Polymer Microchannel and Micromold Surface Polishing for Rapid, Low-Quantity Polydimethylsiloxane and Thermoplastic Microfluidic Device Fabrication
| Autor: | Zheng Kun Wu, Chia Wen Tsao |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Thermoplastic
Fabrication Materials science Polymers and Plastics Abrasion (mechanical) polymer polishing Polishing 02 engineering and technology 01 natural sciences Article lcsh:QD241-441 chemistry.chemical_compound Machining lcsh:Organic chemistry polymer microfabrication micromilling Surface roughness polymer microfluidics microchannel PDMS casting Composite material chemistry.chemical_classification Microchannel Polydimethylsiloxane 010401 analytical chemistry micromold General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry 0210 nano-technology thermoplastic hot embossing |
| Zdroj: | Polymers Polymers, Vol 12, Iss 2574, p 2574 (2020) Volume 12 Issue 11 |
| ISSN: | 2073-4360 |
| Popis: | Polymer-based micromolding has been proposed as an alternative to SU-8 micromolding for microfluidic chip fabrication. However, surface defects such as milling marks may result in rough microchannels and micromolds, limiting microfluidic device performance. Therefore, we use chemical and mechanical methods for polishing polymer microchannels and micromolds. In addition, we evaluated their performance in terms of removing the machining (milling) marks on polymer microchannel and micromold surfaces. For chemical polishing, we use solvent evaporation to polish the sample surfaces. For mechanical polishing, wool felt polishing bits with an abrasive agent were employed to polish the sample surfaces. Chemical polishing reduced surface roughness from 0.38 &mu m (0 min, after milling) to 0.13 &mu m after 6 min of evaporation time. Mechanical polishing reduced surface roughness from 0.38 to 0.165 &mu m (optimal pressing length: 0.3 mm). As polishing causes abrasion, we evaluated sample geometry loss after polishing. Mechanically and chemically polished micromolds had optimal micromold distortion percentages of 1.01% ± 0.76% and 1.10% ± 0.80%, respectively. Compared to chemical polishing, mechanical polishing could better maintain the geometric integrity since it is locally polished by computer numerical control (CNC) miller. Using these surface polishing methods with optimized parameters, polymer micromolds and microchannels can be rapidly produced for polydimethylsiloxane (PDMS) casting and thermoplastic hot embossing. In addition, low-quantity (15 times) polymer microchannel replication is demonstrated in this paper. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |