Densely crosslinked polycarbosiloxanes. I. Synthesis

✍ Scribed by T. A. C. Flipsen; R. Derks; H. Van Der Vegt; A. J. Pennings; G. Hadziioannou

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 300 KB
• Volume: 35
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(19970115)35:1<41::aid-pola6>3.0.co;2-5

✦ Synopsis

Novel densely crosslinked polycarbosiloxanes were obtained by using functional branched prepolymers. Two types of soluble prepolymers were prepared from di-and trifunctional alkoxysilane monomers via cohydrolysis/condensation and for both final crosslinking occurred via hydrosilylation. The prepolymers having only vinyl functionalities (poly[phenylmethylvinyl]siloxanes, system A) were crosslinked by using a crosslinking agent with reactive silicon-hydrogen bonds. In the prepolymers having both silicon-vinyl and silicon-hydrogen functionalities (poly[phenylmethyl-vinylhydro]siloxanes, system B) crosslinking took place intermolecularly. For the characterization of the prepolymers 1 H-NMR, 29 Si-NMR, FT-IR spectroscopy, analytical SEC and VPO were employed. The prepolymers were fractionated with preparative SEC and the fractions analyzed with 1 H-NMR and analytical SEC. The crosslinking reaction was followed by FT-IR spectroscopy. The polymer networks were fully transparent homogeneous materials and are promising for future optical applications.