Synthesis and characterization of adipic acid/polyethylene glycol/poly(ethylene terephthalate) copolyester fiber

Abstract

A series of aliphatic/aromatic copolyesters that contained different amounts of aliphatic segments, constructed from adipic acid (AA, 0∼0.117 mole ratios), were synthesized. The structure of each copolymer was confirmed by 1H nuclear magnetic resonance. The molecular weight was determined directly by gel permeation chromatography and indirectly by the intrinsic viscosity. The results of thermal tests revealed that both melting temperature ( T m) and crystallization temperature ( T c) decreased as the aliphatic segment content increased. The glass transition temperatures ( T g) that were determined by dynamic mechanical analysis followed the same trend as did T m. Moreover, the thermal stability, determined from thermogravimetric analysis, declined as polyethylene glycol (PEG) and AA were incorporated into the poly(ethylene terephthalate) (PET) main chains. All of the polymers that were synthesized herein were spun into fibers and then physically characterized. The tenacity of the fibers decreased as the soft-segment content increased. The crystalline structures, revealed by wide-angle X-ray scattering, indicated that the crystallinity decreased with increasing AA content because of the reduction of regularity of the PET chains. Most importantly, the tests that were carried out on the knitted fabric demonstrated that the moisture regain and cool feeling ( qmax) of the copolymer fabrics were better than those of fabrics that comprised neat PET chains, owing to the incorporation of soft PEG segments. Finally, the copolymer fabric exhibited better hydrolysis and enzymatic degradation than did neat PET fabric.

Study on yellowing mechanism and inhibiting technology based on amide salts modified polyester

“…Mechanical properties: Textile fibers need to possess a specific ability to resist external forces when the fibers are damaged during processing and use. Moreover, the breaking elongation of textile fibers was generally controlled at about 25-30% due to the higher elongation providing poor stability and easy deformation, 26 and the lower breaking elongation will affect the wearing comfort and wearability. Thus, in view of the appropriate breaking elongation, excellent breaking tenacity was given an important practical significance.…”

Fiber Spinning from Cellulose Solutions in Imidazolium Ionic Liquids: Effects of Natural Antioxidants on Molecular Weight, Dope Discoloration, and Yellowing Behavior

“…The wastewater from olive oil production (lyophilizate) and the standardized green tea extract (lyophilizate) both show a largely constant, known composition of antioxidants. General: [19-21], mechanism: [22], in polymer processing: [23][24][25][26], in ionic liquids: [27,28], in fiber spinning: [29][30][31][32][33][34][35] Ascorbyl palmitate (2) 137-66-6 414.53 E 304 General: [36], mechanism: [37,38], transport: [39,40], safety: [41], stability: [42], in fibers: [43,44] α As antioxidants, we employed the compounds shown in Scheme 1. Table 2 lists relevant compound data and pertinent literature.…”

Synthesis and Structural Characterization of Sequential Structure and Crystallization Properties for Hydrophilic Modified Polyester

“…Many studies and practices have proved that introduction of additional monomer into PET molecular chain changes the hydrophilic properties of PET fibers potentially by introducing hydrophilic groups [10,11] or reducing the molecular regularity and crystallinity of PET [5,12]. Wang, Qiong et al, [13] used terephthalic acid (PTA), ethylene glycol (EG) and dihydroxyethyl isophthalate-5-sulfonate (SIPE) as the third monomer, and the different content polyols as the fourth monomer, synthesizing a series of hydrophilic copolyester, and the fiber moisture regain was generally only 0.6-0.8%.…”

“…Polyethylene terephthalate (PET), which is known for its excellent mechanical properties and chemical resistance, consisting of high tenacity, excellent dimensional stability and good heat resistance, have been widely commercialized for many years in the textile industry [ 1 , 2 , 3 ]. However, its hygroscopicity is poor and the fiber moisture regain is only about 0.4%, due to its high crystallinity, compact amorphous structure and shorting of active hydrophilic groups [ 4 , 5 ]. In addition, owing to the shortage of cotton resource and the excess capacity of PET fiber industry, the hydrophilic polyester fibers have become the research trend of modified polyester in the textile field [ 6 , 7 , 8 , 9 ].…”