전기방사된 폴리아크릴로니트릴계 블렌드 섬유로 제조된 탄소나노섬유의 구조와 물성

Abstract

The relationship between the miscibility of the polymers in blend solutions and the pore structure of the carbon nanofibers spun from the blend solution was discussed. The miscibility of polyacrylonitrile (PAN) with poly(vinylidene fluoride) (PVDF) and poly(styrene-co-acrylonitrile) (SAN) was revealed by Hansen solubility parameter and dynamic mechanical analysis (DMA). Both Hansen solubility parameter and interaction parameter indicated that PVDF is more miscible with PAN. DMA results showed that PVDF was partially miscible with PAN, while SAN was immiscible. The interfacial tension between PAN and SAN, 4.66 mN/m, was higher than that between PAN and PVDF, 2.91 mN/m. The dominant pore morphology of carbonized PAN/PVDF blend fibers was slit-like structure, while that of carbonized PAN/SAN blend fibers was oval-shaped structure. Some pores in PAN/SAN blend fibers were found on the surface of the fiber, while PAN/PVDF blend fibers had mostly the internal pores. The specific surface area of the carbon nanofibers prepared from blend solutions was lower than that of the activated PAN fibers. However, PVDF blended fibers exhibited higher mesopore area ratio and SAN blended fibers had higher micropore area ratio than the fibers prepared by activation.