Highly Thermal‐Resistant and Biodegradable Textile Sizes from Glycols Modified Soy Proteins for Remediation of Textile Effluents

Abstract

Poly(vinyl alcohol) (PVA) sizes are widely used in textile industry due to their excellent sizing properties on synthetic fibers and their blends. However, PVA contains non‐biodegradable chemicals and is a major contributor to environmental pollution related to the textile industry. To overcome this problem, an environmental‐benign and highly thermal‐resistant yarn coating is fabricated from soy proteins, an agricultural byproduct. The soy proteins are chemically modified by glycols having varying chain lengths and number of hydroxyl groups. Compared with the physically modified soy proteins and their sized yarns, coating made from the soy proteins esterified by 1,4‐butanediol show 91.38% increment in work of rupture at 120 °C and cotton/polyester (65/35) yarns sized by 1,4‐butanediol esterified soy protein sizes have 39.91% decrease in coefficient of friction. In addition, 1,4‐butanediol esterified soy sizes have a five‐day biochemical oxygen demand/chemical oxygen demand of 0.476, indicating that the chemically modified soy sizes have high biodegradability in activated sludge. Successful utilization of modified soy sizes can promote large‐quantity applications of soy byproducts, impelling high value addition to agricultural byproducts and sustainability of textile industry.

Mechanically Robust Flexible Polyurethane Foams Formulated with Polyols Comprising Soybean Protein

“…As shown in Schemes S3 and S4 in the Supporting Information, sulfoxide chloride first forms sulfite chloride intermediates with alcohols from which −OSOCl can be easily dissociated, resulting in nucleophilic substitution reactions of carbon positive ions with free carboxyl groups to produce esters . As displayed in Figure a, 1 H NMR of ethylene glycol shows δ at 3.59 ppm, whereas the respective signals emerge at 4.33 ppm (ddt, J = 8.8, 6.7, 3.4 Hz, 2H) and 3.86–3.72 ppm (m, 2H) for the modified SP after purification, demonstrating the successful esterification . Moreover, GPC analysis is conducted on esterified SP (ESP).…”

“…23 As displayed in Figure 2a, 1 H NMR of ethylene glycol shows δ at 3.59 ppm, whereas the respective signals emerge at 4.33 ppm (ddt, J = 8.8, 6.7, 3.4 Hz, 2H) and 3.86−3.72 ppm (m, 2H) for the modified SP after purification, demonstrating the successful esterification. 24 Moreover, GPC analysis is conducted on esterified SP (ESP).…”

Reactive Compatibilization of Poly(Butylene Succinate)/Soy Protein Isolate Bio-Composites By Peroxide And Diacrylate Via Melt Blending

“…As a byproduct of soybean oil-extraction, soy protein (SP) has attracted considerable attention because of its renewability, biodegradability, abundance and low cost. [10] Soy flour (SF), soy protein concentrate (SPC) and soy protein isolate (SPI) are three grades of SP, containing ca. 50%, 70% and 90% protein, respectively.…”