Synthesis Of Carbon Nanotubes/Polymer Conductive Self-repairing Composites And Its Properties

As a new type of material which combines conductivity and self-repair,conductive self-repairing materials have attracted wide attention due to their applications in sensors,energy storage devices,electronic skin.Aging or mechanical damage seriously damages the life and reliability of electronic products.Therefore,it has become a research focus to introduce self-repair into conductive functional materials so that they can finish repair actively after being damaged.In this paper,self-healing conductive composites were prepared with modified multi-walled carbon nanotubes as conductive fillers,and their structures and properties were studied.This thesis is divided into the following two parts:Firstly,we have prepared conductive nanocomposites with high mechanical strength,high self-healing and adhesion.Therefore,the first topic of this thesis is to modify multi-walled carbon nanotubes by esterification of undecenol,and then to polymerize butyl methacrylate and dodecyl methacrylate by random copolymerization.The covalent binding between multi-walled carbon nanotubes and polymers avoids the problem of heterogeneous aggregation and dispersion of multi-walled carbon nanotubes in polymer matrix.Because multi-walled carbon nanotubes are covalently bonded with polymers,the composites have higher mechanical strength and conductivity,and higher self-healing efficiency.At the same time,there are thermal sensitivity,adhesiveness and injectability,which has potential applications in wearable field in the future.Another topic of this thesis is that MWCNT/PDA/PAA conductive composite hydrogels are prepared by in-situ polymerization using multi-walled carbon nanotubes as conductive medium and dopamine dadadine and acrylic acid as raw materials.The dispersion of MWCNT/PDA/PAA conductive hydrogel in aqueous solution was changed by modification with dopamine.The MWCNT/ PDA/PAA conductive hydrogel is similar to human skin and can repair its mechanical properties and electrical conductivity.In addition,conductive composite hydrogels exhibit good adhesion and mobility.At room temperature,MWCNT/ PDA/PAA conductive hydrogels can adhere to and support a variety of objects,such as glass,metals,plastics,paper,etc.The adhesion may be mainly due to the interaction of multiple hydrogen bonds and ?-?.By sticking conductive hydrogel to the finger joint,the resistance of MWCNT/PDA/PAA conductive composite hydrogel changes with the bending of finger.In the future,it can be used in biosensor or flexible wearable devices.