Abstract
Low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE)-blown films differ significantly in the ratio between machine and transverse direction tear resistances. In this paper, the relationship between crystalline morphology and the differences in film tear anisotropy is investigated. The crystalline morphology and its orientation are probed using microscopy and infrared spectroscopy. Significant differences in crystalline morphology are observed: LDPE develops a row-nucleated structure, while a spherulite-like superstructure is observed for LLDPE. These structural differences are shown to translate into different ratios of machine and transverse direction tear strengths.
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