Amphiphilic, thixotropic additives for extrusion-based 3D printing of silica-reinforced silicone
| Autor: | Alec C. Marmo, Bruce L. Tai, Aman Nigam, Denisse Ortiz-Acosta, Melissa A. Grunlan, Bryan Khai D. Ngo, Jakkrit Suriboot |
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| Rok vydání: | 2021 |
| Předmět: |
Filler (packaging)
Thixotropy Materials science Dimethyldichlorosilane 02 engineering and technology General Chemistry Dynamic mechanical analysis 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Biofouling chemistry.chemical_compound Silicone Chemical engineering chemistry Amphiphile Extrusion 0210 nano-technology |
| Zdroj: | Soft Matter. 17:4133-4142 |
| ISSN: | 1744-6848 1744-683X |
| DOI: | 10.1039/d1sm00288k |
| Popis: | The ability to utilize extrusion-based, direct ink write (DIW) 3D printing to create silica-reinforced silicones with complex structures could expand their utility in industrial and biomedical applications. Sylgard 184, a common Pt-cure silicone, lacks the thixotropic behavior necessary for effective printing and its hydrophobicity renders cured structures susceptible to biofouling. Herein, we evaluated the efficacy of various PEO-silane amphiphiles (PEO-SAs) as thixotropic and surface modifying additives in Sylgard 184. Eight amphiphilic PEO-SAs of varying architecture (e.g. linear, star, and graft), crosslinkability, and PEO content were evaluated. Modified formulations were also prepared with additional amounts of silica filler, both hexamethyldisilazane (HMDS)-treated and dimethyldichlorosilane (DiMeDi)-treated types. Numerous PEO-SA modified silicone formulations demonstrated effective water-driven surface hydrophilicity that was generally diminished with the addition of HMDS-treated silica filler. While increased yield stress was observed for PEO-SA modified silicones with added HMDS-treated filler, none achieved the initial target for 3D printing (>1000 Pa). Only the formulations containing the DiMeDi-treated filler (17.3 wt%) were able to surpass this value. These formulations were then tested for their thixotropic properties and all surpassed the targets for recovered storage modulus (G′) (>1000 Pa) and loss factor ( |
| Databáze: | OpenAIRE |
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