Synthesis of soluble and meltable pre‐ceramic polymers for Zr‐containing ceramic nanocomposites

Long, Xin; Shao, Changwei; Wang, Jun; Gou, Yanzi

doi:10.1002/aoc.3942

Cited by 16 publications

(12 citation statements)

References 27 publications

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“…This approach was developed by Wang et al using Zrcontaining mole-cules. [183,184] The authors performed functionalization of zirconocene dichloride ((Cp 2 ZrCl 2 ) by using an organomagnesium reagent (i.e., allyl-(CH 2 CHCH 2 MgCl) or vinyl-magnesium chloride (CH 2 CHMgCl)). Then, the as-obtained diallylbis(cyclopentadienyl)zirconium (DACZ) depicted in Figure 17 could react with a low molecular weight polycarbosilane to give a soluble crosslinked preceramic polymer labelled PCS-DACZ via free radical polymerization.…”

Section: Uhtc (Nano)composites With High Content Of Silica Former (Ie 80-vol%)mentioning

confidence: 99%

“…Synthesis of DACZ and reaction with a low molecular weight PCS. [183] Figure 18. Modification of AHPCS with Hf(NEt2)4 leading to two silicon environments in the resulting preceramic polymer (Reproduced with permission [187] ; we acknowledge the Royal Society of Chemistry for the reproduced material).…”

Section: Uhtc (Nano)composites With High Content Of Silica Former (Ie 80-vol%)mentioning

confidence: 99%

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Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

et al. 2019

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Ultra‐high temperature ceramics (UHTCs) represent an emerging class of materials capable of providing mechanical stability and heat dissipation upon operation in extreme environments, e.g., extreme heat fluxes, chemically reactive plasma conditions. In the last few decades, remarkable research efforts and progress were done concerning the physical properties of UHTCs as well as their processing. Moreover, there are vivid research activities related to developing synthetic access pathways to UHTCs and related materials with high purity, tunable composition, nano‐scaled morphology, or improved sinterability. Among them, synthesis methods considering preceramic polymers as suitable precursors to UHTCs have received increased attention in the last few years. As these synthesis techniques allow the processing of UHTCs from the liquid phase, they are highly interesting, e.g., for the fabrication of ultra‐high temperature ceramic composites (UHT CMCs), additive manufacturing of UHTCs, etc. In the present review, UHTCs are in particular discussed within the context of their physical properties as well as energetics. Moreover, various synthesis methods using preceramic polymers to access UHTCs and related materials (i.e., (nano)composites thereof with silica former phases) are summarized and critically evaluated.

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Section: Uhtc (Nano)composites With High Content Of Silica Former (Ie 80-vol%)mentioning

confidence: 99%

Section: Uhtc (Nano)composites With High Content Of Silica Former (Ie 80-vol%)mentioning

confidence: 99%

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

et al. 2019

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“…To date, polycarbosilane has also been widely used for electric or photo conductor, photoresist, and nonlinear optical materials, as well as preceramic precursors for fabricating SiC fiber, powder, whiskers, composites, and nanomaterials [35][36][37][38]. To investigate its relationships and differences with polysilane for fabricating SiC ceramics, a comparative study on the thermal behavior of some polysilanes and polycarbosilanes was carried out by Shukla et al [39].…”

Section: Polycarbosilanementioning

confidence: 99%

Organosilicon polymer-derived ceramics: An overview

Zhu

2019

J Adv Ceram

151

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Polymer-derived ceramics (PDCs) strategy shows a great deal of advantages for the fabrication of advanced ceramics. Organosilicon polymers facilitate the shaping process and different silicon-based ceramics with controllable components can be fabricated by modifying organosilicon polymers or adding fillers. It is worth noting that silicate ceramics can also be fabricated from organosilicon polymers by the introduction of active fillers, which could react with the produced silica during pyrolysis. The organosilicon polymer-derived ceramics show many unique properties, which have attracted many attentions in various fields. This review summarizes the typical organosilicon polymers and the processing of organosilicon polymers to fabricate silicon-based ceramics, especially highlights the three-dimensional (3D) printing technique for shaping the organosilicon polymerderived ceramics, which makes the possibility to fabricate silicon-based ceramics with complex structure. More importantly, the recent studies on fabricating typical non-oxide and silicate ceramics derived from organosilicon polymers and their biomedical applications are highlighted.

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“…The polymers utilized to produce the CMC matrix in the PIP process are preceramic polymers (PCPs), which are specialty materials that yield ceramics on heat treatment. , PCPs can be synthesized through straightforward chemistries like hydrosilylation, Grignard reactions, ring-opening polymerization, radical polymerization, and sol–gel methods to produce synthetically diverse PCPs with varying molecular weight, polydispersity, and viscosity. − Such synthetic tunability produces materials that not only can be processed through several techniques (i.e., additive manufacturing and fiber spinning) but can also give unique ceramic compositions. For example, polysilazanes convert to SiCN, a composition that is unobtainable using powder processing .…”

Section: Introductionmentioning

confidence: 99%

Impact of the Backbone Structure on the Rheological and Thermal Properties of Preceramic Polymer-Grafted Nanoparticles and Derived Ceramics

Martin

Street

Thompson

et al. 2021

ACS Appl. Nano Mater.

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Here, we demonstrate the synthesis of two novel preceramic grafted nanoparticles (GNPs) and compare their physical properties and derived ceramics to previously reported GNPs. Three variations of preceramic polymer GNPs are synthesized using hydrosilylation grafting-from chemistry, with brushes comprising poly(1,1dimethylpropylsilane) (allyl-GNP), poly(1,1-dimethylethylbenzylsilane) (styryl-GNP), and poly(1,1-dimethylethylsilane) (vinyl-GNP) on silica nanoparticles (10−15 nm in diameter). The brush structure is confirmed using FTIR, 1 H NMR, and dynamic light scattering (DLS). The rheological properties of the GNPs change depending on the brush composition, with the allyl-GNP displaying the formation of a strong interparticle network and the styryl-GNP exhibiting a weaker interparticle network. Thermal gravimetric analysis shows that after thermal treatment, the ceramic yield of all three GNPs increases at 800 °C, with the allyl-GNP and vinyl-GNP showing a significant improvement in yield as compared to the styryl-GNP. Finally, the three GNPs are pyrolyzed to 1400 °C giving ceramic composites with compositions dependent upon the precursor brush, as determined through X-ray diffraction (XRD) and Raman spectroscopy. This study demonstrates that hydrosilylation grafting-from is a robust method of anchoring ceramic precursor polymers to nanoparticles and can be employed to produce preceramic GNPs that subsequently convert to brush-dependent ceramic composites.

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Synthesis of soluble and meltable pre‐ceramic polymers for Zr‐containing ceramic nanocomposites

Cited by 16 publications

References 27 publications

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

Organosilicon polymer-derived ceramics: An overview

Impact of the Backbone Structure on the Rheological and Thermal Properties of Preceramic Polymer-Grafted Nanoparticles and Derived Ceramics

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