Study on hot-pressing enhancement process and properties of melt differential electrospinning polylactic acid ultrafine fiber membrane

Abstract

Abstract: There is an urgent demand for degradable high-strength breathable membranes in the fields of food and pharmaceutical packaging. To address this issue， a technology to prepare poly（lactic acid）（PLA） packaging membranes was proposed in this paper. The effects of hot-pressing temperature， pressure， and time on the tensile strength and elongation at break of melt differential electrospun PLA micro-nanofiber membranes were investigated through single factor experiments. The Design-Expert 11 software was used to design experiments and analyze the experimental results. Response surface methodology was used to optimize the process parameters of fiber membrane hot pressing， and the obtained optimal value was verified through experiments. The results indicated that the optimal hot-pressing process parameters were determined to be a hot-pressing temperature of 40 ℃， a hot-pressing pressure of 4 MPa， and a hot-pressing time of 6 s on the basis of the response surface method. The unidirectional average tensile strength of the PLA fiber hot-pressed membrane treated under this condition was 27.613 MPa， which was 149.89 % higher than that of untreated fiber membrane. This datum has a relative error of 0.684 % with the predicted value， indicating a good fitting effect. The hot-pressing treatment can enhance the tensile strength of melt differential electrospun PLA fiber membranes effectively and therefore improve the application potential of PLA fiber membrane products in the field of packaging.

Key words: response surface methodology, hot pressing process, melt differential electrospinning, poly（lactic acid） fiber membrane, tensile strength

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