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полный	информационный	краткий

Поисковый запрос: (<.>S=SURFACE<.>)

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Laser Processing of Polymer Films Fabricated from PHAs Differing in Their Monomer Composition / T. G. Volova, A. I. Golubev, I. V. Nemtsev [et al.] // Polymers. - 2021. - Vol. 13, Is. 10. - Ст. 1553, DOI 10.3390/polym13101553. - Cited References:87. - This work was supported by the Russian Foundation for Basic Research/Regional State Autonomous Institution "Krasnoyarsk Regional Fund for the Support of Scientific and ScientificTechnical Activities" foundations under Grant number 19-43-240012 (laser treatment and films properties) and by the State Assignment of the Ministry of Science and Higher Education of the Russian Federation No. FSRZ-2020-0006 (polymer synthesis). . - ISSN 2073-4360

РУБ Polymer Science
Рубрики:
CHEMOMECHANICAL PROPERTIES
PHYSICOCHEMICAL PROPERTIES
SURFACE
Кл.слова (ненормированные):
P(3HB) -- copolymers -- films -- CO2 laser -- SEM -- AFM -- water contact angles -- MTT assay
Аннотация: The study reports results of using a CO2-laser in continuous wave (3 W; 2 m/s) and quasi-pulsed (13.5 W; 1 m/s) modes to treat films prepared by solvent casting technique from four types of polyhydroxyalkanoates (PHAs), namely poly-3-hydroxybutyrate and three copolymers of 3-hydroxybutyrate: with 4-hydroxybutyrate, 3-hydroxyvalerate, and 3-hydroxyhexanoate (each second monomer constituting about 30 mol.%). The PHAs differed in their thermal and molecular weight properties and degree of crystallinity. Pristine films differed in porosity, hydrophilicity, and roughness parameters. The two modes of laser treatment altered these parameters and biocompatibility in diverse ways. Films of P(3HB) had water contact angle and surface energy of 92 degrees and 30.8 mN/m, respectively, and average roughness of 144 nm. The water contact angle of copolymer films decreased to 80-56 degrees and surface energy and roughness increased to 41-57 mN/m and 172-290 nm, respectively. Treatment in either mode resulted in different modifications of the films, depending on their composition and irradiation mode. Laser-treated P(3HB) films exhibited a decrease in water contact angle, which was more considerable after the treatment in the quasi-pulsed mode. Roughness parameters were changed by the treatment in both modes. Continuous wave line-by-line irradiation caused formation of sintered grooves on the film surface, which exhibited some change in water contact angle (76-80 degrees) and reduced roughness parameters (to 40-45 mN/m) for most films. Treatment in the quasi-pulsed raster mode resulted in the formation of pits with no pronounced sintered regions on the film surface, a more considerably decreased water contact angle (to 67-76 degrees), and increased roughness of most specimens. Colorimetric assay for assessing cell metabolic activity (MTT) in NIH 3T3 mouse fibroblast culture showed that the number of fibroblasts on the films treated in the continuous wave mode was somewhat lower; treatment in quasi-pulsed radiation mode caused an increase in the number of viable cells by a factor of 1.26 to 1.76, depending on PHA composition. This is an important result, offering an opportunity of targeted surface modification of PHA products aimed at preventing or facilitating cell attachment.

WOS
Держатели документа:
Siberian Fed Univ, Sch Fundamental Biol & Biotechnol, Basic Dept Biotechnol, 79 Svobodnyi Av, Krasnoyarsk 660041, Russia.
Krasnoyarsk Sci Ctr SB RAS, Inst Biophys SB RAS, Fed Res Ctr, 50-50 Akademgorodok, Krasnoyarsk 660036, Russia.
Krasnoyarsk Sci Ctr SB RAS, LV Kirensky Inst Phys SB RAS, Fed Res Ctr, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.
Krasnoyarsk Sci Ctr SB RAS, Special Design & Technol BureauNaukaFed Res Ctr, 50-45 Akademgorodok, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Fed Res Ctr, 50 Akademgorodok, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Volova, Tatiana G.; Golubev, Alexey, I; Nemtsev, Ivan, V; Lukyanenko, Anna, V; Dudaev, Alexey E.; Shishatskaya, Ekaterina, I; Russian Foundation for Basic Research/Regional State Autonomous Institution "Krasnoyarsk Regional Fund for the Support of Scientific and ScientificTechnical Activities" foundations [19-43-240012]; Ministry of Science and Higher Education of the Russian Federation [FSRZ-2020-0006]

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