한국섬유공학회지 (Textile Science and Engineering)

  • 제57권3호
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  • Pages.125-132
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  • 2020
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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

양모 지방의 레올러지 물성 : 피부 관리 화장품의 주성분으로서의 역할

Rheological Properties of Wool Fat : Role as a Main Ingredient in Skin-Care Cosmetic Products

  • 박은경 (부산대학교 공과대학 유기소재시스템공학과) ;
  • 최근석 (부산대학교 공과대학 유기소재시스템공학과) ;
  • 송기원 (부산대학교 공과대학 유기소재시스템공학과)
  • Park, Eun-Kyoung (Department of Organic Material Science and Engineering, Pusan National University) ;
  • Choi, Geun-Seok (Department of Organic Material Science and Engineering, Pusan National University) ;
  • Song, Ki-Won (Department of Organic Material Science and Engineering, Pusan National University)
  • 투고 : 2020.04.28
  • 심사 : 2020.05.11
  • 발행 : 2020.06.30
⟨ 이전 논문 다음 논문 ⟩

초록

The principal objective of the present study has been to systematically investigate the rheological properties of wool fat as a main ingredient of skin-care cosmetic products. Using a strain-controlled rheometer, the steady shear flow properties of commercially available wool fat were measured over a wide range of shear rates, and the linear viscoelastic properties of the material in small amplitude oscillatory shear flow fields were measured over a broad range of angular frequencies. In addition, the temperature dependency of the linear viscoelastic behavior was investigated over a temperature range most relevant to usual human life. The main findings obtained from this study are summarized as follows : (1) Wool fat exhibits a finite magnitude of yield stress and a marked non-Newtonian shearthinning flow behavior. The appearance of a yield stress and a shear-thinning feature can be explained by the crystalline networks existing within the material. A yield stress is correlated with consistency whereas a shear-thinning viscosity is associated with spreadability. (2) The linear viscoelastic behavior of wool fat is dominated by an elastic nature rather than a viscous nature. This behavior can be interpreted by the orientation of hydrocarbon chains inside a monodomain. This linear viscoelastic feature could become a criterion to assess the storage stability of cosmetic products at rest or at very small deformations. (3) A modified form of the Cox-Merz rule provides a good ability to predict the relationship between steady shear flow properties (nonlinear behavior) and dynamic viscoelastic properties (linear behavior) for wool fat. (4) The storage modulus and loss modulus show a qualitatively similar tendency to sharply decrease with an increase in temperature. At a temperature range higher than 40℃, both of the two moduli exhibit a more pronounced temperature dependency while the difference between the two moduli becomes smaller. In the case of the storage modulus, an unexpected plateau region is observed over a temperature range between 25 and 30 ℃.

키워드

과제정보

This work was supported by a 2-year Research Grant of Pusan National University (Research Period : March 2019~February 2021).

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