Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps
Nowadays, the demand for surface functionalized plastics is constantly rising. To address this demand with an industry compatible solution, here a strategy is developed for producing hierarchical microstructures on polyethylene terephthalate (PET) by hot embossing using a stainless steel stamp. The...
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MDPI AG
2021-04-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/7/1756 |
| _version_ | 1797538946136145920 |
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| author | Felix Bouchard Marcos Soldera Robert Baumann Andrés Fabián Lasagni |
| author_facet | Felix Bouchard Marcos Soldera Robert Baumann Andrés Fabián Lasagni |
| author_sort | Felix Bouchard |
| collection | DOAJ |
| description | Nowadays, the demand for surface functionalized plastics is constantly rising. To address this demand with an industry compatible solution, here a strategy is developed for producing hierarchical microstructures on polyethylene terephthalate (PET) by hot embossing using a stainless steel stamp. The master was structured using three laser-based processing steps. First, a nanosecond-Direct Laser Writing (DLW) system was used to pattern dimples with a depth of up to 8 µm. Next, the surface was smoothed by a remelting process with a high-speed laser scanning at low laser fluence. In the third step, Direct Laser Interference Patterning (DLIP) was utilized using four interfering sub-beams to texture a hole-like substructure with a spatial period of 3.1 µm and a depth up to 2 µm. The produced stamp was used to imprint PET foils under controlled temperature and pressure. Optical confocal microscopy and scanning electron microscopy imaging showed that the hierarchical textures could be accurately transferred to the polymer. Finally, the wettability of the single- and multi-scaled textured PET surfaces was characterized with a drop shape analyzer, revealing that the highest water contact angles were reached for the hierarchical patterns. Particularly, this angle was increased from 77° on the untreated PET up to 105° for a hierarchical structure processed with a DLW spot distance of 60 µm and with 10 pulses for the DLIP treatment. |
| first_indexed | 2024-03-10T12:39:21Z |
| format | Article |
| id | doaj.art-252c09c11e2f4d6f80721ae337465d20 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T12:39:21Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-252c09c11e2f4d6f80721ae337465d202023-11-21T14:01:16ZengMDPI AGMaterials1996-19442021-04-01147175610.3390/ma14071756Hierarchical Microtextures Embossed on PET from Laser-Patterned StampsFelix Bouchard0Marcos Soldera1Robert Baumann2Andrés Fabián Lasagni3Institut für Fertigungstechnik, Technische Universität Dresden, George-Baehr-Str. 3c, 01069 Dresden, GermanyInstitut für Fertigungstechnik, Technische Universität Dresden, George-Baehr-Str. 3c, 01069 Dresden, GermanyInstitut für Fertigungstechnik, Technische Universität Dresden, George-Baehr-Str. 3c, 01069 Dresden, GermanyInstitut für Fertigungstechnik, Technische Universität Dresden, George-Baehr-Str. 3c, 01069 Dresden, GermanyNowadays, the demand for surface functionalized plastics is constantly rising. To address this demand with an industry compatible solution, here a strategy is developed for producing hierarchical microstructures on polyethylene terephthalate (PET) by hot embossing using a stainless steel stamp. The master was structured using three laser-based processing steps. First, a nanosecond-Direct Laser Writing (DLW) system was used to pattern dimples with a depth of up to 8 µm. Next, the surface was smoothed by a remelting process with a high-speed laser scanning at low laser fluence. In the third step, Direct Laser Interference Patterning (DLIP) was utilized using four interfering sub-beams to texture a hole-like substructure with a spatial period of 3.1 µm and a depth up to 2 µm. The produced stamp was used to imprint PET foils under controlled temperature and pressure. Optical confocal microscopy and scanning electron microscopy imaging showed that the hierarchical textures could be accurately transferred to the polymer. Finally, the wettability of the single- and multi-scaled textured PET surfaces was characterized with a drop shape analyzer, revealing that the highest water contact angles were reached for the hierarchical patterns. Particularly, this angle was increased from 77° on the untreated PET up to 105° for a hierarchical structure processed with a DLW spot distance of 60 µm and with 10 pulses for the DLIP treatment.https://www.mdpi.com/1996-1944/14/7/1756direct laser writingdirect laser interference patterninghot embossinghierarchical structuresstainless steelpolymer |
| spellingShingle | Felix Bouchard Marcos Soldera Robert Baumann Andrés Fabián Lasagni Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps Materials direct laser writing direct laser interference patterning hot embossing hierarchical structures stainless steel polymer |
| title | Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps |
| title_full | Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps |
| title_fullStr | Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps |
| title_full_unstemmed | Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps |
| title_short | Hierarchical Microtextures Embossed on PET from Laser-Patterned Stamps |
| title_sort | hierarchical microtextures embossed on pet from laser patterned stamps |
| topic | direct laser writing direct laser interference patterning hot embossing hierarchical structures stainless steel polymer |
| url | https://www.mdpi.com/1996-1944/14/7/1756 |
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