期刊
POLYMERS
卷 15, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/polym15030531
关键词
PHAs; polymer films; CO2 laser; laser processing; SEM; AFM; water contact angles; MTT test
The results of surface modification using a CO2 laser on solvent casting films made from different compositions of polyhydroxyalkanoates (PHAs) show that the modification affects the wetting contact angle, adhesion, and fibroblast growth. Continuous irradiation creates melted regions on the film surface, while quasi-pulse mode creates holes. The number of viable fibroblasts is higher in the quasi-pulse mode compared to the continuous mode.
The results of surface modification of solvent casting films made from polyhydroxyalkanoates (PHAs) of various compositions are presented: homopolymer poly-3-hydroxybutyrate P(3HB) and copolymers comprising various combinations of 3-hydroxybutyrate (3HB), 3-hydroxyvalerate (3HV), 4-hydroxybutyrate(4HB), and 3-hydroxyhexanoate (3HHx) monomers treated with a CO2 laser in continuous and quasi-pulsed radiation modes. The effects of PHAs film surface modification, depending on the composition and ratio of monomers according to the results of the study of SEM and AFM, contact angles of wetting with water, adhesion and growth of fibroblasts have been revealed for the laser radiation regime used. Under continuous irradiation with vector lines, melted regions in the form of grooves are formed on the surface of the films, in which most of the samples have increased values of the contact angle and a decrease in roughness. The quasi-pulse mode by the raster method causes the formation of holes without pronounced melted zones, the total area of which is lower by 20% compared to the area of melted grooves. The number of viable fibroblasts NIH 3T3 on the films after the quasi-pulse mode is 1.5-2.0 times higher compared to the continuous mode, and depends to a greater extent on the laser treatment mode than on the PHAs' composition. The use of various modes of laser modification on the surface of PHAs with different compositions makes it possible to influence the morphology and properties of polymer films in a targeted manner. The results that have been obtained contribute to solving the critical issue of functional biodegradable polymeric materials.
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