Oblikovanje pH odzivne poliamidne tkanine za dežni plašč

Stojkoski, Viktor (author), Kert, Mateja (mentor)

Kemična sestava deževnice lahko služi kot indikator za prebitek kislih onesnaževal v zraku. Povprečna vrednost pH deževnice znaša 5,6. V prisotnosti žveplovega dioksida in dušikovih oksidov, kot prekurzorjev kislega dežja, pade vrednost pH deževnice pod vrednost 5,6, kar je vrednost kislega dežja. Magistrsko delo obsega izdelavo halokromne tekstilije za oblikovanje funkcionalnega dežnega plašča, ki bo uporabnika informiral o prisotnosti onesnaževal v zraku s takojšnjo barvno spremembo. V raziskavi je bilo za barvanje poliamida 6 uporabljeno pHobčutljivo barvilo bromokrezol zeleno, kjer je sprememba barve vidna pod pH 3,6, ko se barvilo obarva rumeno in nad pH 5,4, ko se barvilo obarva modro. Pobarvana tkanina je bila nato apretirana z vodo in oljeodbojnim sredstvom. Barva in barvna sprememba pobarvanih vzorcev tkanin je bila spektrofotometrično ovrednotena z uporabo barvnega prostora CIELAB pred potopitvijo obarvanih vzorcev v pufrske raztopine različnih vrednosti pH in po njej. Barvne obstojnosti na drgnjenje, pranje in svetlobo ter vodo in oljeodbojnost obarvanih tkanin so bile določene v skladu z veljavnimi standardi SIST EN ISO. Ugotovljeno je bilo, da je na neapretirani pobarvani tkanini barvna sprememba reverzibilna in bolj zaznavna kot na apretirani pobarvani tkanini. Pobarvana poliamidna 6 tkanina ima dobre barvne obstojnosti na drgnjenje ter gospodinjsko in poklicno pranje, medtem ko je barvna obstojnost na svetlobi slaba. Kljub degradaciji barvila pod vplivom ksenonove sijalke ostajata neapretirani in apretirani pobarvani poliamidni 6 tkanini še vedno odzivni na spremembo vrednosti pH.

• Language: English
• Keywords: pH odzivno barvilo, bromokrezol zeleno, poliamid 6, vodo in oljeodbojnost, kisli dež.
• Work type: Master's thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2020
• PID: 20.500.12556/RUL-115953
• Publication date in RUL: 01.05.2020

Secondary language

• Language: Slovenian
• Title: Design of pH responsive polyamide fabric for raincoat

Abstract

The chemical composition of rainwater can serve as an indicator for the excess of acidifying air polluting substances. The pH value of rainwater in the presence of sulphur dioxide and nitrogen oxides, the precursors of acid rain, falls below pH 5.6, which is the average value of rainwater. In this thesis, we report on tailoring a halochromic textile for the design of a functional raincoat which informs the wearer about the presence of pollutants in the air by an immediate change of colour. For this purpose, the pH-sensitive Bromocresol Green dye, which performs a colour change below 3.6 (yellow) and above 5.4 (blue), was used to dye a polyamide 6 fabric. In addition, the dyed polyamide 6 fabric was treated with water and oil repellent finish. Colour and colour change before and after immersion of untreated and treated dyed samples in buffers solutions of different pH values were spectrophotometrically evaluated using CIELAB colour space. Colour fastness to rubbing, washing, light, and the water and oil repellency of dyed fabrics were determined according to valid SIST EN ISO standards. It was found that the untreated, dyed polyamide 6 fabric undergoes reversible colour change more quickly and more clearly than treated polyamide 6 fabric. The dyed polyamide 6 fabric had good colour fastness to rubbing, domestic and commercial laundering, whilst colour fastness to light is poor. Moreover, the dyed polyamide 6 fabric is pH responsive, despite degradation of dye under xenon light, regardless of whether it was after treated or not.

• Keywords: pH sensitive dyes, bromocresol green, polyamide 6, water and oil repellency, acid rain