Synthesis of poly [(methylsi1oxane)- co -(dimethylsilazane)] copolymers as precursors of ceramic materials

Rodriguez‐Baeza, Mario; C., Andrónico Neira; Aguilera, Jordi

doi:10.1007/s00289-003-0139-y

Cited by 5 publications

(2 citation statements)

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“…2,2,4,4,6,6-Hexamethylcyclotrisilazane was cationically copolymerized with 1,3,5,7-tetramethylcyclotetrasiloxane to form a copolymer where silazane repeat units were interspersed with siloxane repeat units in the polymer. 231 While this polymer, as expected, is not an exclusive Si 3 N 4 former, this report highlights the versatility of the cationic ring-opening chemistry for preparing polysilazane derivatives with other preceramic monomers. By TGA, copolymers with increasing methylsiloxane repeat units increased the thermal stability of the copolymer above that of the pure polysilazane control, which was the least thermally stable in the series.…”

Section: Commercial Preceramic Polysilazanessupporting

confidence: 64%

“…Copolymers consisting of silazanes and other polymers have been investigated in several studies and represent an interesting area of study. 2,2,4,4,6,6-Hexamethylcyclotrisilazane was cationically copolymerized with 1,3,5,7-tetramethylcyclotetrasiloxane to form a copolymer where silazane repeat units were interspersed with siloxane repeat units in the polymer . While this polymer, as expected, is not an exclusive Si 3 N 4 former, this report highlights the versatility of the cationic ring-opening chemistry for preparing polysilazane derivatives with other preceramic monomers.…”

Section: Chemistry and Synthesismentioning

confidence: 99%

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Advances in the Synthesis of Preceramic Polymers for the Formation of Silicon-Based and Ultrahigh-Temperature Non-Oxide Ceramics

et al. 2023

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Preceramic polymers (PCPs) are a group of specialty macromolecules that serve as precursors for generating inorganics, including ceramic carbides, nitrides, and borides. PCPs represent interesting synthetic challenges for chemists due to the elements incorporated into their structure. This group of polymers is also of interest to engineers as PCPs enable the processing of polymer-derived ceramic products including high-performance ceramic fibers and composites. These finished ceramic materials are of growing significance for applications that experience extreme operating environments (e.g., aerospace propulsion and high-speed atmospheric flight). This Review provides an overview of advances in the synthesis and postpolymerization modification of macromolecules forming nonoxide ceramics. These PCPs include polycarbosilanes, polysilanes, polysilazanes, and precursors for ultrahigh-temperature ceramics. Following our review of PCP synthetic chemistry, we provide examples of the application and processing of these polymers, including their use in fiber spinning, composite fabrication, and additive manufacturing. The principal objective of this Review is to provide a resource that bridges the disciplines of synthetic chemistry and ceramic engineering while providing both insights and inspiration for future collaborative work that will ultimately drive the PCP field forward.

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Section: Commercial Preceramic Polysilazanessupporting

confidence: 64%

Section: Chemistry and Synthesismentioning

confidence: 99%

Advances in the Synthesis of Preceramic Polymers for the Formation of Silicon-Based and Ultrahigh-Temperature Non-Oxide Ceramics

et al. 2023

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Siloxane‐Containing Polymers

Ganachaud

Boileau

2009

Handbook of Ring‐Opening Polymerization

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Sulfonated Polymethylsiloxane as an Additive for Selective Calcium Oxalate Crystallization

et al. 2014

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Sulfonated and fluorescent polymethylsiloxanes (SO 3 H-PMS) were synthesized, and their effect as additives on in vitro calcium oxalate (CaOx) crystallization was evaluated. SO 3 H-PMS was prepared by hydrosilylation and sulfonation reactions with poly(dimethylsiloxane-co-hydrogenmethylsiloxane) (PDMS-co-PMHS). Several analytical tools were used to investigate the morphology, crystal structure, and chemical contents of the harvested CaOx crystals. Varying the concentration of SO 3 H-PMS induces a transition of CaOx monohydrate (COM) with expanded multilayer and circular [a]1167 stacked-sheet morphologies as well as of the bipyramidal CaOx dihydrate (COD) crystals in three crystallization procedures. Energy-dispersive X-ray spectroscopy (EDS) and XRD allowed detecting the presence of Si (0.2-1.0°wt.-%), which stems from SO 3 H-PMS adsorbed on CaOx, and the selective formation of phases of COM and COD. We demonstrated that the presence of anionic moieties on the SO 3 H-PMS backbone and their concentration were crucial to control the crystal type, morphology, crystal size, and chemical composition.Konstanzer Online-Publikations-System (KOPS) URL: http://nbn-resolving.de/urn:nbn:de:bsz:352-2-olb1hynr5usr3 Erschienen in

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Synthesis of poly [(methylsi1oxane)- co -(dimethylsilazane)] copolymers as precursors of ceramic materials

Cited by 5 publications

References 1 publication

Advances in the Synthesis of Preceramic Polymers for the Formation of Silicon-Based and Ultrahigh-Temperature Non-Oxide Ceramics

Advances in the Synthesis of Preceramic Polymers for the Formation of Silicon-Based and Ultrahigh-Temperature Non-Oxide Ceramics

Siloxane‐Containing Polymers

Sulfonated Polymethylsiloxane as an Additive for Selective Calcium Oxalate Crystallization

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