Composition dependent miscibility in the crystalline state of polyamide 6 /polyamide 4,10 blends: From single to double crystalline blends

We studied the composition-dependent miscibility of polyamide 6 and biobased 4,10 (PA6/PA410) blends, as triggered by crystallization driven phase segregation. The blends were prepared extrusion in a wide composition range characterized X-ray diffraction (both in-situ ex-situ SAXS/WAXS), Differential Scanning Calorimetry (DSC), Polarized Light Optical Microscopy (PLOM) during non-isothermal crystallization. miscible amorphous state, demonstrated single Tg that follows Fox equation function composition. also considered to be melt, no evidence segregation was found SAXS or contrast microscopy melt. Remarkably, can crystalline state limited range. When only 10 20% PA6 present co-crystallization evidenced DSC WAXS exhibited PA410 rich phase. On other hand, 30% more added PA410, occurred progressively increased with content blends. Hence double are formed both phases. Clear presence either one two phases obtained temperature-dependent measurements employing DSC, PLOM, SAXS. Both PA6/PA410 good mechanical properties view excellent compatibility displayed line those following simple rule mixtures.