THE INFLUENCE OF MOULD TEMPERATURE AND POLYMER STRUCURE ON THE MECHANICAL AND THERMAL PROPERTIES OF METALLOCENE CATALYSED LLDPEs

摘要

A number of metallocene and conventional LLDPEs, with different material properties, were injection moulded over four different mould temperatures. An assessment of the effect of cooling rate and polymer properties on the mechanical performance of the specimens was conducted to establish any significant correlations. Rheological studies of the materials under high shear rates experienced in injection moulding, was performed to determine flow characteristics of the materials. Differential scanning calorimetry (DSC) and dynamic mechanical thermal Analysis (DMTA) were used to study the influence of the comonomer type and degree of branching on the properties of the materials.