Bor içeren polimerlerin sentezi ve karakterizasyonu

Boron is a Group 13 element that has properties which are borderline between metals and non-metals (semimetallic) which atomic number is 5. Boron compounds have specialized roles in high strength, low weight structuralmaterials. For example, boron is used in glass and ceramic industry for making material resistant to heat. Especially because of its flame retardant properties, usage of boron in polymers is increased in past few years. According to the studies, reactions between boron element and acrylic polymers resulted with acrylic polymers containing boron. Acrylic polymers can be used in many industries, primarily in dye industry, and also it has many copolymer derivatives. In this study, boron containing acrylic monomers was synthesized and characterized. Afterwards, homopolymers and copolymers were synthesized from the boron containing acrylic monomer. Free radical polymerization is choosen as the polymerization method and finally, polymers are characterized with different methods. In this thesis, firstly with esterification reaction boron acrylic monomer is synthesized. Boric acid, neopentyl glycol and as for acrylic monomer HEMA (2- hydroxyethyl methacylate) are reacted to obtain boron containing acrylic monomer. Characterization is made by FT-IR, 13C-NMR, 1H-NMR ve 11B-NMR and results of synthesized monomer is compared with HEMA. After the characterization, homopolymer and copolymers with styrene (St) and methyl methacylate (MMA) are synthesized by free radical polymerization. Properties of copolymer synthesized with St is examined detaily. Monomer reactivity ratios for the studied monomer pair were calculated by using extended Kelen-Tudos (EKT) method. Copolymerization composition and reactive ratios show that the copolymerization is occured randomly. Thermal behaviors of synthesized polymers are studied by TGA and DSC methods. Homopolymer has one glass transition temperature at 72.3 oC. In addition the styrene homopolymer glass transition temaparature at 74.2 oC. Depending on the copolymer composition, the glass transition temperatures of boron acrylic-styrene copolymers have between at 62.9 oC and 97.2 oC. As a result of TGA analyzes, TGA diagrams of copolymers were determined to be in between TGA diagrams of pBAc and pSt . Based on these results, while St copolymer has one decomposition, BAc homopolymer has two decomposition.