氮掺杂氧化石墨烯的制备及其对棉织物的负载改性

Preparation of nitrogen-doped graphene oxide and load modification of cotton fabrics

为开发具有阻燃、导电复合功能织物,制备了氮掺杂氧化石墨烯,并利用其对棉织物进行负载改性。测试改性前后棉织物的质量增重率、阻燃、表面比电阻及断裂强力、抗弯刚度等服用性能,分析氮掺杂氧化石墨烯负载改性棉织物的可行性。结果表明:分散液(氮掺杂氧化石墨烯/氧化石墨烯)对棉织物负载改性的最佳质量浓度为6 g/L。在此质量浓度下,改性棉织物的质量增重率、极限氧指数、断裂强力及抗弯刚度均随分散液(氮掺杂氧化石墨烯/氧化石墨烯)负载改性次数的增加而上升,表面比电阻与透气率则随氮掺杂氧化石墨烯负载改性次数的增加而降低。负载改性到达一定次数时,各项性能指标趋于稳定。同时,氮掺杂氧化石墨烯负载改性棉织物的交联稳定性优于氧化石墨烯负载改性棉织物,使得氮掺杂氧化石墨烯负载改性棉织物的质量增重率、极限氧指数、断裂强力与抗弯刚度高于氧化石墨烯负载改性棉织物,表面比电阻与透气率低于氧化石墨烯负载改性棉织物。水洗负载改性7次的改性棉织物,发现水洗4次时的性能指标与未经水洗负载改性1次的性能指标相当。文章发现利用氮掺氧化杂氧化石墨烯负载改性来制备复合功能棉织物具有可行性,为氧化石墨烯材料在功能织物中的应用提供了一定的参考价值。

Graphene has good thermal,electrical,and mechanical machinability,and the special boundary effect also gives graphene a controllable two-dimensional material surface,making it an ideal flame retardant,thermal insulation and conductive material.The defect is that the band gap of graphene is zero,the valence band and conduction band are difficult to open in the Brillouin zone,and the internal resistance caused by the accumulation of graphene sheets is large,which hinders the exploitation of graphene's electrical properties.Nitrogen atom doping can regulate the microstructure and electrical conductivity of graphene.By preparing nitrogen-doped graphene oxide,nitrogen-doped graphene dispersion and graphene oxide dispersion were used for the load modification of cotton fabrics.The micro-morphology,mass gain rate,limiting oxygen index,surface specific resistance,breaking strength bending stiffness and air permeability of the modified cotton fabric loaded by the two kinds of dispersion were tested and analyzed.The aim was to develop fabrics with composite functions such as flame retardancy and conductivity The results showed that the optimum loading concentration of nitrogen-doped graphene oxide/graphene oxide dispersion on cotton fabric is 6 g/L.Under the concentration,with the increase in load modification times,the coating on the surface of the cotton fabrics became increasingly denser,the mass gain rate,limiting oxygen index,breaking strength and flexure stiffness all increased,while the surface specific resistivity and air permeability showed a decreasing trend.The above test indicators increased as the number of load modifications rose,and when the number of load modification reached a certain number,the indicators tended to stabilize.When the cotton fabrics modified seven times with the loading modification were washed,the mass gain rate,limiting oxygen index,breaking strength and bending stiffness of the cotton fabrics modified by loaded modification decreased,while the surface specific resistance and air permeability were increasing.The indicators after four washing times were roughly equivalent to those of one load modification.At the same time,it could be seen from the test results that the crosslinking stability of cotton fabrics modified by nitrogen-doped graphene oxide was superior to that of cotton fabrics modified by graphene oxide,so the weight gain rate,limiting oxygen index,breaking strength and bending stiffness of cotton fabrics modified by nitrogen-doped graphene dispersion liquid were better than those of cotton fabrics modified by graphene,and the surface specific resistance and air permeability were worse than those of graphene-loaded modified cotton fabrics.It is concluded that using KH550 as crosslinking agent,it is feasible to develop composite functional fabrics by modifying cotton fabrics with dispersion liquid(nitrogen-doped graphene oxide/graphene oxide).