Effects of sodium hydroxide and calcium hydroxide on polyester fabrics

Abstract

The results of a comparison between the effects of sodium hydroxide and calcium hydroxide on poly(ethylene terephthalate) fabrics are presented. Calcium hydroxide can produce weight-loss effects similar to an aqueous solution of sodium hydroxide. The effects of some treatment variables on weight loss, fiber diameter, bending rigidity, and strength of yarns taken from fabrics are examined. The results are explained in terms of current views of polyester alkaline hydrolysis.

In situ synthesis of nano silver on polyester using NaOH/Nano TiO2

“…A smooth uniform surface without any pits can be seen on untreated fabric in Figure 3(a); however, the fiber surface became pitted with holes as reported by others. 2,48 A few pits on the fiber surface can be observed on the fabric treated with low concentration of sodium hydroxide. 2,48 However, presence of silver nanoparticle on the polyester fabric can be confirmed with Figure 3(b,c).…”

“…2,48 A few pits on the fiber surface can be observed on the fabric treated with low concentration of sodium hydroxide. 2,48 However, presence of silver nanoparticle on the polyester fabric can be confirmed with Figure 3(b,c). This is an evidence for succeeding the proposed method of producing ethylene glycol as reducing agent for reduction of Ag þ to Ag 0 nanoparticles smaller than 100 nm.…”

“…Prolonged treatment time with increased sodium hydroxide concentration leads to the higher WL%. 48 Additionally, WL% of the fabrics treated with NaOH and cetyl trimethyl ammonium bromide (CTAB) (samples S3, S5, S7, and S8) were higher than fabrics treated without CTAB. CTAB as a cationic surfactant increases the hydrolysis reaction rate due to the ability of long-chain molecules to transfer hydroxide ions into the polyester phase.…”

“…The induction effect or coverage of negative charges on the hydrolyzed polyester facilitates the next attack of hydroxyl anions. 48,49 Fourier Transform Infrared Spectroscopy All of the compounds with covalent bond, organic and mineral, absorb different frequency of electromagnetic radiation in IR region. One of the major applications of FTIR spectroscopy is recognizing functional group of compounds.…”

“…47 It was further demonstrated that the weight loss of PET fabric could be used as a means of improving their aesthetic properties, 2 as weight loss from 10% to 20% resulted in producing lightweight PET fabrics with silk like properties and imparting hydrophilic properties. 48 The bending rigidity of all the treated samples is presented in Table II. The bending rigidity of nonalkali-treated sample was 32.49 lNm that was reduced to 17.12 lNm with alkali hydrolysis for sample S1.…”