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최중환,홍엄지,최란,홍선표,고준석,Choi, Joong Hwan,Hong, Umji,Choi, Ran,Hong, Sunpyo,Koh, Joonseok 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.4
Morinda citrifolia, commercially known as Noni, is a tree that grows widely throughout the Pacific, and is recognized as one of the most significant sources of traditional medicines among Pacific Island societies. The bark and the roots of the tree contain red and yellow pigments respectively, which are both used in the manufacture of dyes. Dyes from Noni are being used traditionally, to color clothing and fabrics. In this study, dyeing properties of Noni root extracts on silk fabrics at various pH conditions were investigated.
단분산성 고분자 용융체의 완화시간분포의 해석적인 근사계산법
최중환,Choi, Joong Hwan 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.4
The relaxation time spectrum is a versatile parameter to calculate various polymer viscoelastic properties, such as the relaxation modulus (G(t)), dynamic modulus (G'(${\omega}$)) and loss modulus (G"(${\omega}$)). However, it cannot be measured experimentally. This study calculated the relaxation time spectrum using a calculation method based on Fusso-Kirkwood's theoretical research and using the empirical loss modulus formula. The calculated relaxation time spectrum and Rouse's model could describe the viscoelastic behavior of monodisperse polystyrene successfully. This analytical approximation of the relaxation time spectrum differed from experimental data in the intermediate region between the reputation and Rouse region. This may have resulted from a limitation of the molecular theory in the Rouse region.
동적 크리프 컴플라이언스를 이용한 완화시간분포의 근사계산법
최중환,Choi, Joong Hwan 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.5
The relaxation time spectrum is a very effective parameter for transforming material functions even with a limited amount of data. The spectrum also helps in understanding the relaxation behavior of polymers at the molecular scale. In this study, a relaxation time spectrum based on Marin-Graessley's dynamic compliance model was calculated using Fuosso-Kirkwood's complex analysis. The resulting model could successfully describe the viscoelastic behavior of mono-disperse polystyrene. However, it was clear that a more effective numerical analysis method was needed to obtain more accurate parameter values.