Under atmospheric pressure,a pre-polymerization process was employed to prepare PA56/6 copolymers with five different compositions using PA56 salt and CPL as reactants.The chemical structure of PA56/6 was characterized using FTIR,1H-NMR and 13C-NMR.The effects of different CPL contents on the thermal stability,crystalline structure,melting and crystallization temperatures,crystalline form,and mechanical properties of PA56/6 were investigated using TG,XRD,DSC,POM,and universal test machine.The results showed that PA56/6 exhibited thermal stability comparable to PA56 and mainly exhibited the γ-crystalline phase.With increasing CPL content,the crystallization and melting temperatures decreased,the crystallinity decreased,and the polymer crystalline morphology transformed from larger spherulites to smaller grains,resulting in improved impact resistance.Using a 50 L intermittent kettle,the PA56/6 polymerization scale-up test was performed,and the specimens were made by injection molding.In comparison to PA56,PA56/6(with 20％CPL content)exhibited a 47.6％increase in elongation at break and a 33.3％increase in notched impact strength,indicating an enhancement in toughness for PA56/6.
维普
万方数据