Abstract
XRD, NMR, and DSC results indicate that both block poly(ethylene oxide-co-nylon 6) and poly(ethylene oxide-co-nylon 12) are separated, multiphase systems that include a well-defined polyamide crystalline phase, a polyamide amorphous phase, and a predominantly amorphous polyether phase. The DSC data suggest the existence of polyether-based crystallites in both cases. However, a polyether crystalline phase was not detected by XRD, indicating either that it is a minor component or that the crystallites are very poorly defined compared to the homopolymer. In addition, the NMR and XRD results reveal that the crystalline polyamide phase in both polymers adopts a structure (α or γ) similar to that found in the corresponding polyamide homopolymer
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