Study On The Compatibility Of Poly (Ethylene Terephthalate)/Polyamide Blends

Compatibility of the blend, crystallization and thermal stability of PET/PA1010, PET/PA6 and PET/PA66 blends were studied by DSC, SEM, X-ray, POM, TGA and other testing means. The results show that:The compatibility of PET/PA blend has been improved with the PA components content increasing in the PET/PA blends; a small amount of PA has the role of heterogeneous nucleation on PET and it accelerate the PET crystallization so that it made crystallization of PET more perfect. PET crystallization changed imperfect gradually with the PA content increasing. While PET played a obstruction role on the crystallization of PA; The decomposition rate of PET/PA blends increased with the PA content increasing. Compatibility, crystallization and thermal stability were studied on different components of the same quality PET/PA blends, the analysis showed that:Compatibility relationship was PET/PA66> PET/PA6> PET/PA1010; PA66 had the least affect on PET crystallization. PA1010 had the largest affect on PET crystallization and crystallization rate.PA6 was in center; The thermal stability of PET/PA66 blend was the best. The thermal stability of PET/PA1010 blend was the worst and PET/PA6 blend was in the center.PET/PA blends blended with 5min and PET/PA blends blended with 30min were studied by FTIR testing. The results show that:ester-amide exchange reaction degree increased with the blending time increasing. Ester-amide exchange reaction is proportional to the degree of mixing time.Compatibility, crystallization and thermal stability of different components of the same quality PET/PA blends blended with 5min and 30min were studied. The results show that:the compatibility of PET/PA blend has been greatly improved with the increasing of esters-amide exchange reaction extent; block copolymer hindered the PET/PA blends crystallization, which was produced in esters-amide exchange reaction. It made crystallization imperfect, decreased the crystallization temperature and slowed down the crystallization rate. The thermal decomposition rate of the same mass fraction of PET/ PA blends have increased with ester-amide exchange reaction increasing. Compatibility, crystallization and thermal stability analysis of different components of the same mass fraction of the PET/PA blends blended with 30min showed that:the compatibility of PET/PA66 blends is the best with the ester-amide exchange reaction increasing, compatibility of PET/PA1010 blends is the worst and compatibility of PET/PA6 blends is in the center. PA1010 still had the most obvious affect in the crystallization of PET. The decomposition rate of PET/PA1010 blends was still the highest.