UV-Curable polyborosilazane precursors for SiBCN coatings under harsh environments

Yangzhong Zhao, Tianhao Li, Yanpei Dang, Erxiao Wu, Jiaqi Sun, Xiao Zhang, Shiyu Du, Xiaoling Liu, Xiaosu Yi, Ping Cui, Yujie Song, Liu He

Research output: Journal PublicationArticlepeer-review

3 Citations (Scopus)

Abstract

UV irradiation is a well-established and effective process for polymer curing. However, it has been largely ignored in the field of polymer-derived ceramics (PDCs) due to its intricate mechanism and strict requirements for the precursor molecular structure. The current work designs and synthesizes a series of UV-curable polyborosilazanes containing various vinyl groups, simultaneously examines the effect of UV curing, and investigates the mechanism of curing. Cyclization mechanisms involving vinyl-free radicals and silyl-free radicals are postulated based on the molecular structure of the precursor before and after curing. The ceramic yield of UV-cured precursors is increased by up to 9.0 wt %. Moreover, SiBCN ceramics, pyrolyzed from UV-cured precursors, exhibit excellent thermal stability and remain amorphous at temperatures of up to 1600 °C. The mechanistic interpretation of UV curing opens horizons for the design and application of UV-curable ceramic precursors.
Original languageEnglish
Pages (from-to)2166-2176
Number of pages11
JournalACS Applied Polymer Materials
Volume5
Issue number3
DOIs
Publication statusPublished - 10 Mar 2023

Keywords

  • SiBCN ceramics
  • UV curing
  • UV curing mechanisms
  • Polyborosilazanes
  • Polymer-derived ceramics

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