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- MakaleYalnız künye2024Scopus SJRQ2Synthesis and characterization of MgO-doped PHA bio-composites
Aydın, Handan
In this study, a highly useable MgO doped polymer composite of Polyhydroxyalkanoates (PHA), which is an alternative to conventional plastics and an environmentally friendly plastic material due to its biodegradability, was investigated. PHA-MgO composites were obtained by stirring in a suitable solution for a long time with the help of a homogenizer. Then, MgO was added and the changes in Poly Hydroxy Alkonate (PHA) polymer composites were investigated according to the changing MgO ratio. Composites were prepared by adding MgO at different ratios of 1 %, 5 %, 10 % and 15 % into PHA. The structural results of the prepared samples were investigated by using XRD (X-Ray Diffraction) and SEM (Scanning Electron Microscopy). In addition, the thermal properties of the composites were investigated by DSC (Differential Scanning Calorimetry) and TGA (Thermogravimetric Analysis). Furthermore, the optical properties of PHA-MgO composites were determined by UV-VIS spectrometry. Finally, since PHA polymer exhibits shape memory properties, the shape memory properties of the composites were also investigated.
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İncele - MakaleAçık Erişim2017Scopus SJRQ2Synthesis, thermal degradation and dielectric properties of poly[2-hydroxy,3-(1-naphthyloxy)propyl methacrylate]
Biryan, Fatih; Demirelli, Kadir; Torgut, Gulben; Pihtili, Guzin
2-Hydroxy-3-(1-naphthyloxy)propyl methacrylate (NOPMA) monomer was synthesized from reaction of 2-[(2-naphthyloxy)methyl]oxirane with methacrylic acid in the presence of pyridine. The polymerization of NOPMA was carried out by free radical polymerization method in the presence of AIBN at 60 A degrees C. The structure of monomer and polymer was characterized by H-1-NMR, C-13-NMR and FT-IR spectroscopy techniques. The glass transition temperature and average-molecular weights of poly(NOPMA) were measured using differential scanning calorimetry and gel permeation chromatography, respectively. The thermal degradation behavior of poly(NOPMA) has been investigated by FT-IR studies of the partially degraded polymer and thermogravimetry. The cold ring fractions (CRFs) were collected at two different temperatures, initially fraction-1 (CRF1) is from room temperature to 320 A degrees C, and the other fraction-2 (CRF2) is from 320 to 500 A degrees C. The volatile products of the degradation were trapped at -195 A degrees C (in liquid nitrogen). All the fractions were characterized by FT-IR, H-1 and C-13-NMR spectroscopic techniques, and the cold ring fractions (CRFs) were also characterized by GC-MS. For the degradation of polymer, the major compound between products of CRFs is alpha-naphthol. The GC-MS, FT-IR and NMR data showed that depolymerization corresponding to monomer was not prominent below 320 A degrees C in the thermal degradation of poly(NOPMA). The mode of thermal degradation containing formation of the major products was identified. The dielectric permittivity (epsilon'), the loss factor (epsilon aEuro(3)) and conductivity (sigma(ac)) were measured using a dielectric analyzer in the frequency range of 50 Hz to 20 kHz.
AtıfWoS17OpenAlex22İncele