Abstract
The fast cooling of the melt in an injection moulding process for manufacturing polymer microparts can lead to a modified inner structure, resulting in minor mechanical properties. Furthermore, the ageing can be also dependent on the process-induced properties. The results indicate that especially physical ageing processes occur in parts with unpropitious inner properties. Chemical ageing processes seem to occur independently of the process conditions in microparts. Tensile tests indicate that a process-induced favoured morphology can reduce the ageing-based change of mechanical properties.
Highlights
The fast cooling of the melt in an injection moulding process for manufacturing polymer microparts can lead to a modified inner structure, resulting in minor mechanical properties
The results indicate that especially physical ageing processes occur in parts with unpropitious inner properties
Ageing of polymer microparts is dependent on the process inducing inner structure
Summary
Microparts and microsystems technology is reputed as a prospective key technology with an estimated annual growth rate of about 10% [1]. In a conventional injection moulding process, the mould surface temperature is far below the melt temperature This leads to a high cooling velocity and results in a frozen layer close to the mould surface [9] which affects the filling behaviour due to change in melt viscosity [10]. To counteract this effect, different strategies were developed and investigated to modify and optimize the process parameters. With increasing mould or melt temperature the emerging part morphology is favoured, affecting the resulting mechanical properties (e.g., tensile strength) of the part [19,20,21,22,23]. Polymer parts with smaller dimensions are more affected by ageing as parts with macroscopic dimensions [36]
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