Dry sol-gel condensation of p-X-C6H4SiH3 (X = H, CH3, CH3O, F, Cl) to organosilica p-X-C6H4SiO3 using nickelocene.
The dry sol-gel reaction at toluene in ambient air atmosphere of p-X-C6H4SiH3 (X = H, CH3, CH3O, F, Cl) to p-C6H4SiO3 in high yield, catalyzed by nickelocene, is reported. The highest yield, molecular weight, polydispersity index, and TGA residue yield were obtained for p-Cl-C6H4SiH3. Some degree of unreacted Si-H bonds still remained in the gel because of steric reason. All the insoluble gels adopt an amorphous structure with a smooth surface. A plausible mechanism for the dry sol-gel reaction was suggested.
Cho
Myong-Shik
MS
RD Center Kumho Tire Co., Inc., Gwangju 507-711, Korea
Kim
Bo-Hye
BH
Hwang
Yun-Mi
YM
Woo
Hee-Gweon
HG
Kim
Do-Heyoung
DH
D000388:Air; D001272:Atmosphere; D002625:Chemistry, Organic / Q000379:methods; D003102:Colloids / Q000737:chemistry; D006860:Hydrogen Bonding; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D036103:Nanotechnology / Q000379:methods*; D009532:Nickel / Q000737:chemistry*; D044367:Phase Transition; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D014961:X-Ray Diffraction
D003102:Colloids; D012821:Silanes; D012822:Silicon Dioxide; D009532:Nickel