Synthesis of copoly(ester-amide)s with α, w-di(3-aminopropyl) oligotetrahydrofuran
Polimery 1999, No 2, 115
Novel random copoly(ester-amide)s (PAE) were obtained in a two-step transesterification and polycondensation process carried out in the melt. The PAEs were obtained by using an oligoether with amine end-groups [α, w-di(3-aminopropyl)oligotetrahydrofuran] with three different molecular weights (M = 750 g/mol; M = 1100 g/mol; M = 2100 g/mol). Oligo(butylenes terephthalate) (PBT) was used as an oligo-ester sequence in PAEs. Thermal and mechanical properties of PAEs were examined by differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA) and other standard physical methods. DSC disclosed two Ts temperatures in PAEs (one in the low and the other in the high temperature range, Table 1, Figs. 1—3), attributed to two phases existing in PAEs. The constant Ts -value in the low-temperature range indicates that, regardless of the composition of the polymer, the polyether phase has a constant composition (Fig. 4). DMTA confirmed the hetero-phase structure of PAEs and the associated elastoplastic properties of PAEs (Figs. 7—12). The extensive relative elongation at break, the high elasticity, and the low hardness of PAEs containing 50—60 wt. % of oligoether-diamine are characteristic for elastomers of M = 2100, (Table 2, samples 11 and 12).
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