Study on the absorption of ester polyols toward poly(ethylene terephthalate) fabrics and their application on the hydrophilic finishing of poly(ethylene terephthalate) fabrics

Autor: CHIEN-CHUNG CHENG, 陳見忠
Rok vydání: 2003
Druh dokumentu: 學位論文 ; thesis
Popis: 92
In this study 18 different polyols of polyester type were polymerized with dimethyl terephthalate (DMT), ethyl glycol (EG), and PEG by varying the mole ratio between DMT and EG and the molecular weight of PEG. Among these 18 products, some have a single benzene ring or double benzene ring in their molecular structures as the basic structure, and the benzene rings attached to a PEG moiety on only one end or both ends, or attached to a PEG and an EG moiety on each ends. The properties of the aqueous solution of the synthetic products, the solution''s surface tension and its contact angle with PET fabrics were measured, the hydrophilic-lipophilic balance (HLB) values of these polyols were also calculated, the adsorptivity between polyol and PET were determined, the adsorption behavior and the adsorption kinetics of different ester types polyol toward polyethylene terephthalate（PET）fibers was studied; in addition to, the effects of pH and neutral salts on the adsorption behavior and its effect on the hydrophilic property of the PET fabrics; finally, the polyols effect on the hydrophilic property and dyeing effect of the PET fabrics with addition polyol were studied. The results showed that all the synthesized and tested polyols structurally belonging to the single benzene ring series (whether PT, PTE, or PTP series) and a double benzene ring system with PEG attached on both ends (i.e. the PTETP series) fit nicely to the dual sorption mode of a combination of Henry type and Langmuir type. However, the other double benzene ring series, either with only PEG on one end (PTET series) or with a PEG and an EG moiety each separately attached on the two ends (PTETE series), display a Freundlich type sorption. Furthermore, it was found that the HLB value of polyols, and the disposition of the PEG moiety in the structure of polyols are also quite important in effecting the absorption parameters. In addition, the effects of pH and neutral salts on the adsorption of PET fiber with four kinds of polyethylene glycol terephthalate condensated from DMT and PEG. The surface properties and, the contact angle of polyols toward PET fiber, and its parameter were also discussed. The pH of the solution or the adding of neutral salt in the polyol solution largely affected the contact angle of polyols toward PET fibers as well as the surface tension. A lower pH of the polyol solution or adding neutral salts in the solution show a decrease surface tension, a decrease contact angle, that resulted in a better adsorption between polyol and polyethylene terephthalate fibers. The adsorption parameter for all the polyol solutions has a good proportional relation. The lower pH and a higher valence of adding neutral salt in the solution show excellent for the adsorption parameter. Further, the adsorption kinetics of different ester types polyol toward polyethylene terephthalate（PET）fibers was studied We found that the adsorption for all polyols showed a two-step adsorption phenomenon. The lower pH and the addition of neutral salts had a positive effect on absorption activation energy for polyols toward PET fibers. Another, in the hydrophilic durability of the treated fabrics, the results showed that the hydrophilicity as well as its laundering durability of the treated PET fabrics with different types of polyester polyol is double benzene ring series better than single benzene ring series, the lower pH and the addition of neutral salts had a positive effect on hydrophilicity and laundering durability. Finally, dyeing effect of the PET fabrics with addition polyol can upgrade the dyeing and hydrophilicity. The good add condition was when the solution was heated to 130℃ for 30mins and stop heated to 90℃.
Databáze: Networked Digital Library of Theses & Dissertations
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