【摘要】 以部分环化聚酰胺酸(PAA)为纺丝原液,采用高压静电纺丝法制备部分环化聚酰胺酸纳米纤维。测试纺丝原液的流变特性和纳米纤维毡的力学性能,用红外光谱和扫描电子显微镜表征纤维的酰亚胺化程度及其表面特征。结果表明:随着环化剂量的增加,聚酰胺酸的酰亚胺化程度增加;剪切速率提高,溶液剪切黏度减小;分子链刚性越强,黏度降低越明显;纺丝溶液黏度提高,纤维连续而伸直,直径变大;部分环化PAA纳米纤维毡的最大拉伸强度和弹性模量分别为16.87、254.77 MPa。更多还原

【Abstract】 Partially cyclized polyamide acid(PAA) solution was electrospun into nanofibers.The rheological properties of different PAA solutions and the mechanical properties of the resulting nanofibers were discussed.IR spectrum and SEM were used to characterize the imidized extent and surface morphology of nanofibers.The results showed that increasing the amount of cyclizing agent increased the imidized extent of PAA,the viscosity decreased when the shear rate increased,and more rigid the molecular chains,more obvious the decreasing of viscosity.Increasing the viscosity of the solution,the nanofibers became straight and the fiber diameter increased.The PAA nanofiber sheet′s maximum tensile strength and elastic modulus were about 16.87、(254.77 MPa),respectively.更多还原