Raman system for on-line monitoring and optimisation of hybrid polymer gelation

M. Gnyba (Corresponding Author), Mikko Keränen, Arto Maaninen, Janne Suhonen, Malgorzata Jedrzejewska-Szczerska, B. Kosmowski, P. Wierzba

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)


Authors designed and built a Raman spectroscopic system for non-invasive, remote, on-line monitoring of gelation, which is the first step of a sol-gel process used for synthesis of hybrid polymers for photonics. The system was connected with typical glass reaction vessel. Suitable design of an optical system reduced excitation of interfering Raman signal in the wall of the reactor. Application of two excitation wavelengths reduced influence of fluorescence on measurements and provided high efficiency of the Raman system in wide range extending from 200 to 3500 cm–1. Synthesised materials were based on silane precursors having epoxy and amino functionality. Raman spectroscopy enabled strict control over molecular structure of the materials during the polymerization process. Time and efficiency of monomers hydrolysis were measured. Products of this reaction were evaluated. The obtained data enabled us optimisation of the process parameters which ensured high efficiency of hydrolysis and subsequent control of solution viscosity. Moreover, behaviour of amine groups and epoxy rings was investigated and influence of water and solvents was found.
Original languageEnglish
Pages (from-to)9 - 17
Number of pages9
JournalOpto-electronics Review
Issue number1
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

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