Mechanical Properties and Processing of Polyethylene Films
Summary
Polyethylene films are integral to packaging, agricultural and medical sectors owing to a combination of high tensile strength, ductility and cost-effective manufacture. Their mechanical performance reflects a synergy between molecular architecture—branching density, molecular weight distribution and entanglement networks—and crystalline morphology. Processing methods such as blown film extrusion and machine-direction orientation impose extensional and shear flows that govern strain-induced crystallisation, lamellar orientation and fibrillation. Key parameters including blow-up ratio, take-up ratio, draw ratio and thermal profile influence film thickness, biaxial orientation and barrier properties. Optimised control of these variables enables production of films with enhanced modulus, tear resistance and dimensional stability, while supporting recyclability and circular-economy goals in diverse global applications.
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Mechanical Properties and Processing of Polyethylene Films publication trend
The graph below shows the total number of articles in mechanical properties and processing of polyethylene films across all publications each year (not limited to Nature Index journals).
Technical terms
Tensile strength: The maximum stress a film can withstand under uniaxial tension before failure.
Elongation at break: The percentage increase in film length at the point of rupture under tensile loading.
Tear resistance: The film’s ability to resist propagation of an initiated tear when subjected to a puncture or cut.
Crystallinity: The proportion of ordered, crystalline regions in a polymer that influence stiffness and barrier properties.
Molecular weight distribution: The range of polymer chain lengths in a sample, affecting flow behaviour and mechanical performance.
Film blowing: A process in which molten polymer is extruded through a circular die and inflated to form a thin tubular film.
Blow-up ratio: The ratio of bubble diameter to die diameter in film blowing, controlling film orientation and thickness.
Draw ratio: The ratio of final film length to original extrudate length during stretching, influencing molecular orientation and crystallinity.
References
- Comparative Analysis of the Effects of Incorporating Post-Industrial Recycled LLDPE and Post-Consumer PE in Films: Macrostructural and Microstructural Perspectives in the Packaging Industry. Polymers (2024).
- The interplay between macromolecular structure, rheology, processing condition, and morphology for (linear) low density polyethylenes in film blowing. Polymer (2024).
- Impact of molecular architecture and draw ratio on enhancement of targeted mechanical properties of machine direction oriented polyethylene films produced after blown film extrusion. Journal of Plastic Film & Sheeting (2024).
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