Study On The Blends Of Poly (Vinyl Chloride) With Nylon-6

On the basis of surveying of the relative literature about the modification of PVC, this paper raised that PA6 was modified first in order to decrease the melting point of PA6, then blending the PA6 of low melting point and PVC to enhance the properties of PVC and making PVC become engineering materials.In this paper the PA6 of modification (ePA6) was prepared by melting extrusion graft method in two-screwed extruder, the blending process of PVC/ePA6, micromorphology and properties of blends were studied, experimental results indicated that tensile strength of PVC/ePA6 blends was improved slightly, but impact strength decreased drastically, blends showed brittle fracture. Then the PA6 of modification (sPA6) was prepared through solution graft, PVC/sPA6 blends was prepared with sPA6 and PVC, micromorphology and properties of sPA6, blends were studied with DSC, IR, etc, results indicated that the melting point of sPA6 was 187℃, graft reaction happened between PA6 and SMA, the mechanical properties of PVC/sPA6 blends were increased, tensile strength increased from 40 MPa to 70 MPa, as well as impact strength from 45 kJ/m2 to 67.3 kJ/m2, which showed sPA6 could improve the properties of PVC better.In this paper micro-power PA6(uPA6) was manufactured by JKS microsmasher, micromorphology of PA6 particle and microcrystalline structure changes were emphatically studied in shear force too. Results indicated crystal structure was damaged by milling, which induces the melting point of PA6 decreases from 215℃ to 175℃ through SEM, XRD and DSC. In this paper the blending process of PVC/uPA6, micromorphology and properties of blends were emphatically studied either through SEM, XRD, DSC and DMTA, experimental results indicated that the mechanical properties of PVC/uPA6 blends were increased, tensile strength increased from 40 MPa to 87.7 MPa, as well as impact strength from 45 kJ/m2 to 95kJ/m2, which showed uPA6 could improve the properties of PVC and enhance the mechanical properties. SEM photos indicated SMA induced uPA6 dispersion in PVC, XRD and DSC proved PVC and PA6 informed commoncrystal, DMTA indicated SMA was favorable compatibilization.