Influence Of Copolymerization Polyamide On Structure And Properties Of MCPA6Blends

With the anionic ring-opening polymerization of ε-caprolactam, the blendscomposed of ternarypolymerization nylon (PA6-66-1010) and monomer castingpolyamide6(MCPA6)were obtained. In the presence of PA666, the blends ofPA666/MCPA6were prepared, too. Another kind of PA6-66-1010/MCPAA6blendswas prepared via melt-mixing through a twin-screw extruder and the subsequentinjection molding. A serious of characterizations were conducted, including theanalyses of crystallization and melting behaviors using differential scanningcalorimetry (DSC); observation of morphology of fractured surface with scanningelectron microscope (SEM); measurement of glass transition through dynamicmechanical analysis (DMA); study the intermolecular interaction between the twocomponents by Fourier transform infrared spectrophotometer(FTIR).We study the effects to the blends with different contents of PA6-66-1010.Theresult suggests that the crystallizing point, the fusion temperature, and thecrystallinity of the blends decreased with the increase of PA6-66-1010. In addition,the blending system toughed by increasing the content of PA6-66-1010. Especially,the percentage of breaking-elongation of the bends is increased by7times whenPA6-66-1010content is10%. PA6-66-1010has significant effect on both percentageof breaking-elongation and toughness of the bends.We compared the blends of PA6-66-1010/MCPA6and PA666/MCPA6to researchthe effects to blends with different fillers. The results show us that compared to thePA666/MCPA6blends, in the infrared spectra, the-NH-vibration for thePA6-66-1010/MCPA6moved more waves to the higher wave number. In addition theglass transition temperature, crystallizing point, the fusion temperature and thecrystallinity of the PA6-66-1010/MCPA6blends were lower than the PA666/MCPA6; the former had better toughness. At the same time, we also compared the blendsprepared in different ways. The result suggests that, compared to the melt-mixingblends, in the infrared spectra the-NH-and C=O vibration for the in-situ blendsmoved more waves to the higher wave number. Besiders, the glass transitiontemperature, crystallizing point, the fusion temperature and the crystallinity of the insitu blends were lower than the melt-mixing, in addition, the former`s strength andtoughness were all superior to the later.Finally, with the pictures took by SEM for the stretching fracture surface andimpact fracture surface of blends, as well as the results of DSC, DMA, FTIR,XRD,we proposed a reasonable explanation for toughening mechanism of the blends.