TY - JOUR ID - 81782 TI - A Comparative Study on the Environmental Friendly Bleaching Processes of Poly(lactic acid) Substrate: Application of Ultraviolet/O3/H2O2 System JO - Progress in Color, Colorants and Coatings JA - PCCC LA - en SN - 2008-2134 AU - FATTAHI, F.S. AD - Department of Textile Engineering, Isfahan University of Technology, Isfahan, Iran. Y1 - 2022 PY - 2022 VL - 15 IS - 2 SP - 143 EP - 156 KW - Poly(lactic acid) KW - Bleaching KW - Ultraviolet/O3 KW - Whiteness index KW - Eco-friendly DO - 10.30509/pccc.2021.166821.1114 N2 - Recently, there has been an increasing interest towards the finishing of textiles (fibers, yarns, fabrics and nonwovens) using eco-friendly technology, which can achieve a wide range of functional properties and environmental benefits. This study is related to a modern eco-friendly bleaching technology that relies on Ultraviolet/O3 radiation of poly(lactic acid) fabric through simple technique. The effects of Ultraviolet/O3 radiation along with the pretreatments with distilled water, hydrogen peroxide, and hydrogen peroxide/sodium silicate solutions on the bleaching of the poly(lactic acid) fabrics were examined using UV-Visible and reflectance spectral method and the results were compared with that of virgin untreated samples. Ultraviolet/O3 bleaching routes were screened to obtain desired whiteness index (WI), tint factor (Tw), lightness/darkness (L*), redness/greenness (a*), yellowness/ blueness (b*), chroma (c*) and hue (h˚) of the bleached poly(lactic acid) fabrics. The optimal properties of the bleached poly(lactic acid) knitted fabric could be obtained at Ultraviolet/O3 irradiation for 80 min on the fabrics which pre-impregnated in a hydrogen peroxide solution with a wet pick up of 70 %, pressure of 1.1 bar and speed of 2 m/min. (Ultraviolet/O3/H2O2 bleaching system). The Ultraviolet/O3/H2O2 bleached fabric showed the best colorimetric properties (WI: 87.7, : -0.1, L*:94.227, a*:-0.106, b*:0.294, c*:0.2512, h˚: 98.6551). Moreover, the reflectance of this sample has increased significantly in the range of 400-450 nm which leads to a glossy withe shade on the fibers. The SEM images presented that after Ultraviolet/O3/H2O2 bleaching process, some fractures with nano scale size (about 130 nm) are formed on the poly(lactic acid) fabric surface. The ATR-IR spectrum of Ultraviolet/O3/H2O2 bleached poly(lactic acid) fibers displays more intense C–C–O absorption bands (1161 cm-1).  UR - https://pccc.icrc.ac.ir/article_81782.html L1 - https://pccc.icrc.ac.ir/article_81782_4c4f5f7a0bf4f18b444bdf11919fc4bd.pdf ER -