| With the development of modern science and the improvement of living standards,people’s requirements for fabrics are not limited to cover and warmth.Waterproof electrochromic fabrics have two functions of waterproof and discoloration,and will become a hot research topic in the field of intelligent fabrics in the future.This kind of textile has great military value,especially for military stealth,including camouflage clothing,gun cover,military buildings and so on.The stealth fabric possesses both waterproof and electrochromism features,which is suitable for various combat situations.It can be used as camouflage clothing in various weather conditions including rain and snow.Waterproof electrochromic fabric requires both excellent waterproof performance and higher stability than common electrochromic material to adapt to complex and harsh field combat environment.Therefore,this thesis is divided into two parts:preparation and study of electrochromic materials and waterproof coatings.In the first part of this thesis,star-shaped polyaniline(SAPNI)electrochromic materials with high stability were prepared by emulsion polymerization with triphenylamine(TPA)as the core.The structure of the materials were characterized by TGA,FTIR and Raman.The electrochemical and electrochromic performances were tested by Cyclic Voltammetry,UV-vis spectrometer and electrochemical workstation.The results show that with increased TPA loading,the thennal stabilities of SPANI are increased.With 4.0 mol.%of TPA added,the weight loss of SPANI is 36.9%at 700℃,which is much lower than 71.2%for PANI at same temperature.Low oxidation potentials and a large enclosed area of CV curves indicate that SPANI possess higher electrochemical activities than PANI.Enhanced electrochromic properties including high optical contrast and good electrochromic stabilities of SPANI are also obtained.With 1.6 mol.%of TPA loading,SPANI exhibits highest optical contrast of 0.71,which is higher than 0.58 for PANI,0.66 for SPANI-0.4%and 0.63 for SPANI-4.0%.Overdosing of TPA will result in slow switching speed,which could be caused by the slow ion transport in the short branched chain of star-shaped PANI during the electrochromic process.The long term stability test confirms that all of SPANI based devices have better satiability than PANI based device.In the second part of this thesis,the waterproof coating was fabricated on outer layer of polyester fiber for stealth fabrics application.A novel organosilicon waterproof agent was prepared by introducing long-chain alkyl groups into the side-chain of organosilicon.The optimum reaction formula and finishing process were determined by orthogonal experiment and control variable method.The structure and morphology of the materials were characterized by FTIR and SEM.The optimum weight ratio is 6:5:100 for silane coupling agent:long carbon chain siloxane:(D4).The optimum concentration of water-proofing agent is 35 g/L.The optimum finishing process is immersion time(4 min),baking time(180 s)and baking temperature(170℃).Organosilicon waterproofing agent was modified by introducing three fluoro propyl and constructing micro-nanostructure on the surface of fabric.The waterproofing effect of the modified organosilicon waterproofing agent was investigated through the spray test and contact angle test.The results show that the contact angle of the finished fabric surface first increases and then decreases with the increase of nano-calcium carbonate(CaCO3)and graphene oxide(GO)content.The contact angle reaches its maximum 143°,when 3g CaCO3 is added.The waterproof grade is increased from 3 or 4 to 4 or 5 grade.When GO content is 0.5%,the contact angle of finished fabric surface reaches its maximum 144.9°.The waterproof grade is also increased to 4 or 5 grade. |
