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등방성 핏치의 용융 방사시 연신거동

Extensional Behavior of Isotropic Pitch During the Melt Spinning

HWAHAK KONGHAK, August 1989, 27(4), 389-395(7), NONE
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Abstract

핏치의 연신거동을 규명하기 위하여 연신점도를 새로운 방법으로 측정하였다. 새로이 젯된 연신력 측정 방법은 허용 오차 3.6%이내에서 신뢰성이 검증되었으며, 핏치 방사시 실측한 장력은 순수 연신에 의한 유변학적 힘임을 밝혀내었다. 또한 핏치의 연신거동을 점탄성 이론 모델식에 의해 계산된 값과 실험값을 비교 검토한 결과, 핏치의 연신점도는 연산율에 무관하고 전단점도의 세배가 되는 거동을 보임으로써 등방성 핏치의 방사성은 탄성 효과보다 점성효과에 의존함을 알 수 있었고, 아울러 점탄성 이론 모델식으로 계산한 연신점도는 relaxation time이 0에 접근할 때 0.6% 오차범위 내에서 실험값과 잘 일치함을 확인 할 수 있었다.
A newly developed method for the measurement of extensional viscosity was introduced to in-vestigate the extensional behavior of pitch during melt spinning. The confidence of this method was confirmed with the 3.6% of tolerance limit. The theoretical equation based on the viscoelastic model to calculate the extensional viscosity was proposed and its results were compared with experimental data. The spinnabilily of the isotropic pitch would be depended more viscous rather than elastic effect sinces the extensional viscosity found was of pitch independent of drawing ratio. During the melt spinning of pitch, measured force was rhelogical force by the extension. Therefore, innertia, gravity, air drag force was negligible.

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