Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Miscibility and Specific Intermolecular Interaction Strength of PBl/Pl Blends Depending on Polyimide Structures

폴리이미드의 구조에 따른 방향족 PBI/PI 블렌드의 상용성 및 상호작용의 세기

  • Ahn, Tae-Kwang (Dept. of Ind. & Eng. Chemistry, Hyejeon Junior College)
  • 안태광 (혜전전문대학 공업화학과)
  • Received : 1997.09.22
  • Accepted : 1998.02.23
  • Published : 1998.04.10
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Abstract

Four kinds of polyamicacids(PAAs) were prepared by the condensation reaction of four diamines with different linkages, 3,3'-diaminodiphenyl sulfone(3,3'-$DDSO_2$), 4,4'-diaminodiphenyl sulfone(4,4'-$DDSO_2$), 4,4'-methylene dianiline(4,4'-MDA) and 4,4'-oxydianiline(4,4'-ODA), and dianhydride, 3,3', 4,4'-benzophenone tetracarboxylic dianhydride (BTDA) using the solvent, dimethylacetamide(DMAc). These four PAAs were blended with poly[2,2-(m-phenylene)-5,5'-bibenzimidazole](PBI) from the solution blending. Then called as Blend-I, II, III, and IV, respectively. Cast films or precipitated powders of the PBI/PAA blends were cured at a higher temperature than expected Tg to transform into PBI/PIs blends. Miscibility, specific intermolecular interaction for miscibility and their relative strength as a function of polyimide chemical structure with different four diamines in the PBI/PI systems were investigated. Four blends used in this study were all miscible, and the specific intermolecular interactions existing in these blends was thought to be the hydrogen bonding between the N-H of PBI and the C=O of PIs. The hydrogen bonding in the blends were shown to be stronger in the Blend-III and Blend-IV than Blend-I and II. It is speculated that the differences of hydrogen bonding strength of PBI/PI blends are dependent upon chemical structures of PIs, that is, PIs consisting of $SO_2$ group have a weaker hydrogen bonding strength than those of O or $CH_2$ group because the former has a larger spacer than the latter.

네 종류의 폴리아믹산(PPA)은 서로 다른 구조의 디아민들인 3,3'-diaminodiphenyl sulfone(3,3'-$DDSO_2$), 4,4'-diarrinodiphenyl sulfone(4,4'-$DDSO_2$), 4,4'-methylene dianiline(4,4'-MDA) 및 4,4'-oxydianiline(4,4'-ODA)와 디안하이드라이드인 3,3', 4,4'-benzophenone tetracarboxylic dianhydride (BTDA)를 용매인 DMAc를 이용하여 합성되었다. 이들의 폴리아믹산(PAA)을 이용하여 poly[2,2-(m-phenylene)-5,5'-bibenzimidazole](PBI)와 용액 블렌딩하여 Blend-I, II, III, 그리고 IV로 칭하였으며, 이에 대한 시료를 필름이나 분말로 제조한 PBI/PAA 시스템을 예상된 $T_g$보다 높은 온도에서 열경화시켜 PBI/PI 블렌드로 전환시킨후 PI 합성시 사용된 디아민의 분자구조 변화에 따른 블렌드의 상용성과 그 상호작용의 상대적인 세기를 살폈다. 이로부터 본 연구에서 이용된 네 개의 블렌드들은 상용성을 보였으며, 이들 상용성을 가져다주는 상호작용의 세기는 Blend-III와 Blend-IV가 Blend-I와 Blend-II보다 큼을 보였다. 이와 같이 블렌드에 사용된 PI의 구조변화에 따라 상호작용이 다른 것은 PI합성시에 사용된 디아민의 구조에서 페닐링 사이에 존재하는 linkage인 O나 $CH_2$보다는 $SO_2$가 존재할 때 블렌드를 이루는 두 고분자사이의 상호작용인 수소결합력을 약화시키는 spacer로 작용하였다고 판단된다.

Keywords

References

  1. Engineering thermoplastics F. A. King;J. J. King
  2. Polyimides v.1;2 K. L. Mittal(Ed.)
  3. NASA TM-87650 report A. K. St. Clair;T. L. St. Clair;W. S. Slemp;K. S. Ezzell
  4. Polyimides: Material, Chemistry and Characterization J. L. Hedric;J.W. Labadie;T. D. Palmer;T. P. Russell;C. Feger(ed.)
  5. Encyclopedia of Polymer Science and Technology v.11 Polybenzimidazole H. H. Levine;F. H. Mark(ed.);G. G. Norman(ed.);M. B. Norber(ed.)
  6. Polymer Bull. I. Leung;D. W. Williams;F. E. Karasz;W. J. MacKnight
  7. Macromol v.21 G. Guerra;S. Choe;D. J. Williams;F. E. Karasz;W. J. MacKnight
  8. Polymer Commun v.29 S. Stankovic;G. Guerra;D. J. Williams;F. E. Karasz;W. J. MacKnight
  9. J. Polym. Sci, Polym. Phys. Ed. v.26 G. Guerra;D. J. Williams;F. E. Karasz;W. J. MacKnight
  10. Multiphase Macromolecular Systems v.6 Contemporary Topics in Polym Science S. Choe;F. E. Karasz;W. J. MacKnight;B.M. Cullbertson(ed.)
  11. Polyimides ; Material, Chemistry and Characterization S. Choe;W. J. MacKnight;F. E. Karasz;C. Feger(ed.)
  12. Polmer(Korea) v.16 S. K. Kim;J. H. Jung;H. S. Kim;S. Choe
  13. J. Macromol. Sci., Rev. Macromol. Chem. v.C16 M. M. Coleman;P. C. Painter
  14. Thermally Stable Polymers P. E. Cassidy
  15. J. Polym. Sci., Polym. Lett. Ed. v.18 S. P. Ting;E. M. Pearce;T. K. Kwei
  16. J. Polym. Sci. Polym. Lett. Ed. v.22 T. K. Kwei
  17. J. Appl. Chem. v.2 M. Gordon;J. S. Taylor
  18. J. Polym. Sci., Polym. Phys. Ed. v.20 G. Belorgey;R. E. Prud'homme
  19. Macromolecules v.24 J. F. Masson;R. S. J. Manley
  20. Polymer(Korea) v.14 S. Choe;T. K Ahn
  21. Macromolecules v.30;11 T. K. Ahn;M-J Kim;S. Choe
  22. Polmer(Korea) v.18 J. H. Jung;J. M. Hwang;H. J. Choi;S. Choe