reflectance properties of brown mass dyed poly(ethylene terephthalate) filament yarns in the visiblenear infrared region

Near infrared and visible reflectance properties of brown mass dyed poly(ethylene terephthalate) melt spun filament yarns were studied compared to natural brown hue of desert areas. pigment red 177, pigment green 7 and carbon black particles were used in this investigation. near-infrared reflectance, mechanical and thermal properties as well as crystallinity of the camouflage poly(ethylene terephthalate) mass dyed filament yarns were measured. the obtained result indicated that by using an optimal content of the mentioned colored pigments and carbon black particles during the melt spinning operation could be achieved to desirable near infrared reflectance properties in the poly(ethylene terephthalate) drawn filament yarns. also, mechanical properties of the samples were acceptable evaluated. the samples with the highest concentration of pigments had the highest percentage of crystallinity. xrd results indicated that 2 sample with the highest concentration of pigments and additives among other samples had the greatest distance between the crystalline plates. maximum space between crystal layers is about 4.01-4.08 å. also, microstructural uniformity of the sample was confirmed by a low variation of samples.