Soluble And Meltable Hyperbranched Polyborosilazanes Toward High-Temperature Stable Sibcn Ceramics

Keywords

high-temperature stability; hyperbranched; polyborosilazanes; SiBCN ceramics; soluble polymeric precursors

Abstract

High-temperature stable siliconborocarbonitride (SiBCN) ceramics produced from single-source preceramic polymers have received increased attention in the last two decades. In this contribution, soluble and meltable polyborosilazanes with hyperbranched topology (hb-PBSZ) were synthesized via a convenient solvent-free, catalyst-free and one-pot A2 + B6 strategy, an aminolysis reaction of the A2 monomer of dichloromethylsilane and the B6 monomer of tris(dichloromethylsilylethyl)borane in the presence of hexamethyldisilazane. The amine transition reaction between the intermediates of dichlorotetramethyldisilazane and tri(trimethylsilylmethylchlorosilylethyl)borane led to the formation of dendritic units of aminedialkylborons rather than trialkylborons. The cross-linked hb-PBSZ precursors exhibited a ceramic yield higher 80%. The resultant SiBCN ceramics with a boron atomic composition of 6.0-8.5% and a representative formula of Si1B0.19C1.21N0.39O0.08 showed high-temperature stability and retained their amorphous structure up to 1600 °C. These hyperbranched polyborosilazanes with soluble and meltable characteristics provide a new perspective for the design of preceramic polymers possessing advantages for high-temperature stable polymer-derived ceramics with complex structures/shapes.

Publication Date

4-1-2015

Publication Title

ACS Applied Materials and Interfaces

Volume

7

Issue

12

Number of Pages

6733-6744

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/am509129a

Socpus ID

84926367279 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84926367279

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