Portal de Periódicos da CAPES

Sol-gel transition in simple silicates

1986; Elsevier BV; Volume: 82; Issue: 1-3 Linguagem: Inglês

10.1016/0022-3093(86)90119-5

1873-4812

C. Jeffrey Brinker, D. R. Tallant, E.P. Roth, C.S. Ashley,

Silicone and Siloxane Chemistry

Raman spectroscopy and DSC were used to determine the structure and average heat of formation of siloxane species formed during the gel-to-glass conversion. Based on structural studies of cyclic model compounds and MO calculations of ring strain energies, we conclude that 3 and 4-fold siloxane rings are responsible for the strong Raman bands at 608 and 490 cm−1, respectively.