Abstract
THE synthesis of poly(acid amides) (P&4) of high molecular weight (m.w.) is normally carried out is a polar solvent such as dimethylformamide, or in dimethyl sulphoxide, the barely soluble and easily hydrolysed dianhydride usually being added to the diamine solution. The reaction between the solid dianhydride particles and the diamine in solution, will take place in the diffusion range, under these conditions, i.e. there will be a gradual change of the dianhydride into solution while the PAA is formed. Where the process takes
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