Abstract
An organic soluble benzophenon-containing polyimide (BCPI) was synthesized via solution polycondensation of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride with 2,3,5,6-tetramethyl-p-phenylenediamine. The dissolution characteristics were studied by using a dissolution apparatus. Experimental data showed that the normalized thickness of the gel layer (δ), the position of the rubbery/solvent interface S, and the position of the rubbery/glassy interface R were linear and proportional to the square root of the diffusion time at an early stage of dissolution process. As experimental time proceeded, dissolution became more apparent and the linear relationship would no longer exist. Mathematical models to describe the dissolution behavior of BCPI in N-methyl-2-pyrrolidone (NMP) were proposed.