Investigation On Infrared Radiation And Microwave Reflection Property Of Polypyrrole And The Composites With Polypyrrole

It is important to control the infrared radiation energy in keeping clothes warm, building energy conservation and military camouflage; as the first method used in the field of modern stealth technology, the microwave reflection control also has an important role in the the electromagnetic shielding and labor protection and so on. Though metal (especially the silver) has lower infrared emissivity, it is limited to be used because of its large weight, high price and poor compatibility with the other electromagnetic microwave range. Polypyrrole (PPy) has been regard as the most promising conductive polymer due to its facile synthesis, lower price monomer, environment stability and tunable properties. PPy with proper degree doping possess a wide range of infrared reflectivity and excellent microwave performance can be used as infrared radiation and microwave control compatible material. In this paper, using Polypyrrole as the main material, the PPy doped with different surfactants, PPy/multi-wall carbon nanotubes (MWCNTs) and PPy/carbon fiber(CF) were prepared. The infrared radiation properties and the electromagnetic parameters of these materials were mainly discussed. The main contents in this paper are showed as follows:1. Doped with different surfactants, the PPy materials were synthesized by different oxidants in situ polymerization. The effects of different surfactants and oxidants on the conductivity, infrared emissivity and electromagnetic parameters of the PPy materials were studied, the rules were researched that the effects of the dopants on the infrared emissivity and microwave performance Interaction patterns.2. Sodium dodecylbenzene sulfonate was used as surfactant to disperse MWCNTs and then the composite was synthesized by in-situ polymerization at different MWCNTs content. The rule of the composite’s infrared emissivity and the microwave electromagnetic parameters changes with the MWCNTs content increasing was investigated and also their mechanism was explained.3. Sodium dodecylbenzene sulfonate was used as surfactant to disperse CF and then the composite was synthesized by in-situ polymerization at different CF content. The surface of the carbon fiber is coated with a layer of doped PPy. The infrared emissivity of the composite was investigated and the change of PPy/CF itself radiates infrared energy when the ambient temperature rises was studied. It was proved that combine PPy and CF is an effective method to control infrared radiation. The electromagnetic properties of the composite were investigated. The carbon fiber content that makes the microwave and infrared features mutually compatible was determined.