engleski

Vibrational Dynamics of Partially Ordered Molecular Systems Studied by Laser Raman Spectroscopy

As a part of our study of polymerization process we investigated the behavior of aminopropylsilanetriol (APST) dissolved in water (~25%) under low pressure (~ 5 mbar) by Raman spectroscopy. It has been already noticed that the polymerized structure of APST depends significantly on the temperature at which the condensation took place. At the same time the speed of evaporation of water could also play important role in forming different polymer structures. Raman spectra of solutions and of condensed samples were recorded. The spectra of solutions show the change in distribution of water clusters present in different solutions. Concentration of tetramers, pentamers and hexamers is increasing with decreasing content of water. On the other hand, the same condition favors formation of gauche conformation of propyl chain in APST molecules. At the same time the accelerated decrease of water contents hinders the formation of siloxane ladder structure in APST polymer.

vibrational dynamics ; Raman spectroscopy ; polymers

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