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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zaitsev A. I., Cherepakhin A. V., Zamkov A. V.
Заглавие : The influence of glass obtaining atmosphere composition on nucleation and grows of the spherulites in SrO•2B2O3 glasses
Коллективы : International Conference on Crystallogenesis and Mineralogy (3; Sept. 27 – Oct. 1, 2013; Novosibirsk)
Место публикации : 3 Int. Conf. “Crystallogenesis and mineralogy”: Abstracts Vol. - Новосибирск: Изд-во СО РАН, 2013. - P.117-118. - ISBN 978-5-7692-1320-5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova, Tatiana G., Uspenskaya, Mayya V., Kiselev, Evgeniy G., Sukovatyi, Aleksey G., Zhila, Natalia O., Vasiliev A. D., Shishatskaya, Ekaterina I.
Заглавие : Effect of monomers of 3-hydroxyhexanoate on properties of copolymers poly(3-hydroxybutyrate-co 3-hydroxyhexanoate)
Место публикации : Polymers. - 2023. - Vol. 15, Is. 13. - Ст.2890. - ISSN 20734360 (eISSN), DOI 10.3390/polym15132890
Примечания : Cited References: 99. - The study was funded by the Russian Science Foundation (project No 23-64-10007)
Аннотация: The properties of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) P(3HB-co-3HHx) copolymers with different ratios of monomers synthesized by the wild-type strain Cupriavidus necator B-10646 on sugars, and an industrial sample from Kaneka synthesized by the recombinant strain C. necator NSDG-ΔfadB1 on soybean oil, were studied in a comparative aspect and in relation to poly(3-hydroxybutyrate) P(3HB). The copolymer samples, regardless of the synthesis conditions or the ratio of monomers, had reduced values of crystallinity degree (50–60%) and weight average molecular weight (415–520 kDa), and increased values of polydispersity (2.8–4.3) compared to P(3HB) (70–76%, 720 kDa, and 2.2). The industrial sample had differences in its thermal behavior, including a lower glass transition temperature (−2.4 °C), two peaks in its crystallization and melting regions, a lower melting point (Tmelt) (112/141 °C), and a more pronounced gap between Tmelt and the temperature of thermal degradation (Tdegr). The process, shape, and size of the spherulites formed during the isothermal crystallization of P(3HB) and P(3HB-co-3HHx) were generally similar, but differed in the maximum growth rate of the spherulites during exothermic crystallization, which was 3.5–3.7 μm/min for P(3HB), and 0.06–1.25 for the P(3HB-co-3HHx) samples. The results from studying the thermal properties and the crystallization mechanism of P(3HB-co-3HHx) copolymers are important for improving the technologies for processing polymer products from melts.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova, Tatiana G., Zhila, Natalia O., Kiselev, Evgeniy G., Sukovatyi, Aleksey G., Lukyanenko A. V., Shishatskaya, Ekaterina I.
Заглавие : Biodegradable polyhydroxyalkanoates with a different set of valerate monomers: Chemical structure and physicochemical properties
Колич.характеристики :21 с
Место публикации : Int. J. Mol. Sci. - 2023. - Vol. 24, Is. 18. - Ст.14082. - ISSN 16616596 (ISSN), DOI 10.3390/ijms241814082. - ISSN 14220067 (eISSN)
Примечания : Cited References: 99. - The study was funded by the Russian Science Foundation (project no. 23-64-10007)
Аннотация: The properties, features of thermal behavior and crystallization of copolymers containing various types of valerate monomers were studied depending on the set and ratio of monomers. We synthesized and studied the properties of three-component copolymers containing unusual monomers 4-hydroxyvalerate (4HV) and 3-hydroxy-4-methylvalerate (3H4MV), in addition to the usual 3-hydroxybutyrate (3HB) and 3-hydroxyvalerate (3HV) monomers. The results showed that P(3HB-co-3HV-co-4HV) and P(3HB-co-3HV-co-3H4MV) terpolymers tended to increase thermal stability, especially for methylated samples, including an increase in the gap between melting point (Tmelt) and thermal degradation temperature (Tdegr), an increase in the melting point and glass transition temperature, as well as a lower degree of crystallinity (40–46%) compared with P(3HB-co-3HV) (58–66%). The copolymer crystallization kinetics depended on the set and ratio of monomers. For terpolymers during exothermic crystallization, higher rates of spherulite formation (Gmax) were registered, reaching, depending on the ratio of monomers, 1.6–2.0 µm/min, which was several times higher than the Gmax index (0.52 µm/min) for the P(3HB-co-3HV) copolymer. The revealed differences in the thermal properties and crystallization kinetics of terpolymers indicate that they are promising polymers for processing into high quality products from melts.
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