AI Article Synopsis
- The study focuses on enhancing the injection molding process to produce polymeric components with micro- and nanostructured surfaces, which is traditionally challenging due to low mold temperatures.
- A new system is used that quickly heats the mold surface while injecting the polymer and cools rapidly afterward, improving the accuracy of surface feature replication using a nickel insert with fine details.
- Results show that higher mold temperatures lead to better replication accuracy, with viscosity affecting micro- but not nanofeatures, highlighting that interfacial interactions are crucial at the nanoscale and that crystallinity also impacts the replication of these small features.
Article Abstract
The production by injection molding of polymeric components having micro- and nanometrical surfaces is a complex task. Generally, the accurate replication of micro- and nanometrical features on the polymeric surface during the injection-molding process is prevented by of the low mold temperature adopted to reduce cooling time. In this work, we adopt a system that allows fast heating of the cavity surface during the time the melt reaches the cavity, and fast cooling after heater deactivation. A nickel insert with micro- and nanofeatures in relief is located on the cavity surface. Replication accuracy is analyzed by Atomic Force Microscopy under different injection-molding conditions. Two grades of polylactic acid with different viscosity have been adopted. The results indicate that the higher the cavity surface temperature is, the higher the replication accuracy is. The viscosity has a significant effect only in the replication of the microfeatures, whereas its effect results are negligible in the replication of nanofeatures, thus suggesting that the interfacial phenomena are more important for replication at a nanometric scale. The evolution of the crystallinity degree on the surface also results in a key factor on the replication of nanofeatures.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6119903 | PMC |
| http://dx.doi.org/10.3390/ma11081442 | DOI Listing |
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