Preparation And Characterization Of Conductive Cotton Fabrics Based On Carbon Black And Carbon Nanotubes

Based on the current situation of cotton and high surface area carbon materials(such as carbon black and carbon nanotubes),and aiming at the weak interface adhesion strength and the obscission of the surface function layer by multiple solution immersion method,and the potential damage to the cotton wearability by the blinder in the coating method,this paper developed a new type of finishing modified method based on cellulosic feedstocks by“micro-dissolution”technology.The carbon black/cotton composites and carbon nanotube/cotton composites were prepared,and this paper discussed the influence to the structure and properties of cotton fabric after micro-dissolving process.Concrete research content is as follows:(1)The dissolution of cotton in the NaOH/urea system was investigated in the low temperature condition of-10oC.The cotton fiber and cotton fabric were dipped in the system of 7%(wt)NaOH/12%(wt)urea aqueous solution,then treated by 5%(wt)sulfuric acid/5%(wt)sodium sulfate aqueous solution.This paper would get a series of treated cotton fiber and cotton fabric after washing and drying.The results show that the characteristic peaks of the infrared spectrum of the micro-dissolved cotton fiber and cotton fabric has no change comparing to untreated cotton,;as can be seen from the X-ray diffraction curve,there was added a new characteristic peak at 2?=20.77°on the treated cotton's curve,belong to cellulose II,as a result,after processing,the part crystal type of cotton changed from cellulose I to cellulose II;after micro-dissolved,the tensile strength of cotton fabric has changed little;it is can be seen that the color of cotton became shallow after processing on the polarizing microscope photos.The appearance of the above phenomenon is the reason of the crystallization of fiber was destroyed after dipping treatment in NaOH/urea system at low temperature,and even dissolved a certain extent.(2)The preparation of carbon black/cotton composites.The cotton fabric was dipped in the 7%(wt)NaOH/12%(wt)urea/carbon black dispersion system,taking out and drying,and repeat this step,then treated in the 5%(wt)sulfuric acid/5%(wt)sodium sulfate aqueous solution,this paper would get a series of carbon black/cotton composites.The results show that infrared spectrum curve of the carbon black/cotton composite is similar to untreated cotton;the X-ray diffraction curve of the composites has not only the characteristic peak of cellulose I,but also the characteristic peak(2?=20.77°)of cellulose II and two characteristic peaks(2?=24.42°and 2?=43.71°)of carbon black;the thermal curves of the cotton fabric and composite are similar,and their thermal degradation temperature both are about 385oC,but the residual rate is increased from 9.71%to 13.05%by 3.34%;relative to the untreated cotton,composite's weft tensile strength did not change,but the composite's warp tensile strength decreased down from 127 N to 105 N after treating,and the strength retention rate is 82.67%;the resistivity of composite decreased with the increasing number of treating times,and the resistivity of composite tended to be more stable when the number of treating times achieved to 6 times,and the lowest resistivity of the composite was 0.7045 K?cm ~1 at 12 times;and the composite had a more higher washing fastness with the increasing number of treating times.(3)The preparation of carbon nanotubes/cotton composites.The cotton fabric was dipped in the 7%(wt)NaOH/12%(wt)urea/carbonnanotues dispersion system,taking out and rolling,and repeat this step,after treated in the 5%(wt)sulfuric acid/5%(wt)sodium sulfate aqueous solution,this paper would get a series of carbon nanotubes/cotton composites.The results show that infrared spectrum curve of the carbon nanotubes/cotton composite is similar to untreated cotton;the X-ray diffraction curve of the composites appears the characteristic peaks of cellulose I and cellulose II(2?=20.96°),as well as two characteristic peaks(2?=25.65°and 2?=43.15°),belong to carbon nanotubes;the thermal curves of the cotton fabric and composite are similar,and their thermal degradation temperature both are about 385oC,but the residual rate is increased 3.99%;relative to the untreated cotton,composite's weft tensile strength did not change,but the composite's warp tensile strength decreased down from 127 N to104 N after treating,and the strength retention rate is 81.89%;the resistivity of composite decreased with the increasing number of treating times,and the resistivity of composite tended to be more stable when the number of treating times achieved to 12,and the lowest resistivity of the composite was 0.2813 K?cm ~1 at 15 times;and the composite had a more higher washing fastness with the increasing number of treating times.