Vinyl　groups　were　used　to　functionalize　the　pore　channels　of　mesoporous　SBA-　15　materials　by　the　co-condensation　of　tetraethyl　orthosilicate　(TEOS)　and　triethoxyvinylsilane　(TEVS)　in　the　presence　of　poly(ethylene　glycol)-B-poly(propylene　glycol)-B-poly(ethylene　glycol)　(P123)　surfactants　under　acidic　conditions.　The　final　materials　were　investigated　in　detail　by　means　of　FT-IR,　XRD,　TEM,　solid　state　NMR　and　N-2　adsorption,　in　order　to　study　the　effect　of　vinyl　concentration　on　their　mesoscopic　order　and　pore　structure.　The　results　show　that　vinyl　groups　are　attached　covalently　to　the　pore　wall　of　SBA-　15　after　modification.　The　mesoscopic　architecture　almost　remains　intact　upon　functionalization,　with　only　a　minor　decrease　of　the　intensity　of　(I　10)　diffractions　for　the　20　mol%　TEVS-functionalized　samples,　which　still　preserve　a　desirable　pore　structure,　with　a　surface　area　of　883.7　m(2)/g,　a　pore　volume　of　0.98　cm(3)/g　and　a　mean　pore　size　of　4.4　nm.　(c)　2006　Published　by　Elsevier　B.V.