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Low-observable technology, often known as stealth technology, hides soldiers, aircraft, ships, submarines, missiles, satellites, and ground vehicles from radar and infrared sensors (preferably invisible). Stealth coating reduces radar cross section and makes aeroplanes harder to detect. Stealth planes employ radar-absorbing polymers. Stealth technology camouflages vehicles and buildings from radar. A radar-absorbent material may alter an items radar cross section at specific radar frequencies, but it does not make it \"invisible\" at any frequency. Stealth technology reduces radar reflections using radar-absorbing materials and geometry. Polymer composite-based stealth are graphene, carbon black, carbon nanotubes, and carbon fibres as carbonaceous material and filler. Stealth coating resin market size is based on epoxy, polyurethane, and polyimide. It also protects automobiles against ultraviolet rays, chips, scratches. Tanks and ships employ stealth coating technology to avoid hostile radar. The coating absorbs and scatters radar radiation, hiding the device. Military aircraft uses stealth coating to avoid radar. Commercial airlines are using stealth coating technologies to improve safety and security. The coating reduces aircraft drag and weight, improving fuel economy. Stealth coating absorbs radar signals, hiding the aircraft from radar detection systems. Military and private planes utilise it for security. Stealth coating reduces radar detection by absorbing or deflecting radar emissions. Military operations need stealth and secrecy, but civilian aviation may employ this technology to avoid hijackings and identify unlicensed planes radar-absorbent polymers cover stealth aircraft. These and other design features may weaken the aircraft's radar signal.

Recycling of poly(ethylene terephthalate) (PET) is a global concern due to generation of large volume of its post consumer waste and serious environmental problems caused as PET does not decompose in nature readily. Present research work aims at effective recycling of waste PET from soft drink bottles by aminolysis method and further utilization of the recycled product for high performance coating application. In the present study, we report aminoethylenethanolamine (AEEA) which till date is not studied much for chemical recycling of PET, having primary and secondary amine groups together with hydroxyl groups, for aminolysis reaction. The reaction parameters were optimized for conventional and microwave assisted technique by varying the ratio of raw materials, reaction time, temperature and power. The recycled oligomeric product was separated, purified and characterized for determination of amine value, hydroxyl value and by Fourier transform infrared spectroscopy, proton NMR (1H-NMR) spectroscopy. Further polyesteramides were successfully synthesized by partial replacement of neopentyl glycol by aminolyzed oligomeric product along with sebacic acid and phthalic anhydride. These resulting polyesteramides were further cured with commercial polyisocyanate curing agents and applied on mild steel panels. The cured coatings were evaluated for their optical, mechanical, chemical, thermal and anticorrosive properties. The partial replacement of recycled product of PET wastes exhibited comparative coating performance properties with respect to polyester polyol synthesized without any component based on recycled PET waste product.

Chemical recycling of polyethylene terephthalate (PET) waste has gained importance in last few decades due to its dramatic consumption through its variety of applications. This study employed conventional heating-mediated glycolysis of PET waste with excess ethylene glycol, catalyzed by zinc acetate, to achieve the monomeric product bis(2-hydroxyethyl terephthalate) (BHET). Further, three different hybrid unsaturated polyester–urethane resins were synthesized using recycled product BHET, urethane diol which was synthesized using nonisocyanate route of urethane synthesis, maleic anhydride and varying concentration of dimer fatty acid, citric acid and phthalic anhydride. These synthesized novel resins, hybrid unsaturated polyester–urethane possessed the unsaturated ester as well as urethane linkages in their polymer backbone. Comprehensive characterization of the synthesized hybrid resins and monomeric urethane diol was performed using established techniques. This included determination of hydroxyl value, iodine value and molecular weight via gel permeation chromatography (GPC). Additionally, Fourier-transform infrared spectroscopy and 1 H nuclear magnetic resonance spectroscopy were employed for structural elucidation. Subsequently, the formulated hybrid polyester–urethane resins were cured at room temperature using a styrene monomer, methyl ethyl ketone peroxide initiator and cobalt salt accelerator. A rigorous evaluation of the cured coatings was conducted to determine their optical properties, mechanical performance and chemical resistance. These properties are crucial for understanding the films' potential applications. Finally, thermal behavior was investigated using differential scanning calorimetry and thermogravimetric analysis.

Polyethylene terephthalate (PET) waste recycling has become a worldwide research interest for industries and academic institutes due its inevitable environmental impact. The main objective of current research work is to target efficient recycling of PET waste from mineral water bottles by the glycolysis method and subsequent use of the recycled product for value-added coating application. In the present study, we report on MP-diol (2-methyl-1,3-propanediol) which is not explored much for the chemical recycling of PET, having a branched aliphatic diol with two primary hydroxyls, for glycolysis reaction. The reaction parameters were optimized for microwave-assisted technique by varying the ratio of raw materials, reaction time, temperature, and power. The reaction parameters were optimized, and the recycled oligomeric product (OPETMPD) was separated, purified, and characterized by chemical and spectroscopic methods. Subsequently, dimethacrylated oligoesters of PET oligomer (UV oligomer) were synthesized by methacrylation of the glycolyzed PET product (OPETMPD). The synthesized UV oligomer was evaluated using chemical and spectroscopic methods. Ultraviolet (UV) radiation-curable formulations were prepared using synthesized UV oligomer and applied on wooden panels. The coatings were cured using UV-curing machine and evaluated for their performance properties. The partial replacement of UV oligomer in UV formulations exhibited comparative coating performance properties with respect to conventional UV formulation.