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박연금,임무산 한국섬유공학회 1983 한국섬유공학회지 Vol.20 No.5
평행판이 설치된 Rheometrics Dynamic Spectrometer를 사용하여 각진동수, 온도, 시간, 그리고 전단변형에 따라 폴리에틸렌 테레프탈레이트 용융물의 동적 유변학적 성질을 조사했다. 온도 29$0^{\circ}C$와 전단변형 15% 조건에서 복소점도는 각진동수 40 radians/sec 이하에서 각진동수에 상관없이 일정한 값을 유지하여 뉴턴유체의 거동을 나타내었지만 40radians/sec 이상에서는 각진동수의 증가에 따라 감소하는 비뉴턴유체의 거동을 나타내었다. tan$\delta$의 실험 결과치는 완화시간이 1.7$\times$10-3초 일 때 맥스웰의 점탄성 모형에서 계산 한 값과 상당히 잘 일치 했다. Andrade 혹은 Arrhenius식에서 활성화 에너지로 13.5kcal/mole을 택하고 277$^{\circ}C$에서의 복소점도 실험치와 이 식에서의 점도치가 일치 되도록 조절 할 때 실험 결과치는 온도 228$^{\circ}C$ 이하에서를 제외하고 이 식과 잘 일치했다. 주어진 각진동수, 온도, 그리고 전단변형에서 저장 탄정율, 손실 성율, 그리고 복소점도는 시간이 경과함에 따라 증가했고 tan$\delta$는 감소 했으며 이에대한 고찰을 피력했다. 주어진 온도와 각진동수에서 모든 유변학적 성질은 전단변형이 28 퍼센트 일 때까지 전단변형의 증가에 따라 거의 변화를 나타내지 않았다. The dynamic rheological properties of poly(ethylene terphthalate) melt were determined as functions of angular frequency, temperature, time, and shear starain, respectively. All measurements were made in Rheometrics Dynamic Spectrometer with oscillatory parallel plate. Under the conditions of 290$^{\circ}C$ and 15% shear strain the complex viscosity was independent of the angular frequency below 40 radians/sec, thus indicating Newtonian in behavior, but it decreased with increasing angular frequency above 40 radians/sec, indicating non-Newtonian. The experimental data of tan $\delta$ coincided fairly well with the data calculated with the Maxwell viscoelastic model when the relaxation time was 1.7${\times}$10-3sec. The complex viscosity followed the Andrade or Arrhenius equation except at low temperatures, i.e., below 228$^{\circ}C$ when the Andrade equation was matched to the experimental value at 277$^{\circ}C$ and the value of activation energy was 13.5 Kcal/mole. The interpretation of increase in storage modulus, loss modulus, and complex viscosity and decrease in tan$\delta$ with the lapse of time for a given frequency, temperature, and shear strain was discussed. All rheological properties showed no variations with shear strain up to 28 percentages for a given temperature and angular frequency.
接合型 二成分 纖維紡系에 있어서 다이 出口에서의 힘 現象
윤원식,김상용,임무산,김학묵 嶺南大學校 工業技術硏究所 1986 연구보고 Vol.14 No.1
An experimental result of the bending phenomenon at the die exit was compared with the theoretical result. The two result were same in the tendency of increasing bending angle with the melt viscosity ratio and the die swell ratio.
조현옥,김성중,임무산 한국섬유공학회 1992 한국섬유공학회지 Vol.29 No.1
Seven experimental poly(ethylene terephthalate) (PET) fibers have been spun and then drawn at different process conditions, i.e., spinning speed and draw ratio, in such a way that the fibers possess different long periods but retain the crystal structure. Wide angle X-ray diffraction, small angle X-ray scattering, and loss modulus measurements have been used to characterize the fine structure of the fibers. The influence of fine structure on the extensional fatigue behavior of the PET fibers has studied by subjecting them to 120~l8Orev/min repeating deformation at 10$^4$~ 10 5 cycles. In order to detect the molecular motion of PET concerned with the extensional fatigue, thermoluminescence(TL) experiments were performed at high temperature region(above room temperature). The high temperature TL intensity decreased with l0$^4$ cycle extension but increased with l05 cyclic extenxion. The extent of changein TL intensity was found to be a function of long period and loss modulus.