Article
  • Conformational Characteristics of Poly(diphenylether sulfone) Determined in Mixed Solvents under Theta- Condition
  • Park YH, Lee DC
  • 혼합용매계를 이용한 Theta-Condition에서 Poly(diphenylether sulfone)의 입체적 분자크기
  • 박영훈, 이동주
Abstract
The conformational characteristics of the polymeric chain under unperturbed state is studied for the poly(diphenylether sulfone)-mixed solvent system. The polymer, supplied by the ICI, was purified and fractionated by the successive reprecipitational fractionation. Each fraction of the polymer sample was molecular characterized by GPC and viscometry. Two systems of theta-mixture. DMF-MeOH at 25℃ and DMF-toluene at 30℃, were determined by the cloud point titration method. The values of K obtained from the DMF-toluene and DMF-MeOH systems under theta conditions were 0.112±0.002 and 0.124±0.0023 ml mo11/2g-3/2, respectively. Since the latter was found to confirm best with the average value deduced from various graphical procedures. the value 0.124±0.0023 was used for the establishiment of the relationship between the unperturbed chain dimension of the polymer and molar mass, and it results as:2>1/2=0.0792×Mw1/2(nm) The value 0.0792 was appeared as larger than isotactic polystyrene and PMMA, and comparable with cellulose trinitrate. A simplified rotational isomeric state approach and a model calculation revealed that the major contributor to the overall geometrical feature is trans-trans which separated intermittently with trans-gauch and gauch-gauch conformer. All the experimental results and theoretical calculations prove conclusively that the shape of the chain molecule under consideration is the type of highly extended coil.

혼합 용매계를 이용하여 poly(diphenylether sulfone)의 입체적인 분사형태를 규명하였다. ICI사 제품인 시료를 구입하여 정제 및 연속식 재침전법으로 분별하였고 각 분별 시료에 대하여 GPC와 용액 점성도 측정으고 분자특성을 결정하였다. Cloud point 적정법을 이용하여 DMF-MeOH(25℃) 및 DMF-toluene(30℃) 혼합용매계의 theta 조성을 결정하였다. 각 theta 조건 하에서 얻은 K 값은 DMF-toluene계에서 0.112±0.002m1 mo11/2g-3/2, DMF-MeOH계에서 0.124±0.0023m1 mo11/2g-3/2이었다. DMF-MeOH계에서 얻은 K 값이 여러 종류의 간접방법에 의하여 구한 K 평균값과 일치하였으므로, 이 값으로 부터 다음과 같은 비섭동분자 크기와 분자량과의 관계식을 얻었다. 2>1/2=0.0792×Mw1/2(nm). 여기서 얻은 값 0.0792는 isotactic polystyrene이나 isotactic PMMA보다는 큰 값을 나타내었고, cellulose trinitrate와는 유사한 경향을 보였다. 간소화한 rotationary isomeric state분석 및 화학구조 model을 이용한 계산 결과는 시료 중합체 연쇄의 기하학적 형태가 주로 tracts-trans 구조이며, tracts-gauch 및 gauch-gauch 형태가 간헐적으로 섞여 있을 가능성이 큰 것으로 해석되었다. 모든 실험적 결과 및 이론적 계산 결과는 주어진 중합체 시료의 입체적인 분자 형태가 크게 확장된 coil 형태인 것으로 해석하게 하였다.

Keywords:

  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1988; 12(8): 749-756

    Published online Dec 25, 1988

  • 10.7317/pk.
  • Received on Nov 30, -0001
  • Revised on Nov 30, -0001
  • Accepted on Nov 30, -0001

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