the shape memory functions of conductive films were studied by designing thermo-mechanical programming.Consequently,the fixed rate and recovery rate of SMCAg-30 were 89.2% and 84.3%,respectively,of which gauge factor(GF)up to 48 was higher than other samples.2.The reduced graphene oxide/carbon nanotubes/SMPU(rGO/CNT/SMPU)composite conductive films were designed and prepared using the transfer method.The micro-morphology and structure of samples were analyzed by Scanning Electron Microscope(SEM)and Fourier Transform Infrared Spectroscopy(FTIR)and Contact Angle Meter.The properties of water sensing and electrical sensing of rGO/CNT and rGO/CNT/SMPU were studied by electrochemical workstation.As a result,with the increase of content of reduced graphene oxide,the hydroelectric sensing performance of rGO/CNT and rGO/CNT/SMPUhave the similar regular,which show the tendency rising up at the beginning and declining in late.Among all the samples,the water sensing performance of rGO/CNT(5:5)and rGCS-50 samples were the best,of which change in resistance were 2 and 1.2,respectively.This discovery greatly enriched the application fields of flexible sensor devices.3.The rGO/CNT/SMPU composite conductive films as matrix were applied with a conventional two-electrode system to electroplate a layer of copper onto it.After that,the rGO/CNT/SMPU/AgNPs/PFDT superhydrophobic conductive films were obtained by replacing silver and immersing into PFDT solution.The micromorphology was observed during preparation through Scanning Electron Microscope(SEM)and the contact angle was measured through Contact Angle Meter.In this paper,the shape memory properties of rGO/CNT/SMPU were studied,and the sensing performance of rGO/CNT/SMPU and rGO/CNT/SMPU/AgNPs/PFDT were studied.The data show that rGO/CNT/SMPU/AgNPs/PFDT possess high sensitivity and superhydrophobic ability.