Properties of degradable polyhydroxyalkanoates with different monomer compositions
| Autor: | Evgeniy G. Kiselev, G. Ryltseva, Ekaterina I. Shishatskaya, Tatiana G. Volova, A. G. Sukovatyi, Ivan V. Nemtsev, Andrey Kuzmin, А. Lukyanenko |
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| Rok vydání: | 2021 |
| Předmět: |
Surface Properties
Dispersity 02 engineering and technology Biochemistry Polyhydroxyalkanoates law.invention 03 medical and health sciences chemistry.chemical_compound Crystallinity Structural Biology law Copolymer Crystallization Molecular Biology 030304 developmental biology chemistry.chemical_classification 0303 health sciences Chemistry General Medicine Polymer 021001 nanoscience & nanotechnology Monomer Chemical engineering Cupriavidus necator 0210 nano-technology Glass transition |
| Zdroj: | International Journal of Biological Macromolecules. 182:98-114 |
| ISSN: | 0141-8130 |
| Popis: | Purpose To synthesize and investigate polyhydroxyalkanoates (PHAs) with different monomer composition and percentages and polymer films prepared from them. Results Various PHAs: homopolymer poly-3-hydroxybutyrate P(3HB) and 2-, 3-, and 4-component copolymers comprising various combinations of 3-hydroxybutyrate (3HB), 3-hydroxyvalerate (3HV), 4-hydroxybutyrate (4HB), and 3-hydroxyhexanoate (3HHx) monomers were synthesized under specialized conditions. Relationships were found between the monomer composition of PHAs and their molecular-weight and thermal properties and degree of crystallinity. All copolymers had decreased weight average molecular weights, Mw (to 390–600 kDa), and increased values of polydispersity (3.2–4.6) compared to the P(3HB). PHA copolymers showed different thermal behavior: an insignificant decrease in Tmelt and the presence of the second peak in the melting region and changes in parameters of crystallization and glass transition. At the same time, they retained thermostability, and the difference between Tmelt and Tdegr was at least 100–120 °C. Incorporation of 4HB, 3HV, and 3HHx monomer units into the 3-hydroxybutyrate chain caused changes in the amorphous to crystalline ratio and decreased the degree of crystallinity (Cx) to 20–40%. According to the degree to which the monomers reduced crystallinity, they were ranked as follows: 4HB – 3HHx – 3HV. A unique set of films was produced; their surface properties and physical/mechanical properties were studied as dependent on PHA composition; monomers other than 3-hydroxybutyrate were found to enhance hydrophilicity, surface development, and elasticity of polymer films. Conclusion An innovative set of PHA copolymers was synthesized and solution-cast films were prepared from them; the copolymers and films were investigated as dependent on polymer chemical composition. Results obtained in the present study contribute to the solution of a critical issue of producing degradable polymer materials. |
| Databáze: | OpenAIRE |
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