High-tensile piezoelectric microfiber with two-stage wave structure and manufacturing method thereof

Abstract

The invention relates to a high-tensile piezoelectric microfiber with two-stage wave structure and a manufacturing method thereof. The manufacturing method comprises: firstly, through an electrostaticspinning method, manufacturing on a two-dimensional programmable displacement table to obtain a piezoelectric polymer microfiber in an in-plane wave structure, then, transferring the piezoelectric polymer microfiber to a sticky and pre-stretched elastic matrix, gradually releasing pre-stretched stress to make the elastic matrix recover to original length, and finally obtaining the piezoelectric microfiber with two-stage wave polymer. A test result shows that the two-stage wave piezoelectric microfiber has deformation capability far exceeding the pre-stretched stress, and good and stable piezoelectric performance, and amplitude-wavelength ratio of the microfiber can be flexibly adjusted at will. The piezoelectric microfiber and the method have important application prospect in the field ofwearable piezoelectric transducers.

Description

technical field [0001] The invention relates to the technical field of fiber materials and flexible sensing materials, in particular to a high-stretch piezoelectric microfiber with a two-stage wave structure and a preparation method thereof. Background technique [0002] Piezoelectric strain sensors are self-powered electronic devices that can convert dynamic deformation into electrical signals to achieve sensing functions. Piezoelectric strain sensors with tensile deformation capabilities can be used as wearable piezoelectric devices for monitoring the human body / robot. Joint movement, human respiration, and external deformation stimulation have become research hotspots in the field of human-computer interaction in recent years. [0003] Piezoelectric material is a key component of piezoelectric devices, and its mechanical properties play a decisive role in the deformation ability of piezoelectric sensors. However, the intrinsic elongation at break of typical inorganic pie...

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Problems solved by technology

However, the whipping mode of the electrospinning jet is limited by the relative moving speed of the jet and the collecting plate. Generally, the wavy fiber can only be realized in a specific speed range, which limits the improvement of the amplitude-wavelength ratio of the in-plane wavy fiber. Therefore, It is necessary to rely on a large pre-stretch strain to prepare high-stretch PVDF piezoelectric fibers, which is not conducive to practical applications and tends to increase the inhomogeneity of the mechanical properties of the sensor

[0006] The Chinese patent CN105928452A previously submitted by the inventor discloses a preparation method of a tensile strain electric sensor, and further discloses a PVDF piezoelectric microfiber with an out-of-plane pop-up wave structure, although it can withstand 200% However, the problem of obtaining piezoelectric microfibers with large deformation capacity with a small pre-tensioning strain is still not solved

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