Preparation Of Elastic Nanofibers And Their Applications On Water Filtration And Pressure Sensor

Because of good elasticity and biocompatibility,Poly(ethylene-co-ocetene)copolymer(POE)and polyurethane(PU)elastomer have been widely used in those fields,such as:pressure sensor,flexible wearable electronic devices,filtration and so on.POE elastic nanofiber was prepared by melt phase separation method in this experiment firstly,and then POE elastic nanofier suspension was fabricated by dispersing POE elastic nanofiber into ether by ultra high speed shearing.POE@Ag elastic conductive nanofiber membranes were prepared by plating silver on the surface of POE nanofiber.Effects of silver nitrate concentration on the morphology,electrical and mechanical properties of POE@Ag elastic conductive nanofiber,were explored.Results of experiment showed that POE elastic nanofiber,the average diameter of which was about 600 nm,with Good morphology could be prepared,when the material composition was 45% CAB 381-20+45% CAB 551-0.2+10%POE and the extrusion temperature was 220 ?.As silver nitrate concentration was 4g/L,POE@Ag elastic conductive with good comprehensive performance and cycle stability could be prepared.POE@PPy elastic nanofiber conductive ink was prepared by means of in-situ polymerization.The stability of conductive ink and the morphology,hydrophilicity,electrical and mechanical properties of POE@PPy nanofiber membranes were tested.The results showed that when the Py addition is POE:PPy=2:1,POE@ PPy nanofiber membrane has the best comprehensive performance.And the contact angle,conductivity,elastic modulus,tensile strength and elongation at breakis of it were respectively 116o,1.593S/m,5.013 MPa,0.743 MPa and 79.54%.Surface structured conductive nanofiber membranes were prepared by means of template pouring,and then assembled into a pressure sensor.The plane and section morphology of surface structured conductive nanofiber membranes were characterized.And effects of single or double layer structure and thickness of them on the sensitivity,criticalpressure range of pressure sensor were explored,and the cycle stability of pressure sensor which assembled by 48 um surface structured conductive nanofiber membrane was tested.The results experiment showed that the sensitivity of double layer was higher than the single layer at low pressure,on the contrary at high pressure.The sensitivity both at low pressure and high pressure of pressure sensor were good,and low pressure range was wide,when the thickness of the surface structured membrane is 48 um.And the response time of it was 10~13ms.Beaded PU/EVOH composite nanofiber could be fabricated by melt phase separation method.The morphology,diameter,hydrophilicity and pore size distribution of beaded PU/EVOH composite nanofiber with different concentration of PU was evaluated.The results indicated that the PU/EVOH nanofiber has bigger diameter,larger pore size,worse hydrophilic,and beaded structure is more obvious with the increase of PU concentration.PU/EVOH nanofiber/PET non-woven fabric composite membranes were prepared by coating PU/EVOH nanofiber onto the surface of PET non-woven in this experiment.To evaluate the filtration properties of nanofibrous membranes,PNPs suspension was selected as the contaminant for the rejection rate test.The pure water flux,reject rate,stability and durability of composite membrane were tested.The results showed that when PU addition was 15% and PU/EVOH nanofiber coated weight is 4g/L,composite membrane had excellent filtering performance,included pure water flux was 2512L/(m2 ? h),The retention rate was97.81%,filtration flux was 832L/(m2?h),the flux could be reached 800L/(m2?h)after filtering for 10 h.Due to possess looser structure and larger porosity,the water flux of PU/PVA-co-PE composite nanofiber membrane was also higher than the pure PVA-co-PE nanofiber membrane.All of the results demonstrated the advantage of beaded PU/PVA-co-PE composite nanofibers and great potential in the application to water treatment.