《Table 1 Viscosity and conductivity of the PLA and PLA/CNF solution》

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《"Morphological, Mechanical and Thermal Properties of Poly(lactic acid)(PLA)/Cellulose Nanofibrils(CNF) Composites Nanofiber for Tissue Engineering"》

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The typical FE-SEM images and the corresponding diameter distribution of electrospun neat PLA and PLA/CNF composite nanofiber membranes，are presented in Fig.2 and Table 2，respectively.The morphology of all electrospun fibers showed homogeneous，smooth，and free beads.Meanwhile，the average diameter of the PLA/CNF composite nanofiber decreased compared to that of PLA nanofiber due to the introduction of CNF，especially for the PLA/CNF3composite nanofiber.Such finding can be explained as follows:the conductivity of the PLA/CNF solution improves in comparison with that of the PLA solution.Therefore，the larger the solution conductivity is，the higher charge density on the surface of the ejected jet is formed，causing the stronger repulsive forces between the polymer chains in the electric field，and then the formed diameter of composite nanofiber become thinner.It can be concluded that the conductivity of the electrospinning solution is one of the most important factors for the diameter of the fibers[29-31].However，when CNF loading is more than 3%，the average diameter of the composite nanofiber increases with the increase of the CNF content.This phenomenon can be explained by two main reasons.First，the decrease in the conductivity of the solution（see the results in Table1）induces less stretching during the electrospinning process.Second，the higher the content of CNF，the more CNF entrapment inside the PLA matrix，resulting in the larger diameter of the composite nanofiber.This results are consistent with other reported results[27].For reference，the SEM image of the original CNF is provided in Fig.2（f）.