|
|
Synthesis of polymer precursors based on isosorbide
Šichnárek, Vojtěch ; Cigánek, Martin (referee) ; Figalla, Silvestr (advisor)
The theoretical part of the thesis deals with the description of reduced hexitols, methods of isosorbide production and its application purpose in polymer materials. It includes a description of the glucose dehydration process, the influence of reaction conditions and the catalysis of the isosorbide production, the polymerization of isosorbide monomers and their properties. The experimental part of the work is focused on the optimization of isosorbide’s laboratory synthesis‘ reaction conditions, the description of its chemical modification to polymerizable isosorbide derivatives and the physical-chemical characterization of the produced molecules. The synthesis of isosorbide is monitored by LC-MS, the product is subjected to various refining methods and a detailed structural characterization. GC was chosen for the monitoring of the preparation of isosorbide dimethacrylate and structural verification of the diester was confirmed by FT-IR, MS and NMR. The physical-chemical characterization of the prepared isosorbide dimethacrylate consists of the description of its rheological properties in mixture with a commercial methacrylated oil and the study of the reactivity of the monomers by DSC. The mixture of methacrylated oil and isosorbide dimethacrylate was used to prepare polymer thermosets which were analyzed by thermo-mechanical methods such as DMA, bending and TGA. The highest isosorbide conversion achieved value of 81.9 % after 5 hours, and it reached 94,1 % for isosorbide dimethacrylate after 8 hours. According to the results, isosorbide dimethacrylate possesses the abilty to reduce the shear viscosity of polymerizable precursors and to increase the glass transition temperature and crosslinking densities of polymer thermoset.
|
guest ::
