Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
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Rheological Characterization of the Gelation Behavior of PVA Solutions in DMSO Containing BA

붕산을 첨가한 폴리비닐알콜/디메틸술폭시드 용액의 겔화 거동에 관한 유변학적 고찰

  • Lee, Eun Jeoung (Department of Organic and Nano Engineering, Hanyang University) ;
  • Kim, Dong Jun (EP Material Development Center, LG Chem Ltd.) ;
  • Chae, Dong Wook (Department of Textile Engineering, Kyungpook National University) ;
  • Kim, Byoung Chul (Department of Organic and Nano Engineering, Hanyang University)
  • 이은정 (한양대학교 유기나노공학과) ;
  • 김동준 (LG화학 EP 소재개발센터) ;
  • 채동욱 (경북대학교 섬유공학과) ;
  • 김병철 (한양대학교 유기나노공학과)
  • Received : 2018.04.02
  • Accepted : 2018.05.18
  • Published : 2018.06.30
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Abstract

The gelation behavior of poly(vinyl alcohol) (PVA) solutions in dimethyl sulfoxide (DMSO) containing boric acid (BA, $H_3BO_3$) under shear stress was rheologically investigated in terms of temperature and molecular weight of PVA. Time-dependent rheological properties of the solutions were analyzed to determine the effects of stress on the gelation mechanism. The solutions of low weight-average molecular weight ($M_w=31,000-50,000$) PVA showed more noticeable temperature-dependent viscosity changes than those of high weight-average molecular weight ($M_w=165,000-186,000$) PVA. The viscosity increase caused by stress indicated that the formation of the gel structure was promoted by stress. In time sweep experiments, all the PVA solutions showed stress-dependent rheological responses except for the high $M_w$ PVA solutions at $30^{\circ}C$. The viscosities of the solutions remained constant over the observed shearing time, indicating the formation of an irreversible gel. The effects of stress history were reconfirmed by the results of frequency sweep experiments. Antecedent shearing gave rise to many different time-dependent rheological responses. At $60^{\circ}C$, both low and high $M_w$ PVA solutions had loss tangent values (tan ${\delta}$) less than 1. Furthermore, the formation of gel structures increased the relaxation time (${\lambda}$) by up to 10 s.

Keywords

References

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