| 초록 |
Polyimides were prepared from 6FDA dianhydride and four diamines, 4, 4’ODA, 3, 4’ODA, 1, 4PDA, BAPP by using the method of chemical imidization. In comparison, the corresponding polyimide thin films by the method of thermal imidization were also prepared. The structure, solubility, molecular weight, and thermal properties of the obtained polyimide thin films were examined with FT-IR, viscometer, DSC, and TGA. The characteristic properties in soluble polyimide powders and thin films by using the method of chemical imidization, which includes dielectric properties, thermal properties, molecular weight, and water sorption, were compared with that prepared by using the method of thermal imidization. The control of molecular weight and crosslink density is easily achieved by the ratio of introduced acetylene monomer, thus enabling the control of thermal and physical properties.
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