Liu L, Hu Y, Song L (2006) Synthesis and characterization of ladder-like poly(vinylsilsesquioxanes). High Performance Polymers 18(6), 919-932. [In English]

Web link:http://dx.doi.org/10.1177/0954008306068396

Keywords:

thermally stable polymers, vinyl polymerization, organic/inorganic hybrid composites, bridged polysilsesquioxanes, cubic, silsesquioxanes, polymers, octa(aminophenyl)silsesquioxane, polymethylsiloxane, poss,

Abstract: Ladder-like poly(vinylsilsesquioxanes)(LPVS) containing four parallel chains in the skeleton were synthesized by two steps: first, LPVS were prepared by a template sol-gel method from vinyltrichlorosilane (VTCS), then adjacent pendent vinyl groups were polymerized side by side along the LPVS chain. The resulting polymers (LPVS-2) were characterized by Fourier transform infrared, H-1 NMR, Si-29 NMR, thermogravimetric analysis (TGA), transmission electron microscopy, scanning electron microscopy, X-ray diffraction and elemental analysis. Experimental results reveal that both LPVS and LPVS-2 have a highly regular, ladder-like framework, and that most of the vinyl groups have taken part in the side-by-side polymerization reaction. There is no evidence that crosslinking between macromolecular chains has occurred during this process. TGA data indicate that LPVS-2 (with pendent vinyl polymerized) possesses better thermal stability than that of LPVS. For the former, no weight loss can be detected until 500 degrees C, which is attributed to its highly regular ladder-like framework consisting of a four-parallel-chain structure.