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Reinforced heat-resistant polylactic acid electrostatic spun fibrous membrane and preparation method therefor

A technology of electrospinning and electrospinning solution, which is applied in the field of reinforcing heat-resistant polylactic acid electrospinning fiber film and its preparation, can solve the problem of large addition of reinforcing materials, small increase in strength and heat resistance, and polylactic acid phase. problems such as poor capacitance, to achieve the effect of saving dissolution time, increasing heat resistance, and improving tensile strength

Active Publication Date: 2016-07-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the modified polylactic acid electrospun fiber membranes in the prior art, the strength and heat resistance of which are relatively small, the amount of reinforcing material added is relatively large, and the compatibility with polylactic acid is not good. The present invention provides a Reinforced heat-resistant polylactic acid electrospun fiber membrane and preparation method thereof

Method used

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  • Reinforced heat-resistant polylactic acid electrostatic spun fibrous membrane and preparation method therefor
  • Reinforced heat-resistant polylactic acid electrostatic spun fibrous membrane and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 163 mg of graphene oxide ultrasonically dispersed in 100 mL of methanol, add 1.487 g of zinc nitrate hexahydrate, stir to fully mix and dissolve, and at the same time weigh 0.801 g of dimethylimidazole and dissolve in 100 mL of methanol, then mix the above two solutions. Stir it to react for 1h, let it stand for 3h, centrifuge, wash, and dry to prepare a composite enhancer.

[0028] Weigh 1.09g of polylactic acid and dissolve it in 8mL of dichloromethane, and magnetically stir for 2h to fully dissolve it. Weigh 1.09 mg of the composite enhancer and disperse it in 2 mL of N’N-dimethylformamide, and sonicate it for 30 minutes to make it evenly dispersed. Subsequently, under stirring, the dispersion of the composite enhancer was added dropwise to the polylactic acid solution and mixed, and blended for 3 hours. Electrospinning of the electrospinning solution is carried out with an electrospinning device, the setting voltage is 17KV, the spinning solution advancing speed...

Embodiment 2

[0030] Weigh 163 mg of graphene oxide ultrasonically dispersed in 100 mL of methanol, add 1.487 g of zinc nitrate hexahydrate, stir to fully mix and dissolve, and at the same time weigh 1.602 g of dimethylimidazole to dissolve in 100 mL of methanol, and then mix the above two solutions. Stir to react for 1h, stand for 8h, centrifuge, wash, and dry to prepare a composite enhancer.

[0031] Weigh 1.55g of polylactic acid and dissolve it in 8mL of dichloromethane, and magnetically stir for 2h to fully dissolve it. Weigh 1.09 mg of the composite enhancer and disperse it in 2 mL of N’N-dimethylformamide, and sonicate it for 30 minutes to make it evenly dispersed. Subsequently, under stirring, the dispersion of the composite enhancer was added dropwise to the polylactic acid solution and mixed, and blended for 6 hours. Electrospinning of the electrospinning solution is carried out with an electrospinning device, the setting voltage is 24KV, the spinning solution advancing speed is 1mL...

Embodiment 3

[0033] Weigh 163 mg of graphene oxide ultrasonically dispersed in 100 mL of methanol, add 1.487 g of zinc nitrate hexahydrate, stir to fully mix and dissolve, and at the same time weigh 1.602 g of dimethylimidazole to dissolve in 100 mL of methanol, and then mix the above two solutions. Stir it to react for 1h, leave it to stand for 6h, centrifuge, wash, and dry to prepare a composite enhancer. figure 1 It shows that ZIF-8 is successfully loaded on graphene oxide sheet.

[0034] Weigh 1.39 g of polylactic acid and dissolve it in 8 mL of dichloromethane, and magnetically stir for 2 hours to fully dissolve it. Weigh 1.39 mg of the composite enhancer and disperse it in 2 mL of N’N-dimethylformamide, and sonicate it for 30 minutes to make it uniformly dispersed. Subsequently, under stirring, the ZIF-8 dispersion was added dropwise to the polylactic acid solution and mixed, and blended for 3 hours. Electrospinning of the electrospinning solution is carried out with an electrospinning...

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Abstract

The invention discloses a reinforced heat-resistant polylactic acid electrostatic spun fibrous membrane and a preparation method therefor. The electrostatic spun fibrous membrane comprises polylactic acid matrix resin and a composite reinforcing agent, wherein the composite reinforcing agent is a graphene oxide sheet with the surface loaded with a zeolite imidazate framework ZIF-8. The preparation method for the electrostatic spun fibrous membrane comprises the steps of mixing a polylactic acid solution with a certain concentration with an ultrasonic dispersion solution of N'N-dimethylformamide of the composite reinforcing agent according to a ratio by adopting a solution mixing method, and then performing electrostatic spinning under a certain process condition through an electrostatic spinning method to prepare the electrostatic spun fibrous membrane. Compared with a pure polylactic acid fibrous membrane, the electrostatic spun fibrous membrane has the advantages that both the tensile strength and break elongation rate of the polylactic acid fibrous membrane are remarkably improved; the heat resistance of the polylactic acid fibrous membrane is remarkably enhanced; and the electrostatic spun fibrous membrane is biodegradable, safe, reliable, odor-free and low in human body and environmental harm and pollution degree, thereby having wide application values in the fields of biomedicines, packages, textiles, traffic, electronics, electric equipment and the like.

Description

Technical field [0001] The invention belongs to the technical field of reinforcement of polylactic acid materials, and specifically relates to a reinforced heat-resistant polylactic acid electrostatic spinning fiber membrane and a preparation method thereof. Background technique [0002] Polylactic acid (PLA), a biodegradable material, its electrospun fiber membrane has high specific surface area, porosity, good mechanical properties and biocompatibility. It is used in biomedicine, packaging, textile, transportation, electronics , Electrical equipment and other fields have good application prospects. However, the poor mechanical properties and low heat resistance of polylactic acid limit its further application. Therefore, it is very necessary to improve the heat resistance of polylactic acid. [0003] Adding reinforcing materials is the most commonly used method for heat-resistant enhancement and modification of polylactic acid fiber membranes. Graphene oxide can reinforce the ...

Claims

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Application Information

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IPC IPC(8): D04H1/728D04H1/435D01D1/02D01D5/00D01F1/10
CPCD01D1/02D01D5/003D01F1/10D04H1/435D04H1/728
Inventor 代秀王新龙曹雨李嘉玮石小卫霍长安
Owner NANJING UNIV OF SCI & TECH
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