Study on toughening modification of poly（lactic acid） melt differential electrospun fiber membrane by dendrimer

doi:10.19491/j.issn.1001-9278.2024.02.002

Abstract

Abstract:

Poly（lactic acid）（PLA） was modified through melt blending with dendritic polymer CYD⁃T151 as a plasticizer. The effects of CYD⁃T151 content， spinning temperature and spinning voltage on the mean diameter， diameter distribution 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 temperature 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.

Key words: dendritic polymer, melt differential electrospinning, poly（lactic acid） fiber membrane, fiber diameter, tensile mechanical property

CLC Number:

TQ340.64

TAN Jing, WANG Zhi, WANG Shuo, FU Hongyan, LI Changjin, LI Haoyi, YANG Weimin, ZHANG Yang. Study on toughening modification of poly（lactic acid） melt differential electrospun fiber membrane by dendrimer[J]. China Plastics, 2024, 38(2): 7-13.

Figures/Tables 13

Fig.1. Melt differential electrospinning device

Fig.2. Size of the extruded spline

Fig.3. MFR of PLA and PLA/CYD⁃T151 at different temperature

Fig.4. Effect of CYD⁃T151 content on average diameter and diameter distribution of the PLA/CYD⁃T151 fibers

Fig.5. Variation curve of mean fiber diameter and diameter standard deviation under different CYD⁃T151 contents

Fig.6. Effect of spinning temperature on average diameter and diameter distribution of the PLA/CYD⁃T151 fibers

Fig.7. TG curves of CYD⁃T151 and PLA

Fig.8. Variation curve of mean fiber diameter and diameter standard deviation of PLA/CYD⁃T151 at different spinning temperature

Fig.9. Effect of spinning voltages on average diameter and diameter distribution of the PLA/CYD⁃T151 fibers

Fig.10. Variation curve of mean fiber diameter and diameter standard deviation of PLA/CYD⁃T151 under different spinning voltage

Fig.11. Effect of CYD⁃T151 content on mechanical properties of the fiber membranes

Fig.12. Effect of spinning temperature on mechanical properties of the fiber membranes

Fig.13. Effect of spinning voltages on mechanical properties of the fiber membranes

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