• Textile Coloration and Finishing
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• v.8 no.3
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• pp.36-51
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• 1996

In order to investigate the degradation behavior of PET fabrics, sodium diethylene glycolate (SDEG)-diethylene glycol (DEG) solutions were prepared and PET fabrics were treated in the solution. The dissolution rate constant and apparent activation energy of the PET fabrics were calculated by Eyring's and Arrhenius's equation respectively and measured dyeing properties, moisture and antistatic properties. Then compared SDEG-treated fabrics with NaOH-treated. The results were as follows; 1. PET fabrics decreased their weight in SDEG-DEG solution, and the decreasing rate showed a linear relationship to the treating time at constant temperature and concentration of SDEG-DEG solution. 2. The dissolution rate constant showed a linear relationship to the concentration of SDEGDEG solution and an exponential relationship to treating temperature. 3. Apparent activation energy of dissolution was 23.45 kcal/mol. 4. The K/S values and the ΔL values of fabrics treated with SDEG-DEG solution are higher and lower respectively than fabrics treated with NaOH. 5. SDEG-DEG solution treatment improved fabric's moisture regain and it reached almost maximum at about 40% weight loss. 6. In the both reagent the light, wet and sublimation fastness of fabrics are similar. 7. SDEG-DEG solution gave more electrical discharge effect to the fabrics than that of NaOH. 8. NaOH treated PET microfiber have crater-like surface, while SDEG-DEG solution give bathochromic effect to the PET microfiber because which has wrinkles on the surface.

• Korean Journal of Food Science and Technology
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• v.30 no.4
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• pp.733-738
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• 1998

Tannic acid (TA), chlorogenic acid (GA) and caffeic acid (CA) as copigments were added in anthocyanin solutions (pH 3.0) to test their effects on the stability against temperatures, metal ions, and light. Absorbance of anthocyanins increased with the increase of copigment concentrations. Tannic acid showed the highest absorbance increase with bathochromic shift of 14 nm (from 514 nm to 528 nm). Copigmentation resulted in higher storage stability of anthocyanins for 21 days at room temperature $925^{\circ}C)$ but lower thermal stability at higher temperatures more than $70^{\circ}C. Addition of metal ions to TA caused the enhanced stability as well as increased absorbance of anthocyanins. Copigmentation also caused a significant increase of light stablilty of anthocyanins at room temperature, so that addition of TA showed 2.3 times showed photodegradation of anthocyanins under 20,000 lux-light dosage in pH 3.0 solution at $25^{\circ}C$.