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Effect of Precursor Solvent on the Occurrence of Stereocomplex Crystallization in Electrospun Polylactide Fibers
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DOI：10.1002/pola.70251.png)
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Abstract
En 中文
We conducted electrospinning to fabricate poly(l-lactide) (PLLA)/poly(d-lactide) (PDLA) fibers from chloroform (CF)/pyridine and CF/2,2,2-trifluoroethanol (TFE) solutions. The effects of the electrospinning solvent and spatial confinement on the stereocomplex crystallization of the electrospun fibers were investigated. Thermal treatment of PLLA/PDLA fibers prepared using CF/pyridine resulted in the coexistence of homocrystals (HCs) and stereocomplex crystals (SCs), with SCs being predominant. This phenomenon was attributable to the uniform dispersion of polymer chains in CF/pyridine, which reduced chiral complementary pairing, resulting in the formation of HCs and SCs. By contrast, dissolving PLLA/PDLA in CF/TFE caused the pairing of PLLA and PDLA chains. Electrospinning with CF/TFE facilitated stereocomplexation, leading to the development of SCs. The degree of confinement did not affect the occurrence of stereocomplexation. However, fibers with a larger diameter provided a larger internal space for chain movement, resulting in a larger number of crystal nuclei. Thus, the crystallite size decreased but the crystallinity increased. The crystal development in small-diameter fibers was strongly confined, which reduced the crystallinity but increased the crystallite size. The findings of this study can be used as a reference for controlling stereocomplex crystallization and fabricating fibers with desirable properties.
Keywords:
electrospun fiber
homocrystal
PDLA
PLLA
stereocomplex crystal
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