| Environmental protection,ecology,intelligence,digital textile clothing is the global theme of the 21 st century,people’s requirements for clothing are no longer limited to beauty and warmth,a variety of intelligent materials combined with micro-electronic technology and clothing integration,more and more intelligent clothing appears in people’s vision.Flexible actuator is a flexible device that can respond to a variety of conditions.Combined with clothing,it can give clothing a variety of functions,such as humidity and heat management,environmental perception,motion assistance,etc.In view of people’s demand for functional clothing to enhance human function,this paper prepared three kinds of flexible actuators with different functions through the selection of low-cost and highly sensitive response materials and structural design.Damp-heat managed thin-film actuator: A double-layer thin-film actuator is prepared using commercial low-density polyethylene（LDPE）and graphene as raw materials and graphene slurry is deposited on the surface of low-density polyethylene by scratch coating method.The raw materials are commercially available,making it possible to manufacture on a large scale.There is a great difference in thermal expansion coefficient between graphene and LDPE,and the actuator can respond sensitively within the temperature range of 10 ℃.The actuator shows excellent performance under photothermal and electrothermal conditions.LDPE has orientation and the actuator can show multi-motion directivity.The actuator can be used for humidity and heat management in smart clothing.The bending and recovery of the actuator can be controlled through temperature change to help the human body heat dissipation or warmth.Thin film actuators for gas sensing: Three kinds of thin film actuators were prepared using carbon nanotubes（CNTs）,reduced graphene oxide（r GO）and metal carbide（MXene）as substrates by spin-coating polydimethylsiloxane（PDMS）,respectively.The thermal expansion coefficient of CNTs,r GO and MXene is two orders of magnitude different from that of PDMS.According to the properties of the material,the actuator prepared is in the initial state of bending,which has a "pseudo-memory effect".The actuator can produce sensitive and large deformation at low voltage.Through comparative analysis of conductive film materials,applied electrical signals,actuator thickness ratio,actuator cycle stability and other aspects,it is found that CNT-PDMS actuator has both excellent actuator performance and cycle stability,which has the most potential to be applied in smart clothing.Through the design and integration of the actuator,smoke sensor and protective suit,a "smart protective suit" that can sense the environment is designed.Motion assisted spiral artificial muscle: using polyethylene fiber and metal yarn as raw materials,two kinds of cheap artificial muscles with different structures,namely multifilament artificial muscle and mandrel wound artificial muscle,were prepared by twisting and Mandrel winding.Polyethylene fiber has high flexibility and high strength.As the main body of artificial muscle,metal yarn has high conductivity and high temperature resistance,which can provide heat for the main body.The two kinds of artificial muscles have their own advantages.The multifilament artificial muscle has about 18% deformation ability and can lift 100 times heavier than itself.The artificial muscle wound with mandrel has weak weight lifting ability,but has about 50% deformation ability.The large deformation and output force of artificial muscle show great application prospects in the field of wearable sports assistance. |
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