Journal of Organometallic Chemistry, Vol. 688, issue 1-2, p. 27-35, (2003)

Từ VLOS
Bước tới: chuyển hướng, tìm kiếm
'
Polymer Derived Si-C-B-N Ceramics via Hydroboration from Borazine Derivatives and Trivinylcyclotrisilazane
 Tạp chí Journal of Organometallic Chemistry 2003 ; 688 (1-2):27-35
 Tác giả   Quoc Dat Nghiem1, Jong-Kyu Jeon1, Lan-Young Hong2, Dong-Pyo Kim*,1
 Nơi thực hiện   1Department of Fine Chemical Engineering and Chemistry, Chungnam National University, Daejon, 305-764, Korea
2Advanced Materials Research Center, Chungnam National University, Daejeon, 305-764, Korea
 Từ khóa   Hydroboration; Polymer precursor; Trivinylcyclotrisilazane; Borazine; SiCBN ceramic
  DOI   [ URL]  [ PDF]



Abstract

2,4,6-trimethyl-2,4,6-trivinylcyclotrisilazane (VSZ) and borazine (B3N3H6) were used as starting materials to synthesize a preceramic polymer for a Si-C-B-N ceramic. The product was obtained as a soluble gel polymer by hydroboration between vinyl and B-H groups at 0oC to room temperature for 30 hours by the standard Schenk technique. The polymer-to-ceramic conversion at a ceramic yield of 70-75% was investigated by simultaneous TG/DTA, 13C and 29Si MAS NMR, IR, XRD, TEM and XPS. The polymer-derived SiCBN ceramic remained as an amorphous solid up to 1400oC, and crystallized slightly at 1800oC to show mixed XRD patterns for Si3N4, SiC and BN. The ceramic product obtained at 1000~1400oC exhibited excellent oxidation resistance in air. In addition, it was demonstrated that dense and smooth ceramic films were readily prepared by spin-coating the liquid polymer.