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Poly-L-lactic acid nanofiber based light-transparent composite material and preparation method thereof

A technology of L-polylactic acid and nanofibers, applied in fiber types, fiber treatment, non-woven fabrics, etc., can solve various problems such as complex parameters, low content of reinforcing fibers, unstable process, etc., and achieve low adverse effects on light transmission , Improve mechanical properties, good light transmittance effect

Active Publication Date: 2020-02-28
NANTONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still many defects in the nanofiber-reinforced transparent composites prepared by coaxial co-spinning: (1) The various parameters involved in coaxial electrospinning are relatively complicated, the process is unstable, and not all of the prepared fibers are shell-core Structure; (2) The content of reinforcing fibers in the composite material is low, and the effect of improving the mechanical properties of the material is not significant. If the content of the reinforcing material is increased, the supply rate of the core material during spinning must be increased, resulting in the diameter of the reinforcing fiber being greater than 400nm , which ultimately affects the light transmittance of the composite material; (3) The performance of the reinforcement fiber-matrix interface cannot be changed

Method used

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  • Poly-L-lactic acid nanofiber based light-transparent composite material and preparation method thereof
  • Poly-L-lactic acid nanofiber based light-transparent composite material and preparation method thereof
  • Poly-L-lactic acid nanofiber based light-transparent composite material and preparation method thereof

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preparation example Construction

[0027] The invention provides a kind of L-polylactic acid nanofiber-based light-transmitting composite material and a preparation method thereof, comprising the following steps:

[0028] 1) dissolving L-polylactic acid (PLLA) in an organic solvent, and stirring evenly to obtain a L-polylactic acid solution;

[0029] 2) dissolving polymethyl methacrylate (PMMA) in acetone, and stirring uniformly to obtain a polymethyl methacrylate solution;

[0030] 3) Electrospinning is carried out by using L-polylactic acid solution, and the L-polylactic acid nanofiber membrane is obtained after vacuum drying;

[0031] 4) Lay the L-polylactic acid nanofiber membrane on the release paper, drop polymethyl methacrylate solution to completely impregnate the L-polylactic acid nanofiber membrane, and obtain the L-polylactic acid nanofiber-based light-transmitting composite after fully drying. Material.

[0032] In the present invention, PLLA is added into an organic solvent, and the PLLA solution...

Embodiment 1

[0038] (1) Dissolve 1 g of PLLA in 10 g of trifluoroethanol with an electronic analytical balance, stir for 24 hours until completely dissolved, and obtain a PLLA solution with a concentration of 10 wt %;

[0039] (2) take by weighing 4g PMMA and be dissolved in the acetone of 20g with electronic analytical balance, stir 24h to dissolve completely, obtain the PMMA solution of concentration 20wt%;

[0040] (3) Electrospinning was carried out using an electrospinning machine with a spinneret diameter of 1.2mm. The electrospinning conditions were as follows: the voltage was 10kV, the receiving distance was 10m, the injection rate of the spinning solution was 1mL / h, and the receiver was flat plate, the relative humidity of the environment is 40%, and the ambient temperature is 25 °C; then vacuum-dried to obtain a PLLA nanofiber film with a thickness of 50 μm, the scanning electron microscope picture is as follows figure 1 As shown in Figure A, the results show that the surface of ...

Embodiment 2

[0043] (1) Take 1g PLLA and dissolve it in 10g chloroform with an electronic analytical balance, stir for 24h until completely dissolved, and obtain a PLLA solution with a concentration of 10wt%;

[0044] (2) Take by weighing 4g PMMA and be dissolved in the acetone of 20g with electronic analytical balance, stir 24h to dissolve completely, obtain concentration 20wt% PMMA solution;

[0045] (3) The electrospinning machine with a spinneret diameter of 1.2 mm is used for electrospinning, and the electrospinning conditions are as follows: the voltage is 10 kV, the receiving distance is 10 m, and the injection rate of the spinning solution is 1 mL / h, The receiver is a flat plate, the relative humidity of the environment is 40%, and the ambient temperature is 25 ° C; then vacuum-dried to obtain a 50 μm thick PLLA nanofiber film, as shown in the scanning electron microscope figure 1 As shown in Figure B, the results show that the surface of PLLA nanofibers has holes, and the area of ...

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Abstract

The invention belongs to the technical field of composite materials and discloses a poly-L-lactic acid nanofiber based light-transparent composite material and a preparation method thereof. By adoption of PLLA (poly-L-lactic acid) which is high in compatibility to PMMA (polymethyl methacrylate) and similar to the same in refractive index, a poly-L-lactic acid nanofiber membrane is prepared according to an electrospinning technique; then, PMMA solution is added dropwise to obtain the poly-L-lactic acid nanofiber based light-transparent composite material. The preparation method is simple, and the prepared poly-L-lactic acid nanofiber based light-transparent composite material is high in transparency and remarkably improved in mechanical performances such as impact resistance, thereby beingquite suitable for application to places with high requirements on light weight, impact resistance and the like.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to an L-polylactic acid nanofiber-based light-transmitting composite material and a preparation method thereof. Background technique [0002] Plexiglass (such as polymethyl methacrylate, PMMA), because of its excellent light transmission performance, good processability, unbreakable and light weight, it is widely used in many fields such as car windows, face shields, spectacle lenses and aircraft window covers. It is widely used, but its mechanical properties, especially its mechanical strength and impact toughness are low. The use of electrospun nanofibers to reinforce light-transmitting polymer resins has become an effective means that does not affect the light-transmitting properties of polymer resins, but there are still problems in the selection of reinforcement materials and the surface bonding between fibers and substrates. It is well known that the surface bondi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D01D5/00D06M15/263D06M101/32
CPCD04H1/728D01D5/003D06M15/263D06M2101/32
Inventor 袁卉华魏硕姚波熊峰李碧云
Owner NANTONG UNIVERSITY
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