Three ‐dimensional microstructure characterisation of thermoplastic polyolefin blends

Summary The size, shape and distribution of different phases in thermoplastic polyolefin (TPO) blends and composites are critical to the properties of the materials, but can be difficult to characterise. Here we report the combination of heavy metal staining and focused ion beam – scanning electron microscopy (FIB‐SEM) to reveal the three‐dimensional (3D) structure of an elastomer‐modified poly(propylene) and a talc filled elastomer‐modified poly(propylene). High‐quality, high‐resolution serial images were collected and the 3D structures were characterised quantitatively. Lay description Thermoplastic polyolefin polymer blends consist of a poly(propylene) main phase and a dispersed phase of rubber and mineral filler.  These blends are used to produce automotive interior parts such as instrument panels.  The rubber, or elastomer phase, is present as a separate phase in the poly(propylene) to allow the plastic part to fail at cold temperatures without shattering into shards that might result in injuries.  Talc as the mineral filler is used to add stiffness to the part that may be lost when rubber toughening or at high temperatures.  The size, shape and distribution of different phases in thermoplastic polyolefin (TPO) blends and composites are critical to the properties of the materials, but can be difficult to characterise. Here we report the combination of heavy metal staining and focused ion beam – scanning electron microscopy (FIB‐SEM) to be able to s...
Source: Journal of Microscopy - Category: Laboratory Medicine Authors: Tags: Original Article Source Type: research