Article
  • Immiscible Polybenzimidazole/Polyimides Blends
  • Choe S, Ahn TK
  • 불균일계 폴리벤지미다졸/폴리이미드 블렌드
  • 최순자, 안태광
Abstract
DSC and Fourier-Transform Infrared(FTIR) spectroscopic studies in blends of poly(2,2(m-phenylene)-5,5''-bibenzimidazole) (PRI) with two polyimides, 6F-3,3''-ODA and 6F-DDSO2, are presented. 6F-3,3''-ODA is formed from 2,2''-bis(3,4-dicarboxyphenyl)-1,1,1,3,3,3,-hexafluoro propane and 4-aminophenyl ether while 6F-DDSO2 is formed from 2,2''-bis(3,4-dicarboxyphenyl)-1,1,1,3,3,3,-hexa-fluoro-propane and 4-aminophenyl sulfone. The PBI/6F-3,3''-ODA and PBI/6F-DDSO2 blends are immiscible ; the evidence is in the form of optically opaque films, two distinct Tg''s corresponding to that of the two homopolymers in DSC and no significant frequency shifts in the peaks corresponding to the N-H in PBI and the C=0 in polyimides in FTIR spectra. The immiscibility of the present blend systems may be rationalized on the basis of steric hindrance of the bulky-CF3 group present in two polyimides. The results in both systems are compared with those observed in previous miscible systems ; the possible role of chemical interactions for immiscibility is discussed.

Poly(2,2(m-phenylene)-5,5''-bibenzimidazole) (PBI)와 두 폴리이미드(PI) 6F-3,3''-ODA와 6F-DDSO2 블렌드에 대한 DSC와 Fourier-Transform Infrared (FTIR) 分光學的 側面이 硏究되었다. 6F-3,3''-ODA는 2,2''-bis(3,4-dicarboxyphenyl)-1,1,1,3,3,3-hexafluoro propane과 4-aminophenyl ether로 製造되며, 6F-DDSO2는 2,2''-bis(3,4-dicarboxyphenyl)-1,1,1,3,3,3,-hexafluoro propane과 4-amino-phenyl sulfone으로 부터 製造되었다. PBI/6F-3,3''-ODA와 PBI/6F-DDSO2 블렌드들은 不均一하다 ; 그 證據로는 光學的으로 不透明한 形態이며, DSC에서 두 單重合體들에 相應되는 두개의 유리轉移溫度를 갖고, 그리고 FTIR 스팩트럼에서 PBI의 N-H와 PI의 C=0에 相應하는 피이크들에서 顯著한 周波數 變化가 없는 것이다. 이 블렌드系들에서의 不均一性은 두 폴리이미드들에 있는 벌크한 -CF3기의 空間障碍를 根據로 說明될 수 있다. 두 블렌드系들에서의 結果는 均一系에서 觀察된 以前의 硏究結果들과 比較된다 ; 즉 不均一性에 대한 化學的 相互作用들의 可能한 役割이 檢討되었다.

References
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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1990; 14(2): 115-121

    Published online Apr 25, 1990