Autonomic healing of a pinhole in polyethylene and photografted polyethylene-g-poly(hexyl methacrylate) films

摘要

The structural changes of polyethylene (PE) and photografted polyethylene-g-poly(hexyl methacrylate) (PE-g-PHMA) with the mechanical formation of pinholes were evaluated with differential scanning calorimetry, wide-angle X-ray scanning, and small-angle X-ray scanning. The crystallinity and the long period of the lamella increased with pricking under extremely high compression stress. The partial transformation of an orthorhombic crystal into a monoclinic one was also detected. The autonomic healing of pinholes in PE and PE-g-PHAIA was studied in detail. The degree of healing increased with an increase in the grafting ratio of poly(hexyl methacrylate) (PHMA). Three mechanisms for the healing were investigated and related to the molecular motions of PE and PHAM grafted chains, which were evaluated with dynamic mechanical analyses. (C) 2004 Wiley Periodicals, Inc.