Structure‐properties relationships in biaxially oriented polypropylene films

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Abstract
A series of biaxially oriented polypropylene films has been extensively investigated with respect to structural characterization and with regard to various end‐use properties. The relationships between properties and structural characteristics such as crystallinity content and molecular orientation in crystalline and non‐crystalline phases were compared with similar relationships in uniaxially oriented polypropylene films. Notable differences between uni‐ and biaxially oriented films, in particular with regard to non‐linear mechanical behavior (tenacity, impact strength, tear strength) could be explained, at least partly, in terms of structural characteristics (molecular orientation and mobility) related to the non‐crystalline phase.