• 한국염색가공학회지
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• 제8권3호
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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.

• 한국식품과학회지
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• 제30권4호
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• pp.733-738
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• 1998

Copigment로서 tannic aicd, caffeic acid, chlorogenic acid를 선택하여 유색미 안토시아닌의 색변화 특성 및 온도, 금속이온, 빛에 대한 안정성 변화를 조사하였다. 안토시아닌과 copigment 농도(M)비율을 1:1, 1:5, 1:10, 1:20과 1:40으로 조정하여 copigmentation 효과를 조사한 결과, copigments농도가 높을수록 농색화 효과가 높았으며, tannic acid를 첨가한 실험군이 가장 높은 농색화 효과를 나타내었다. $25^{\circ}C$에서 21일간 저장시에도 tannic acid의 농색화 효과는 지속적으로 유지되어 대조군에 비해 높은 안정성을 보여주었다. 고온에서는 copigment 첨가군의 반감기가 대조군의 반감기보다 감소하여 열에 대하여 오히려 더 불안정한 것으로 나타났다. Tannic acid와 금속이온을 함께 첨가한 경우에는 금속이온에 의한 농색화와 함께 copigment에 의한 농색화도 동시에 일어나 안정화 효과가 높아졌다. Copigmentation에 의하여 빛에 의한 안토시아닌의 분해속도가 크게 감소하여 빛에 대한 안정화 효과가 관찰되었다.