Red fluorescence nanofiber with piezoelectric function and preparation method of red fluorescence nanofiber with piezoelectric function

A technology of red fluorescence and nanofibers, which is applied to the chemical characteristics of fibers, rayon manufacturing, textiles and papermaking, etc., can solve the problems of low content of β crystals, no fluorescence, and poor piezoelectric properties of nanofibers, so as to improve the quality of β crystals. content, the effect of excellent piezoelectric performance

Active Publication Date: 2019-07-12
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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Problems solved by technology

In the prior art, the more common method of preparing PVDF with high β crystal form is to induce the generation of β crystals by adding nucleating agent fillers, but the content of β crystals in existing PVDF materials is generally low, and PVDF is a semi-crystalline polymer. The crystallinity is generally about 50%. Since the α crystal phase is the most stable structure, the crystal structure formed after cooling or casting from the solution is dominated by α crystals and does not have fluorescence. Therefore, the piezoelectric properties of existing PVDF nanofibers poor

Method used

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  • Red fluorescence nanofiber with piezoelectric function and preparation method of red fluorescence nanofiber with piezoelectric function
  • Red fluorescence nanofiber with piezoelectric function and preparation method of red fluorescence nanofiber with piezoelectric function
  • Red fluorescence nanofiber with piezoelectric function and preparation method of red fluorescence nanofiber with piezoelectric function

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preparation example Construction

[0025] A nanofiber with red fluorescence and piezoelectric function, the preparation method thereof may specifically include the following steps:

[0026] Step A, according to the molar ratio of the first component: 2-thienoyltrifluoroacetone (TTA): the second component=0.5~2:1~3:1~3, the first component, 2-thiophene Formyl trifluoroacetone and the second component are respectively dissolved in absolute ethanol and mixed together, after stirring for 12 to 24 hours, the resulting precipitate is washed with water and ethanol in sequence, and then dried to obtain a red fluorescent rare earth complex thing.

[0027] Step B, dissolving polyvinylidene fluoride (PVDF) with an average molecular weight of 53400 in the third component, and then adding acetone (AC) to stir and mix to obtain a mixed solution of polyvinylidene fluoride; according to the red fluorescent rare earth complex : The mass ratio of the polyvinylidene fluoride=1-5:10, dissolving the red fluorescent rare earth comp...

Embodiment approach

[0030] (1) In step A, the first component is europium nitrate hexahydrate (Eu(NO 3 ) 3 ·6H 2 O) or europium chloride hexahydrate (EuCl 3 ·6H 2 O) at least one; the second component is at least one of o-phenanthroline (Phen) or triphenylphosphine (TPPO).

[0031] (2) In step B, the third component is at least one of dimethylsulfoxide (DMSO) or N,N-dimethylformamide (DMF). In the polyvinylidene fluoride mixed solution, the mass concentration of polyvinylidene fluoride is 10%-18%, and the volume ratio of the third component to acetone is 2:8-8:2.

[0032] (3) In step B, the mass ratio of the red fluorescent rare earth complex to the polyvinylidene fluoride is 1-5:10, preferably 4-5:10; when the red fluorescent rare earth complex is mixed with the When the mass ratio of polyvinylidene fluoride is 4-5:10, the fluorescence properties of the finally prepared nanofibers are significantly better than other ratios. By adjusting the mass ratio of the red fluorescent rare earth comp...

Embodiment 1

[0038] A nanofiber with red fluorescence and piezoelectric function, the preparation method thereof may specifically include the following steps:

[0039] Step a1, according to europium nitrate hexahydrate (Eu(NO 3 ) 3 ·6H 2 O): 2-thienoyltrifluoroacetone (TTA): o-phenanthroline (Phen) = 1:3:1 molar ratio, weigh 2.2305g of Eu(NO 3 ) 3 ·6H 2 The TTA of O, 3.3327g, the Phen of 0.9011g; Dissolve Eu(NO with 5ml absolute ethanol 3 ) 3 ·6H 2 O, then dissolve TTA and Phen with 6ml of absolute ethanol, add NaOH solution dropwise in the TTA that dissolves, adjust the pH value to 6~7; Then dissolve the Eu(NO 3 ) 3 ·6H 2 O and Phen were added dropwise to TTA, and after magnetic stirring for 12 hours, the precipitate was filtered with a funnel, washed, put into an oven, heated to 80°C and dried under vacuum to obtain a red fluorescent rare earth complex . The red fluorescent rare earth complex is Eu(TTA) 3 Phen, emits the characteristic red fluorescence of europium under ultra...

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Abstract

The invention discloses a red fluorescence nanofiber with a piezoelectric function and a preparation method of the red fluorescence nanofiber with the piezoelectric function. The method includes steps: dissolving a first component, 2-thenoyltrifluoroacetone and a second component into absolute ethyl alcohol, mixing, stirring for a period of time, and washing and drying a precipitate to obtain a red fluorescence rare earth complex; mixing polyvinylidene fluoride, a third component and acetone, and adding the red fluorescence rare earth complex to obtain electrospinning precursor solution; performing electrospinning by adopting the electrospinning precursor solution to obtain the red fluorescence nanofiber with the piezoelectric function. The nanofiber has an excellent fluorescence propertyand is capable of emitting red fluorescence, fluorescence intensity controllability is realized, beta crystal content of the nanofiber is at least 85% and reaches 97.76% maximally, excellent piezoelectric energy is achieved, and the preparation method is simple, feasible and available for batch production.

Description

technical field [0001] The invention relates to the field of piezoelectric polymer materials, in particular to a nanofiber with red fluorescence and piezoelectric function and a preparation method thereof. Background technique [0002] Piezoelectric materials are a class of materials that can generate voltage across the material when subjected to stress such as pressure. When the surface of the material is subjected to mechanical stress, the electric charge generated on the surface of the material is proportional to the magnitude of the applied stress. This phenomenon is called piezoelectric effect (piezoelectricity). Piezoelectric materials include piezoelectric crystal materials, piezoelectric ceramic materials and piezoelectric polymer materials, and piezoelectric polymer materials are characterized by their flexibility, light weight, high toughness, temperature stability, low acoustic impedance and mechanical impedance. received more widespread attention. [0003] PVDF...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/48D01F1/10
CPCD01F6/48D01F1/10
Inventor 师奇松孙天远夏宝桢梁永日
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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