Organo-functionalized MSU-X[R-MSU-S,R=CH3, C6H5, CH2=CH and NH2CONH (CH2)3] silicates were prepared by one-pot synthesis methodology, using an improved procedure, developed for synthesizing MSU-X. The incorporated organic groups were characterized by XRD, FT-IR, 13^C, 29^Si CP MAS NMR, HRTEM, SEM, TG, N2physisorption techniques, bulk element analysis and small angle X-ray scattering (SAXS). The surface morphology and textural porperties of such materials varied with R groups in organosiloxanes precursor and their content in the pore. The effects of the organic groups on the modified MSU-1 were investigated carefully. SAXS results show that the organic groups appeared to be uniformly distributed in R-MSU-X and form interfacial layers that led to the scattering of the pore distortion and gave a negative deviation from Porod's law. The average thickness of the interfacial layer was further obtained by analyzing this deviation.

Key words: MOLECULAR SIEVE, SILOXANE, HYDROLYSIS, POLYCONDENSATION, FUNCTIONAL GROUP, TEXTURE