Mechano‐Plastic Pyrolysis of Dynamic Covalent Polymer Network toward Hierarchical 3D Ceramics

Zheng, Ning; Hou, Jingjing; Zhao, Hangbo; Wu, Jingjun; Luo, Yingwu; Bai, Hao; Li, Jinghua; Zhao, Qian; Xie, Tao

doi:10.1002/adma.201807326

Cited by 48 publications

(44 citation statements)

References 30 publications

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“…All the above mechanical results reveal that the studied PDMA–silica hydrogel is a plastic hydrogel without apparent elastic recovery as being deformed. Iso‐strain–stress relaxation experiments [ 48 ] were further conducted to study the relationship between stress dissipation and temperature. As shown in Figure 2h, it is obvious that a higher temperature is prone to promote faster stress relaxation as well as smaller residual stress.…”

Section: Resultsmentioning

confidence: 99%

Hybrid Materials from Ultrahigh‐Inorganic‐Content Mineral Plastic Hydrogels: Arbitrarily Shapeable, Strong, and Tough

Zhang

Sun

et al. 2020

Adv Funct Materials

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Natural mineralized structural materials such as nacre and bone possess a unique hierarchical structure comprising both hard and soft phases, which can achieve the perfect balance between mechanical strength and shape controllability. Nevertheless, it remains a great challenge to control the complex and predesigned shapes of artificial organic-inorganic hybrid materials at ambient conditions. Inspired by the plasticity of polymer-induced liquid precursor phases that can penetrate and solidify in porous organic frameworks for biomineral formation, here a mineral plastic hydrogel is shown with ultrahigh silica content (≈95 wt%) that can be similarly hybridized into a porous delignified wood scaffold, and the resultant composite hydrogels can be manually made into arbitrary shapes. Subsequent air drying well preserves the designed shapes and produces fire-retardant, ultrastrong, and tough structural organic-inorganic hybrids. The proposed mineral plastic hydrogel strategy opens an easy and eco-friendly way for fabricating bioinspired structural materials that compromise both precise shape control and high mechanical strength.

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Section: Resultsmentioning

confidence: 99%

Hybrid Materials from Ultrahigh‐Inorganic‐Content Mineral Plastic Hydrogels: Arbitrarily Shapeable, Strong, and Tough

Zhang

Sun

et al. 2020

Adv Funct Materials

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“…By incorporating dynamic covalent bonds into epoxy thermoset, the topology structure can be rearranged under high temperature. Dynamic covalent network materials, combining the advantages of both cross‐linked and non‐crosslinked polymers, have been studied extensively all over the world . Dynamic covalent networks can rearrange their topology without depolymerization under certain conditions .…”

Section: Introductionmentioning

confidence: 99%

Reprocessable and Shape Memory Thermosetting Epoxy Resins Based on Silyl Ether Equilibration

Liu

Jiang

Zhao

et al. 2019

Macro Chemistry & Physics

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“…3D architecture control in functional devices has opened up unprecedented opportunities beyond those offered by their 2D counterparts . Among various options, 3D printing stands out in their freedom to manipulate geometric shapes in an almost unlimited fashion .…”

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confidence: 99%

Rapid Open‐Air Digital Light 3D Printing of Thermoplastic Polymer

et al. 2019

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printing is, however, limited by various factors, with printing speed and material versatility being the most decisive. From the standpoint of printing speed, layerwise printing by digital light processing (DLP) offers significant inherent advantage over point-wise printing by most other methods such as fused deposition modeling (FDM) and stereolithography (SLA). [20] Further innovations on DLP such as continuous building in the z-dimension allow achieving a printing speed far exceeding any other methods. [21][22][23] Recent attempt on direct forming 3D object in a volumetric fashion forgoes even the layer-wise printing, but the technique has yet to evolve into the mainstream. [24,25] Generally, DLP employs light curable liquid resins. Upon digital light exposure, the resin cross-links and forms a thermoset polymer that ensures its separation from the surrounding liquid precursors. This rapid liquid-solid separation is the key enabling characteristic for DLP. Although cross-linking ensures such, the resulting thermoset polymers cannot be reprocessed. This prohibits its broader utility in situations that require further processing of the printed materials. In principle, this limitation can be overcome if the DLP processing can be extended to reprocessable thermoplastic polymers. Although light curable thermoplastic polymers are known, meeting the unique DLP requirement for rapid separation between the liquid monomer and the un-crosslinked polymer is not straightforward because of their intrinsic good miscibility. Hereafter, we describe our successful attempt in DLP printing of a thermoplastic polymer and lay out key enabling factors for such a process. We further illustrate that the water dissolvable nature of the resulting polymer is advantageous in making various multifunctional 3D structures. We find that the oxygen naturally present in ambient air can inhibit the light curing process. This effect can be utilized to achieve rapid open-air printing without the complex interfacial engineering typically required for fast DLP printing methods. [21][22][23] We hypothesize that two key factors should be carefully considered for DLP printing of thermoplastic polymers (Figure 1a). Herein, two concurrent and competing processes occur: 1) the polymerization and 2) the diffusion/dissolution of the polymer into the surrounding uncured liquid monomer. Rapid liquidsolid separation is possible only if the first process dominates 3D printing has witnessed a new era in which highly complexed customized products become reality. Realizing its ultimate potential requires simultaneous attainment of both printing speed and product versatility. Among various printing techniques, digital light processing (DLP) stands out in its high speed but is limited to intractable light curable thermosets. Thermoplastic polymers, despite their reprocessibility that allows more options for further manipulation, are restricted to intrinsically slow printing methods such as fused deposition modeling. Extending DLP to thermoplastics is highly desirabl...

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Mechano‐Plastic Pyrolysis of Dynamic Covalent Polymer Network toward Hierarchical 3D Ceramics

Cited by 48 publications

References 30 publications

Hybrid Materials from Ultrahigh‐Inorganic‐Content Mineral Plastic Hydrogels: Arbitrarily Shapeable, Strong, and Tough

Hybrid Materials from Ultrahigh‐Inorganic‐Content Mineral Plastic Hydrogels: Arbitrarily Shapeable, Strong, and Tough

Reprocessable and Shape Memory Thermosetting Epoxy Resins Based on Silyl Ether Equilibration

Rapid Open‐Air Digital Light 3D Printing of Thermoplastic Polymer

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