Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Dyeing Properties of Dichroic Organic Dye on Poly(vinyl alcohol) Film with a High Degree of Hydrolysis

고검화도 폴리비닐알콜 필름에서의 이색성 유기염료의 염착 특성

  • Jeon, Guk Jin (Department of Polymer Science and Engineering, Kumoh National Institute of Technology) ;
  • Park, Il Hyun (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
  • 전국진 (금오공과대학교 고분자공학과) ;
  • 박일현 (금오공과대학교 고분자공학과)
  • Received : 2013.08.01
  • Accepted : 2013.10.05
  • Published : 2013.10.31
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Abstract

Dyeing of a poly(vinyl alcohol) (PVA) film with a high degree hydrolysis (>98%) using Direct Black 22, a dichroic organic dye, was investigated under various conditions (dye concentration, salt ($Na_2SO_4$) concentration, and temperature). This process could correctly be analyzed using the Freundlich isotherm ($C_{film}=K_FC_{soln}{^{1/n}}$) based on the pore model. The Freundlich exponent 1/n appeared to be constant over a broad range of salt concentrations, but the Freundlich constant $K_F$ assumed the maximum value for $[Na_2SO_4]={\sim}0.010M$. However, this value was 10 times greater than that under the no-salt conditions. Analysis of the adsorption kinetics revealed that only the early stage of dyeing was followed second-order, with an activation energy of 50.2 kJ/mol. However, gradual deviation from the second-order occurred with an increase in the dyeing time. These results indicated that the surfaces of the inner pores in the PVA film are dyed through multilayer adsorption, which is accompanied by complicated kinetics.

Keywords

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