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    Zaitsev, A. I.
    The influence of glass obtaining atmosphere composition on nucleation and grows of the spherulites in SrO•2B2O3 glasses / A. I. Zaitsev, A. V. Cherepakhin, A. V. Zamkov // 3 Int. Conf. “Crystallogenesis and mineralogy” : Abstracts Vol. - Новосибирск : Изд-во СО РАН, 2013. - P. 117-118 . - ISBN 978-5-7692-1320-5
   Перевод заглавия: Влияние состава атмосферы при получении стекол на зародышеобразование и рост сферолитов в стеклах состава SrO•2B2O3

Доп.точки доступа:
Cherepakhin, A. V.; Черепахин, Александр Владимирович; Zamkov, A. V.; Замков, Анатолий Васильевич; Зайцев, Александр Иванович; International Conference on Crystallogenesis and Mineralogy (3 ; Sept. 27 – Oct. 1, 2013 ; Novosibirsk)
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Effect of monomers of 3-hydroxyhexanoate on properties of copolymers poly(3-hydroxybutyrate-co 3-hydroxyhexanoate) / T. G. Volova, M. V. Uspenskaya, E. G. Kiselev [et al.] // Polymers. - 2023. - Vol. 15, Is. 13. - Ст. 2890, DOI 10.3390/polym15132890. - Cited References: 99. - The study was funded by the Russian Science Foundation (project No 23-64-10007) . - ISSN 2073-4360
Кл.слова (ненормированные):
P(3HB-co-3HHx) copolymers -- P(3HB) homopolymer -- various synthesis conditions -- molecular weight -- crystallinity -- thermal properties -- isothermal crystallization -- spherulites
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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Держатели документа:
Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, Akademgorodok 50/50, 660036 Krasnoyarsk, Russia
School of Fundamental Biology and Biotechnology, Siberian Federal University, Svobodnyi Av. 79, 660041 Krasnoyarsk, Russia
Chemical Engineering Center, Research Institute «Bioengineering» ITMO University, Kronverksky Pr. 49, 197101 Saint Petersburg, Russia
L. V. Kirensky Institute of Physics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, Akademgorodok 50/38, 660036 Krasnoyarsk, Russia
Basic Department of Solid State Physics and Nanotechnology, School of Engineering Physics and Radio Electronics, Siberian Federal University, Kirensky St. 26, 660074 Krasnoyarsk, Russia

Доп.точки доступа:
Volova, Tatiana G.; Uspenskaya, Mayya V.; Kiselev, Evgeniy G.; Sukovatyi, Aleksey G.; Zhila, Natalia O.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Shishatskaya, Ekaterina I.
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Biodegradable polyhydroxyalkanoates with a different set of valerate monomers: Chemical structure and physicochemical properties / T. G. Volova, N. O. Zhila, E. G. Kiselev [et al.] // Int. J. Mol. Sci. - 2023. - Vol. 24, Is. 18. - Ст. 14082, DOI 10.3390/ijms241814082. - Cited References: 99. - The study was funded by the Russian Science Foundation (project no. 23-64-10007) . - ISSN 1661-6596. - ISSN 1422-0067
Кл.слова (ненормированные):
copolymers -- P(3HB-co-3HV-co-4HV) -- P(3HB-co-3HV-co-3H4MV) -- physicochemical properties -- thermal behavior -- isothermal crystallization -- spherulites formation rate -- morphology
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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Держатели документа:
Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 50/50 Akademgorodok, Krasnoyarsk 660036, Russia
Basic Department of Biotechnology, School of Fundamental Biology and Biotechnology, Siberian Federal University, 79 Svobodnyi Av., Krasnoyarsk 660041, Russia
L.V. Kirensky Institute of Physics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 50/38 Akademgorodok, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Volova, Tatiana G.; Zhila, Natalia O.; Kiselev, Evgeniy G.; Sukovatyi, Aleksey G.; Lukyanenko, A. V.; Лукьяненко, Анна Витальевна; Shishatskaya, Ekaterina I.
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