한국섬유공학회지 (Textile Science and Engineering)

  • 제52권3호
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  • Pages.172-184
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  • 2015
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  • 1225-1089(pISSN)
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  • 2288-6419(eISSN)
한국섬유공학회 (The Korean Fiber Society)
권호 표지
DOI QR코드

DOI QR Code

점탄성 고분자 액체의 정상유동함수와 과도적 유동함수의 상관관계 연구: Gleissle 밀러 관계식들의 실험적 검증 및 이론적 고찰

Relationships between Steady and Transient Flow Functions for Viscoelastic Polymer Liquids: Experimental and Theoretical Examination of the Gleissle Mirror Relations

  • 곽윤정 (부산대학교 공과대학 유기소재시스템공학과) ;
  • 안혜진 (부산대학교 공과대학 유기소재시스템공학과) ;
  • 송기원 (부산대학교 공과대학 유기소재시스템공학과)
  • Kwak, Yun-Jeong (Department of Organic Material Science and Engineering, Pusan National University) ;
  • Ahn, Hye-Jin (Department of Organic Material Science and Engineering, Pusan National University) ;
  • Song, Ki-Won (Department of Organic Material Science and Engineering, Pusan National University)
  • 투고 : 2015.04.21
  • 심사 : 2015.06.01
  • 발행 : 2015.06.30
⟨ 이전 논문 다음 논문 ⟩

초록

The objective of this study is to systematically investigate the relationships between steady flow functions and transient flow functions for viscoelastic polymer liquids. Using a strain-controlled rheometer (Advanced Rheometric Expansion System (ARES)), the steady shear flow properties and the transient shear flow properties of concentrated poly(ethylene oxide) (PEO) solutions have been measured over a wide range of shear rates and times. The validity of the three forms of the Gleissle mirror relations was examined by comparing them with the experimentally obtained results. In addition, the effect of nonlinearity on the applicability of these Gleissle mirror relations was discussed from a theoretical view-point by introducing the concept of a nonlinear strain measure. The main findings obtained from this study can be summarized as follows: (1) A nonlinear strain measure is decreased with an increase in strain magnitude, after reaching the maximum value at small strain range. This behavior is quite different from the theoretical prediction to satisfy the conditions of the Gleissle mirror relations. (2) The first mirror relation describing the equivalence between steady shear flow viscosity and shear stress growth coefficient is valid over a wide range of shear rates and is hardly affected by the nonlinearity of polymer solutions. (3) The second mirror relation expressing the equivalence between first normal stress coefficient and first normal stress growth coefficient is also applicable over a wide range of shear rates. This relation is, however, significantly influenced by the degree of nonlinearity (i.e., shape of a nonlinear strain measure) of polymer solutions. (4) The third mirror relation can be regarded as a very useful empirical model to predict the first normal stress coefficient from steady shear flow viscosity data, provided that an appropriate value of a shift factor is given.

키워드

과제정보

연구 과제 주관 기관 : 부산대학교

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