Study on toughening modification of poly(lactic acid)melt differential electrospun fiber membrane by dendrimer
Poly(lactic acid)(PLA)was modified through melt blending with dendritic polymer CYD-T151 as a plasticiz-er.The effects of CYD-T151 content,spinning temperature and spinning voltage on the mean diameter,diameter distri-bution and tensile mechanical properties of PLA/CYD-T151 fibers in melt differential electrospinning were investigated.The results indicated that the addition of dendritic polymer CYD-T151 effectively improved the melt fluidity and reduced the fiber fineness.When the content of CYD-T151 was 1.25%,the spinning temperature was 240℃,and the spinning voltage was 55 kV,the melt electrospinning fiber exhibited an average fiber diameter of 1.360 μm,which was 49.72%lower than that of pure PLA.Dendritic polymer CYD-T151 as a plasticizer could effectively improve the toughness of the PLA-based melt electrospinning fiber membrane.When the content of CYD-T151 was 1.25%,the spinning tem-perature was 240℃,and the spinning voltage was 55 kV.The PLA/CYD-T151 fiber membrane obtained tensile strength and elongation at break of 11.50 MPa and 92.33%,respectively,which were 4.07%and 13.99%higher than that of pure PLA.
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