Effect of the electrical conductivity of core solutions on the morphology and structure of core–shell CA-PCL/CS nanofibers. (15th November 2017)

• Record Type: Journal Article
• Authors: Wang, Lihua; Yang, Huan; Hou, Jiazi; Zhang, Wanxi; Xiang, Chunhui; Li, Lili
• Is Part Of: New journal of chemistry. Volume 41:Number 24(2017)
• Page Start: 15072
• Page End: 15078
• Publication Date: 2017-11-15
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c7nj02805a
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : CA-PCL/CS nanofibers with controllable core to shell ratios were prepared by altering the electrical conductivities of core solutions. Abstract : Core–shell structured cellulose acetate-polycaprolactone/chitosan (CA-PCL/CS) composite nanofibers were electrospun via coaxial electrospinning. Different solvents were used in core solutions, which led to different electrical conductivities in core solutions. The effect of the electrical conductivity on the morphology and structure of core–shell fibers was studied emphatically. As shown in the scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images, the increasing electrical conductivity of core solutions would result in smaller diameter ratios of core to shell, thinner overall diameters and more inhomogeneous diameter distributions. Additionally, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) all demonstrated that the interactions between cores and shells weakened with the increase of electrical conductivity of core solutions, and this might lead to different diameter ratios of cores to shells in the fibers. The results provide a basis for further design and optimization of processing conditions to control the nanostructure of core–shell composite nanofibers.