Abstract
The coagulation mechanism of 6 nylon-66 nylon blends obtained by dry-blending method, prepared by evaporation of the solvent from the formic acid solution of both polymers was investigated.The crystallinity of each component of freeze-dried blends, which were prepared by evaporation of the solvent under reduced pressure from frozen solution, decreased remarkably by the addition of other component. On the other hand, in dry blends prepared by very slow evaporation of the solvent, the 66 nylon component crystallized independently of the 6 nylon component, but the crystallization of 6 nylon component strongly interfered with 66 nylon component as the result of co-precipitation of both components.In the DSC curve of the dry blends obtained from aqueous formic acid solution, a new melting peak was found between the peaks of both components, However, it was considered to be one of the multiple melting peaks of 66 nylon component. This phenomenon was observed when the samples were prepared by slow sodificating process. 66 nylon component of the dry blends was observed to aggregate as dendritic crystals within large spherulites, and 6 nylon component filled up the crevices of dendritic crystals of 66 nylon.
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