Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
권호 표지

Investigation of Thermal Imidization Kinetics and Viscosity Depression of Polyamic Acids

폴리아믹산의 열적이미드화 거동 및 고유점도변화 연구

  • Published : 1997.09.01

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Abstract

Polyamic acid precursors of high performance BTDA/MDA and PMDA/ODA were synthesized, and their thermal imidizations were investigated isothermally and non-isothermally by thermogravimetry. All the polyamic acids revealed a two-step imidization behavior, fast imidization at early stage and slow imidization at later stage. The onset temperature of imidization and Tg of the polyamic acids were determined using TGA, and thermal imidization parameters were investigated. Tg of the BTDA/MDA based polyamic acid was 105.8 $^{\circ}C$, and that of the PMDA/ODA based polyamic acid was 122.6 $^{\circ}C$. Intrinsic viscosity depression of polyamic acids with storage time was measured, and its dependence on the polymerization solvent was also investigated.

Keywords

References

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