Morphology and thermomechanical properties of well-defined polyethylene-graft-poly(n-butyl acrylate) prepared by atom transfer radical polymerization

摘要

The morphology and thermomechanical properties of well-defined polyethylene-graft-poly(n-butyl acrylate) (PE-g-PBA) copolymers prepared via atom transfer radical polymerization wen investigated.Differential scanning calorimetry (DSC),small angle X-ray scattering (SAXS),wide angle X-ray scattering (WAXS),dynamic mechanical measurement and large deformation tensile tests were performed on the graft copolymers and the results were compared with the behavior of the polyethylene macroinitiator.The existence of both crystalline polyethylene segments and amorphous poly(n-butyl acrylate) segments in the copolymers leads to microphast separation and unique thermomechanical behavior.Strong micro-phase separation was observed by DSC and X-ray diffraction studies.Correlation of morphology and thermomechanical properties was also studied using dynamic mechanical measurement and large deformation tensile tests.