A linear actuator with layered microphase structure and its preparation method

Abstract

The invention relates to a linear actuator with a layered microphase structure and a preparation method thereof. The linear actuator with a layered microphase structure is a fiber or a spline, and the substrate is composed of a layer A (by block copolymer X and block copolymer Y) Composed of A block) and B@C composite layer (composed of B block in block copolymer X and C block in block copolymer Y, the two are combined by hydrogen bond or ionic bond) alternately connected ; The preparation method is: after the block copolymer X, the block copolymer Y and the organic solvent are made into a mixed solution, the mixed solution is processed into a film as a casting solution and then cut into splines, or the mixed solution is used as a spinning solution Processed into fibers; block copolymer X and block copolymer Y are ABA type triblock copolymer and ACA type triblock copolymer, or ABA type triblock copolymer and AC type diblock copolymer, Or AB type diblock copolymer and ACA type triblock copolymer. The invention effectively solves the problems of small work and instability of the current linear driver.

Description

technical field [0001] The invention belongs to the field of actuators imitating biological tissue structures, and relates to a linear actuator with a layered microphase structure and a preparation method thereof. Background technique [0002] Due to their potential applications in the fields of smart materials, soft robots, and sensor devices, linear actuators have received important international attention in recent years. The Institute of Science and Technology Strategic Consulting of the Chinese Academy of Sciences and the Documentation and Information Center of the Chinese Academy of Sciences pointed out in the report "2020 Research Frontiers" , "Bionic muscle hydrogel" in the field of chemistry and materials science is ranked ninth in the preface of the hot topics in materials science. Therefore, linear actuators have important scientific and developmental significance for the research and invention of bionic artificial muscles. [0003] Regarding muscle, take animal s...

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Problems solved by technology

[0004] The prior art discloses a large number of studies on imitating muscles or sarcomeres, such as literature 2 (J.Am.Chem.Soc.2021, 143(2), 902-911; Materials Chemistry Frontiers 2019, 3(11), 2463 -2471) and the bionic structure in Document 3 (Acs Macro Letters 2020, 9(11), 1507-1513; Adv. Funct. Mater. 2021, 2007437), which are not layered structures, It cannot imitate the layered structure of the sarcomere, and it cannot be driven or reversibly stable (that is, it cannot do work in a cycle). Moreover, compared with human skeletal muscle, it has the problems of low work density, slow drive, low power density, and small drive expansion ratio.

The actuating material of the layered structure reported in the prior art can only be bent and cannot be stretched, that is, it is not a linear actuator, such as literature 4 (Langmuir 2015, 31(18), 5015-24; Chemphyschem 2017, 18(11), 1451- 1465)

Regarding the research on linear actuators, polymer artificial muscle actuators such as liquid crystal elastomers disclosed in Document 5 (Advanced Functional Materials 2020, 30(32)) have a single external response ability and can only respond to a single temperature or light or heat. In addition, most actuator materials rely on volume shrinkage to achieve the purpose of expansion and contraction. In order to obtain an excellent expansion ratio, it is often achieved by increasing the aspect ratio of the actuator, but swelling in the radial direction of the actuator is still unavoidable. , which eventually lead to shortcomings such as small drive expansion ratio and poor work ability

[0005] Therefore, it is of great significance to study a driver and its method that can biomime the animal tissue structure (such as the sarcomere layered structure) and overcome a series of problems such as small work and instability of the current linear driver.

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