시간 및 온도변화에 따른 폴리아크릴로니트릴/디메틸술폭시드 중합체 용액의 유변학적 특성 연구
Study on Rheological Characterization of Polyacrylonitrile/Dimethyl Sulfoxide Solution with Change of Storage Times and Temperatures
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초록
본 연구에서는 PAN 섬유용 폴리아크릴로니트릴(PAN)/디메틸술폭시드(DMSO) 용액의 보관시간 및 온도변화에 따른 구조적 및 유변학적 특성에 대해 고찰하였다. 결과로서, 모든 PAN/DMSO 용액은 온도 변화에 따라 매우 특징적인 유변학적 거동을 보였다. 중합체 용액은 온도가 40~70oC의 온도 범위까지 증가함에 따라 복합 점도가 증가하고 손실 계수(tanδ)가 감소함을 나타내었으며, 낮은 진동수에서 점도가 급격히 증가하는 것을 확인할 수 있었다. 이러한 결과는 저장 시간에 따라 중합체 용액내 물에 의한 분자간 수소 결합으로 겔 고분자 및 고밀도 겔 구조가 형성되었기 때문으로 판단된다.
Abstract
In this study, the structural and rheological characterizations of polyacrylonitrile(PAN)/dimethyl sulfoxide(DMSO) solutions for PAN fiber were investigated according to the change of storage times and temperatures. As a result, PAN/DMSO solutions exhibited a very characteristic rheological behavior with variation of temperature. The solutions showed an increase of complex viscosity and a decrease of loss tangent(tanδ) as temperature was increased over the temperature range of 40 and 70oC and it could be seen that the viscosity rapidly increased at low frequency. These results indicated that the gel polymer and denser gel structure were formed due to the intermolecular hydrogen bonding of water in the polymer solution depending on the storage time.
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