| 摘要 |
Silanes of the general formula (I): {XaRbSi(R'(A)c)(4-a-b)}xB(I) in which the groups and indices have the following meaning: X: hydrogen, halogen, hydroxy, alkoxy, acyloxy, alkyl carbonyl, alkoxycarbonyl or -NR''2; R: alkyl, alkenyl, aryl, alkaryl, or aralkyl; R': alkylene, arylene or alkylene arylene; R'': hydrogen, alkyl or aryl; A: O, S, PR'', POR'', NHC(O)O or NHC(O)NR''; B: straight chain or branched organic group, which is derived from a B' compound with at least one C=C double bond for c=1 and A=NHC(O)O or NHC(O)NR'') or at least two C=C double bonds, and 5 to 50 carbon atoms; a: 1, 2 or 3; b: 0, 1 or 2; c: 0 or 1; x: whole number, whose maximum value corresponds to the number of double bonds in compound B' minus 1, or is equal to the number of double bonds in compound B', when c=1 and A stands for NHC(O)O or NHC(O)NR''; are suitable to prepare homo and copolycondensates and homo or copolymers according to the sol-gel method or by photochemical or thermal polymerization.
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