Тип публикации: статья из журнала

Год издания: 2022

Идентификатор DOI: 10.3390/polym14245481

Ключевые слова: poly-3-hydroxybutyrate, polyesters, bifunctional amines, aminolysis, functionalized oligomers

Аннотация: The degradation pattern of bacterial poly-3-hydroxybutyrate (PHB) in dimethylformamide (DMF) and dioxane solutions at 100 °C assisted by ethylenediamine, 1,4-diaminobutane and monoaminoethanol was studied. When diamines were introduced into the PHB solution in DMF in the amount of 1 mol of the reagent to 5 or 10 mol of PHB monomersПоказать полностью, a rapid decrease in the molecular weight of the polymer was observed. The initial value of the weight average molecular weight (Mw) 840 kDa had decreased by 20–30 times within the first 10–20 min of the experiment, followed by its gradual decrease to several thousand Da. When a similar molar quantity of aminoethanol was added, the molecular weight decreased slower. PHB had been degrading much slower in the dioxane solution than in DMF. By varying the number of reagents, it was possible to reach stabilization of the Mw at 1000–3000 Da when using diamines and 8000–20,000 Da using aminoethanol. 1H NMR analysis of the oligomers revealed of amino and amido groups forming in their structure. From the opposite end of the polymer chain, residues of 3-hydroxybutyric, crotonic and isocrotonic acids were formed during degradation. Differential scanning calorimetry indicated that after oligomerization there was a decrease in the melting point from 178 °C to 140–170 °C depending on the decrease in the molecular weight. The method proposed can be used for obtaining aminated PHB oligomers.

Журнал: Polymers

Выпуск журнала: Т.14, №24

Номера страниц: 5481

ISSN журнала: 20734360

Место издания: Basel

Издатель: MDPI

• Boyandin Anatoly Nikolayevich (Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”)
• Bessonova Viktoriya Aleksandrovna (School of Fundamental Biology and Biotechnology, Siberian Federal University)
• Ertiletskaya Natalya Leonidovna (Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”)
• Sukhanova Anna Alekseevna (Scientific Laboratory “Smart Materials and Structures”, Reshetnev Siberian State University of Science and Technology)
• Shalygina Taisiya Aleksandrovna (Scientific Laboratory “Smart Materials and Structures”, Reshetnev Siberian State University of Science and Technology)
• Kondrasenko Alexander Alexandrovich (Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”)

• Ядро РИНЦ (eLIBRARY.RU)