Abstract
Thin films of nylon-6 (N6), nylon-6,6 (N66), and their blends (N6/N66 = 70/30, 50/50, and 30/70) were prepared by casting from solution (1.0 wt%) in formic acid under ambient conditions. The dried films were melted at 260°C or 280°C and then isothermally crystallized at 200°C. Morphological observations and selected-area electron diffraction (SAED) by transmission electron microscopy (TEM) of the resulting films revealed the following results: All specimen films (N6/N66 = 100/0, 70/30, 50/50, 30/70, and 0/100) had fibrillar entities that were undoubtedly crystalline judging from SAED and dark-field (DF) imaging. Some of the fibrillar entities were constituents of a spherulite or a sheaflike structure (namely, an immature spherulite). To delete the “memory” of the structures of the N66 component that were formed in as-cast films, the films have to be melted at 280°C. As to isothermal crystallization of the blends at 200°C after melting at 280°C, it is postulated that the N66 component first starts to crystallize, and then the N6 one starts to crystallize afterward.
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