Synthesis of continuous silicon carbide fibre with high tensile strength and high Young's modulus

Step-Growth Polymerization of Poly(phenylcarbosilane) and Its Structural and Physical Properties

“…The signals detected after 17.3 min r.t. represent the by-products (Fig. 4) [13,41,42]. The GPC result confirms that the PPCS also follows a step-growth polymerization like that of PCS.…”

“…Moreover, the material recently found use as silicon oxycarbide (SiOC) or silica precursors by heat treatment in an oxidizing atmosphere [8][9][10]. Various carbosilane polymers with different functional groups have been characterized based on their structures [11][12][13], and studied for their applications [14][15][16] [ [17][18][19][20]. Some of these species have been commercialized; i.e., NIPUSI Ò (polycarbosilane, Nippon Carbon Co. Ltd., Japan), STARFIRE Ò (hydridopolycarbosilane, Starfire Systems, USA), and PPCS (ToBeM Tech, Korea).…”

“…PPCS can be synthesized in an autoclave at about 350-450°C using the Kumada rearrangement reaction in a manner similar to that of the synthesis of polycarbosilane (PCS) (Yajima process) [13,[31][32][33][34][35]. In the Kumada rearrangement reaction, first a Si free radical is formed when a Si-Si bond is cleaved by heating or UV radiation; second, rearrangement occurs to insert the CH 2 group to produce Si-CH 2 -Si and Si-H groups (Scheme 1).…”

Electroreductive polymerization of phenylmethyldichlorosilane in a divided cell using a neutral membrane

“…Polysilanes have increasing commercial importance for applications such as: precursors of silicon carbide [1], materials for photoresistors and thermochromics [2] and materials for non-linear optics [3]. So far the synthesis of polysilanes has been accomplished mainly by reductive coupling of organodichlorosilanes with an alkaline metal at refluxing temperatures [4].…”

Crack Evolution and Estimation of Fracture Toughness of HfO2/SiCN(O) Polymer Derived Ceramic Nanocomposites

“…This could be overcome by suitable microstructural design using reinforcing elements and removal of any stress raising flaws. [6][7][8] Nevertheless, an understanding on the fracture toughness behavior of these PDCs is important. Hence, the fracture toughness values can be estimated by the accurate determination of the critical stress intensity factor under mode I loading (K IC ).…”