HPNGO/TPU复合纳米纤维的制备及其结构与性能研究

Preparation and structural properties of HPNGO/TPU composite nanofibers

以N,N-二甲基甲酰胺(DMF)为溶剂、超支化聚酰胺修饰的氧化石墨烯(HPNGO)和热塑性聚氨酯(TPU)为原料,采用静电纺丝法制备了HPNGO/TPU复合纳米纤维。通过扫描电子显微镜、傅里叶变换红外光谱仪和动态力学分析仪研究了不同添加量的HPNGO对HPNGO/TPU复合纳米纤维的形貌、结构及性能的影响。结果表明:HPNGO/TPU复合纳米纤维直径与HPNGO的添加量成反比关系,纤维拉伸强度和初始模量与HPNGO的添加量成正比关系;当添加HPNGO质量分数(相对TPU)为3%时,HPNGO/TPU复合纳米纤维直径最小,平均直径为0.17μm,拉伸强度和初始模量最大,分别为3.884,0.193 MPa,断裂伸长率最小为170.2%;HPNGO的加入对TPU的分子结构无影响,二者之间为物理复合。

Hyperbranched polyamide modified graphene oxide/thermoplastic polyurethane(HPNGO/TPU)composite nanofibers was prepared from HPNGO and TPU by electrospinning using N,N-dimethylformamide(DMF)as solvent.The effects of different HPNGO addition on the morphology and structural properties of the HPNGO/TPU composite nanofibers were investigated by scanning electron microscopy,Fourier infrared spectrometry and dynamic mechanical analyzer.The results showed that the diameter of the HPNGO/TPU composite nanofibers was inversely proportional to the amount of HPNGO when the tensile strength and initial modulus of the fiber was proportional to the amount of HPNGO;when the mass fraction of HPNGO was 3%based on TPU,the diameter of HPNGO/TPU composite nanofibers was minimized with the average diameter of 0.17μm,the tensile strength and the initial modulus reached a maximum of 3.884 MPa and 0.193 MPa,respectively,and the elongation at break exhibited a minimum value of 170.2%;and the addition of HPNGO had no effect on the molecular structure of TPU,and they were physically compounded.