• Studies on the Syndiotatic Poly(vinyl alcohol) Polarizing Film-Preparation of Low Molecular Weight Syndiotactic Poly(vinyl alcohol)/Iodine Complex Film and Its Characterization
  • Lyoo WS, Yeum JH, Choi JH, Ji BC, Noh TH, Yoon WJ, Cheong TS, Kim JP
  • 교대배열 폴리비닐알코올 편광필름에 관한 연구-저분자량 교대배열 폴리비닐알코올/요오드 복합체 필름의 제조와 특성 해석-
  • 류원석, 염정현, 최진현, 지병철, 노태환, 윤웅재, 정태식, 김재필
Abstract
A polymer/indone complex film was prepared using syndiotactic poly(vinyl alcohol) (s-PVA) with number-average degree fo polymerization of 900 and syndiotactic diad content of 63.1%. In comparison with atactic-PVA/indine films, degree of polarization of the s-PVA/iodine film was improved up to over 99% although a lower transmittance was obtained. By soaking in iodine/potassium iodide aqueous solution of a lower iodine concentration and subsequent drawing by 4 times, s-PVA/iodine film of a higher transmittance and degree of polarization was produced. The degree of iodine desorption of the s-PVA/iodine film in water were very low. The crystallinity and the d-spacing and crystal size of (100) plane inwith increasing soaking time, In consequence, s-PVA/iodine complex formaion took place mainly inside crystal region at the initial stage of soaking time, whereas it occurred otyside crystal region or physical adsorption of iodine dominated after sufficient soaking.

수평균 중합도 900 및 교대배열기 함량 63.1%의 교대배열 poly(vinyl alcohol) (s-PVA)을 사용하여 s-PVA/요오드계 편광필름을 제조하였다. 혼성배열 PVA/요오드계 필름ㅇ과 비교할 때 편광도는 저연신비에서도 99% 이상의 값을 가짐으로써 향상된 결과를 보였으나 투과도는 약간 저하되는 경향을 보였다. 따라서 침지액의 요오드 농도를 낮추고 4배의 연시비를 유지함으로써 우수한 투과도와 편광도를 가지는 필름을 제조할 수 있어TEk. 한편, s-PVA/요오드 필름의 열수하에서의 탈착은 현저히 억제되었다. 결정화도, (100)면의 결정크기 및 면간거리가 조금씩 감소하거나 더 이상 증가하지 않는 것으로부터 침지시간 초기에는 요오드가 주로 결정영역에서 복합체를 형성하고, 이후에는 주로 결정면 밖에서 복합체를 형성하거나 단순한 물리적인 흡착을 이루고 있음을 확인하였다.

Keywords: syndiotatic; polarization; s-PVA/iodine film; degree of solubility; desorption

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  • Polymer(Korea) 폴리머
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    ISSN 2234-8077(Online)
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This Article

  • 2000; 24(5): 713-720

    Published online Sep 25, 2000