Preparation And Properties Of Chalcopyrite-natural Rubber Thermoelectric Composites

In this work,chalcopyrite-natural rubber thermoelectric composite material was prepared by natural rubber as the matrix and chalcopyrite with thermoelectric properties as the filler.The rubber processing technology such as plasticate,mixing and vulcanization was used.The effects of chalcopyrite content,particle size,surface properties and graphite addition on the structure,morphology and thermoelectric properties of the composites were studied by X-ray diffraction,scanning electron microscopy,infrared analysis,thermoelectric coefficient,thermoelectric power,conductivity and thermal conductivity measurement.The following results are obtained.(1)The chalcopyrite-natural rubber composites have better thermoelectric power than chalcopyrite.The thermoelectric power of the composites increases with the increase of chalcopyrite addition volume and gradually exceeds that of chalcopyrite itself.(2)The particle size of chalcopyrite has an effect on the thermoelectric power of chalcopyrite itself and its composites.With the decrease of chalcopyrite particle size,the thermoelectric power of chalcopyrite first increases and then decreases.At the same time,the thermoelectric power of chalcopyrite-natural rubber composites is related to its internal chalcopyrite size.The smaller the particle size of chalcopyrite in the composites,the larger the thermoelectric power of the composites.(3)Using stearyldimethylbenzylammonium chloride as organic modifier,chalcopyrite was modified by wet and dry methods,and organic chalcopyrite-natural rubber composite was prepared.The thermoelectric stability of the composites is better than that of the chalcopyrite-natural rubber composites,but the thermoelectric power of the composites is lower than that of the unmodified chalcopyrite-natural rubber composites.(4)The mechanism of improving thermoelectric power of chalcopyrite-natural rubber composites is explored.The particle size of chalcopyrite in composites has a major influence on its thermoelectric power.The particle size of chalcopyrite in composites decreases and the specific surface area increases.During heating,the specific surface area increases and more phonons are produced.Under the phonons dragging,the movement speed of electrons is accelerated,thus improving the thermoelectric power of composites.