Program and the Book of Abstracts (PDF) - Mrs-serbia.org.rs

Tenth Young Researchers Conference – Materials Science and Engineering
December 21-23, 2011, Hall 2, SASA, Knez Mihailova 35 & 36, Belgrade, Serbia
XI/7
Tetrabutylamoniumbibenzoate catalyzed group transfer copolymerization
of tert-butyl methacrylate
Dragutin Nedeljković 1 , Aleksandar Grujić 1 , Aleksandar Stajčić 1 ,
Jasna Stajić-Trošić 1 , Jasmina Stevanović 1 , Radoslav Aleksić 2
1 Institute of Chemistry, Technology and Metallurgy, Belgrade, Serbia
2 University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia
Although it was reported that the group transfer polymerization of tert-butyl methacrylate
(tBMA) in the presence of Tetrabutylamoniumbibenzoate (TBABB) is not possible, the copolymer
was obtained in the presence of 2-(methoxyethoxy)ethyl methacrylate (DEGMA). Therefore,
statistical polymerization of DEGMA and tBMA was performed using the TBABB as a catalyst and
methyl trimethylsilyl dimethylketene acetal (MTS) as the initiator. The results were evaluated by
the Kelen-Tudos method, and the composition was determined by the NMR measurements. The
copolymerization parameters of this system were determined as r tBMA =0.054 and r DEGMA =0.73.
Those values corroborated presumption that the copolymerization parameter of the tBMA is low.
This work has been supported by the Ministry of Science of the Republic of Serbia (Project TR
34011).
XI/8
Investigation of reaction kinetics of polyurethane preparation
based on vegetable oil
Bojan Milankov, Zoran Bjelović, Mirjana Jovičić, Biljana Švonja,
Ivan Ristić, Jaroslava Budinski-Simendić, Branka Pilić
University of Novi Sad, Faculty of Technology, Novi Sad, Serbia
Castor oil is a triglyceride (ester) of fatty acids, and approximately 90% of the fatty acid content
is ricinoleic acid. Due to the existence of hydroxyl groups, the oil is suitable for reactions with
isocyanate compounds and polyurethane materials preparation. The objectives in this work were
investigation of curing kinetics by differential scanning calorimetry (DSC) and application of
Ozawa isoconversional method for calculation of kinetic parameters and to analyse how they are
influenced by the different types of isocyanates (aromatic, cycloaliphatic, aliphatic and
polyisocyante). NCO/OH ratios, r, was 1 for all experiments. Fourier transform infrared
spectroscopy (FTIR) was used to follow major curing reactions.
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