A dual binder concept for 3D printing ink: Triggered polymerization for rapid stiffening and carbonation for final strength
Additive manufacturing or 3D printing of polymeric materials is facilitated by sharp fluid-to-solid transition mechanisms. In contrast to polymeric materials, controlling the fluid-to-solid transition of suspensions based on reactive inorganic binders like cement remains challenging.Here, we present...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-02-01
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| Series: | Materials & Design |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525000188 |
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| Summary: | Additive manufacturing or 3D printing of polymeric materials is facilitated by sharp fluid-to-solid transition mechanisms. In contrast to polymeric materials, controlling the fluid-to-solid transition of suspensions based on reactive inorganic binders like cement remains challenging.Here, we present a dual binder suspension with precise control over the fluid-to-solid transition. We combine an organic binder system based on free radical polymerization of acrylic acid with an inorganic binder system based on the carbonation of calcium hydroxide. Once initiated, the polymerization of the organic binder forms a crosslinked polymer network, leading to a rapid fluid-to-solid transition of the material. The onset of polymerization is achieved with a thermal initiator (2,2'-azobis[2-(2-imidazolin-2-yl)propan]dihydrochloride) and could be adjusted in a temperature range of Image 1 as determined by differential scanning calorimetry (DSC).The maximum stiffening rate of Image 2 and maximum storage modulus of Image 3 are obtained by a rheometer using small-angle oscillatory shear (SAOS) experiments. Cubic samples are prepared using microwave irradiation to reach a compressive green body strength of Image 4 in Image 5. The following carbonation hardening of Image 6 leads to a final compressive strength of Image 7 at a porosity of Image 8. |
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| ISSN: | 0264-1275 |