Progress of Preparations and Applications of Piezoelectric Elastomer Composite Materials
Piezoelectric materials can convert the discrete mechanical energy such as human movements in the environment into electrical energy,which provides an energy supply for wearable sensors,self-powered devices,etc.Compared with piezoelectric polymer matrices such as polyvinylidene fluoride and nylon 11,polymer elastomers have lower Young's modulus and higher strain.Using polymer elastomers as composite matrix could greatly improve the volume fractions of piezoelectric ceramics,endow composites with excellent flexibility,generate small stress and large deformation,and eventually contribute materials with excellent strain transfer ability.Therefore,piezoelectric elastomer composites,which combine the high piezoelectric property of piezoelectric ceramics and the large deformation advantage of elastomers,have attracted extensive attentions in the scientific community.This paper reviewed the research statuses and development trends of piezoelectric elastomer composites,and summarized the types of piezoelectric elastomer composites,such as silicone-based composites,polyurethane-elastomer-based composites and polyolefin-based composites.The preparation and molding methods of composites were summarized.The application statuses of piezoelectric functional composites in various fields were reviewed,such as self-powered electronics,energy harvesting,and biomedical fields.Finally,the future development directions of piezoelectric elastomer composite materials were also explored.
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