Investigation of electromagnetic shielding and solar properties of woven fabrics made by barium titanate/polyester bicomponent yarns

Abstract

In this study, electromagnetic shielding and solar properties of woven fabrics which were produced barium titanate/polyester bicomponent yarns were investigated. 1, 2 and 3% additive ratios of barium titanate and three different fabric structures (1/1 plain, sateen and special weave) were used in the experiments. The effect of additive ratio and the fabric structure on sheet resistance and electromagnetic shielding properties were evaluated. Electromagnetic Shielding Effectiveness (EMSE) of the woven fabrics was determined according to the ASTM D4935-10 standard by using coaxial transmission line measurement technique in the frequency range of 15-3000 MHz. The fabric with the highest content of the barium titanate (3%) and special weave showed the highest shielding effectiveness, reaching 13.96 dB at 15 MHz. The solar properties were measured according to EN14500 using a UV/VIS/NIR spectrophotometer and results were calculated according to EN 410 standard. The reflectance values of barium titanate added polyester fabrics increased and the transmittance values decreased.

Application issue of anthraquinonoid vat dyes on inherently flame‐resistant fabrics

“…In general, there are three types of inherently fire retardant fabrics: one involves fibres pretreatment and modification during production, the other refers to fibres that modify the structure to achieve fire retardancy without the need for further processing and treatments, and the third group includes inorganic and ceramic fibres 3–6 . Presently aramids, flame‐retardant polyester (FR PES) and flame‐retardant viscose fibres are the most well‐known and exploited inherently fire resistant fibres 7,8 . One of the first aramid fibres available, commercialised for the purpose of producing flame‐resistant textiles, was meta‐aramid fibre, known under the trade name Nomex®, produced by DuPont in 1967.…”

“…Meta‐aramid polymer, by the structure is the blend of m‐phenylenediamine and dichloride of m‐isophthalic acid, having excellent thermal and flame resistance properties which arise from their aromatic structure including high carbon/hydrogen (C:H) ratios and high content of aromatic double bonds 9 . This was followed by the production of para‐aramid fibre in the 1970s, having highly oriented domains of polymer molecules and containing high crystalline structure as well as high glass transition temperature 8,10 . In composition and structure of inherently flame‐retardant fabrics, these fibres are blended in order to optimise the protective properties, as well as comfort, durability and cost.…”

“…Para‐aramid fibres blended partners show properties of reducing the thermal shrinkage and are often blended with meta‐aramids in order to offset the inherent thermal shrinkage of the meta‐aramids. They are further mixed with Lenzing FR, polybenzimidazole (PBI), wool and modacryl 8,11–13 . Thermostable fibres are highly complex for dyeing involving numerous difficulties arising from their chemical structure such as the high degree of orientation of the macromolecules in the polymer chain, high crystallinity and density as well as pronounced intrinsic colouring.…”

“…[3][4][5][6] Presently aramids, flame-retardant polyester (FR PES) and flameretardant viscose fibres are the most well-known and exploited inherently fire resistant fibres. 7,8 One of the first aramid fibres available, commercialised for the purpose of producing flame-resistant textiles, was meta-aramid fibre, known under the trade name Nomex ® , produced by DuPont in 1967. Meta-aramid polymer, by the structure is the blend of m-phenylenediamine and dichloride of m-isophthalic acid, having excellent thermal and flame resistance properties which arise from their aromatic structure including high carbon/hydrogen (C:H) ratios and high content of aromatic double bonds.…”

“…9 This was followed by the production of para-aramid fibre in the 1970s, having highly oriented domains of polymer molecules and containing high crystalline structure as well as high glass transition temperature. 8,10 In composition and structure of inherently flame-retardant fabrics, these fibres are blended in order to optimise the protective properties, as well as comfort, durability and cost. Paraaramid fibres blended partners show properties of reducing the thermal shrinkage and are often blended with meta-aramids in order to offset the inherent thermal shrinkage of the meta-aramids.…”