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Light-based additive manufacturing of porous polymers

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  1. Tez No: 918007
  2. Yazar: NİHAN ŞENGÖKMEN ÖZSÖZ
  3. Danışmanlar: DR. FREDERİK CLAEYSSENS
  4. Tez Türü: Yüksek Lisans
  5. Konular: Belirtilmemiş.
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2019
  8. Dil: İngilizce
  9. Üniversite: The University of Sheffield
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 88

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Özet (Çeviri)

Additive manufacturing techniques that have popularity in various applications have different methods such as fused deposition modelling, direct ink writing, selective laser sintering, and stereolithography. Additionally, various printing inks or materials can be used in these techniques. This project focuses on light-based additive manufacturing of porous polymers which is significant for the following applications; tissue engineering, sound absorption, thermal insulation, energy absorption, and catalytic applications. In order to fabricate porous polymers, the best way to combine emulsion templating with stereolithography. The former provides microporosity whilst the letter allows the occurrence of macroporosity. By emulsion templating, high internal phase emulsions (HIPEs) are produced and then, this emulsion is used as ink for stereolithography. The photocurable emulsions contain an internal phase that is mainly water and a continuous phase which includes monomers, a crosslinker, a surfactant, and a photoinitiator. If the internal phase is higher than 74% it is named as HIPE. When the polymerisation of HIPEs via stereolithography polyHIPEs occur; and so highly interconnected porous scaffolds are obtained through the removal of water in HIPE. This study examines the 3D printing of HIPEs on commercial stereolithography set-up to investigate the utility of this technique to make multiscale porous structures for the mentioned applications. Additionally, parameters affecting the properties of the final product is analysed for microstereolithography set-up products. The porosity was retained during the printing layer-by-layer via the commercial 3D printer. Moreover, porosity depends on the amount of light absorber. It was observed that interconnectivity is related to internal phase volume, increasing water ratio enhances the occurrence of more interconnected structures. Finally, high printing speeds and powers caused a reduction in pore quality

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