Abstract
AbstractIsotropic unannealed and annealed melt‐pressed and quenched samples of segmented multiblock poly(ether‐ester‐amide)s based on polyamide‐6 and poly(ethylene glycol)s (PEGs) of molecular weights 400 and 1000 with various hard/soft segment weight ratios were investigated. The effect of composition, segment length and annealing temperature on the crystal structure was studied by differential scanning calorimetry, wide‐angle and small‐angle X‐ray scattering. In addition to the γ‐phase, one of the unannealed samples having relatively long hard and soft segments exhibits a high amount of α‐phase. This is assumed to be due to the high flexibility of the PEG segments, linking the polyamide blocks thus enhancing their mobility. The lack of hydrogen bonds between the PEG segments facilitates crystallization of the polyamide segments in the more perfect α‐modification, which is the most pronounced in the above mentioned sample. Part of the α‐phase transforms into the α‐phase upon annealing in all copolymer samples studied, similarly to polyamide‐6.
Published Version
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