Effect of interface and confinement size on the crystallization behavior of PLLA confined in coaxial electrospun fibers
作者： Shu-Fen Zou , Rui-Yang Wang , Bin Fan , Jun-Ting Xu , Zhi-Qiang Fan
DOI: 10.1002/APP.45980
关键词:
摘要: Poly(l-lactide)/polyacrylonitrile (PLLA/PAN) core-sheath composite fibers were fabricated by coaxial electrospinning. The crystallization behavior of PLLA within the electrospun was studied differential scanning calorimetry (DSC). PLLA/PAN fiber with a diameter ∼32 nm (C1) exhibits temperature (Tc) 22.5 °C higher but cold-crystallization (Tcc) 10 °C lower than bulk PLLA. crystallinity C1 is also In both isothermal melt- and cold-crystallization, in crystallizes faster PLLA, as revealed smaller half times (t1/2). enhanced crystallizability may be attributed to increased nuclei number crystal growth rate induced PAN surface, i.e., surface-induction effect. However, suffers nano-confinement effect exerted sheath fiber, which can suppress crystallization. When too small (< 32 nm), prevail over effect, leading slower crystallinity. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 135, 45980.
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