Synthesis and structural studies of an epoxidized natural rubber/titania (ENR-50/TiO2) hybrid under mild acid conditions
| Autor: | Rosniza Hamzah, Mohamad Hafizi Abu Bakar, Omar S. Dahham, Saad S. Dahham, Sam Sung Ting, Khairunnisa Muhamad, Tijjani Adam, Mohd Firdaus Omar, Nik Noriman Zulkepli |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Organic Chemistry Epoxide 02 engineering and technology Polymer Carbon-13 NMR 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Acetic acid chemistry Natural rubber visual_art Polymer chemistry Proton NMR visual_art.visual_art_medium Fourier transform infrared spectroscopy 0210 nano-technology Two-dimensional nuclear magnetic resonance spectroscopy |
| Zdroj: | Polymer Testing. 65:10-20 |
| ISSN: | 0142-9418 |
| DOI: | 10.1016/j.polymertesting.2017.11.005 |
| Popis: | The ring-opening reaction of epoxide units in an epoxidized natural rubber/titania (ENR-50/TiO2) hybrid in the presence of acetic acid was studied using NMR techniques as well as FTIR spectroscopy. The thermal characteristics of the hybrid were evaluated using TG/DTG and DSC analyses. 1H NMR results suggest that 86.51% of the epoxide rings had opened in the hybrid, and the 13C NMR results revealed new peaks from the hybrid at δ 22.3, 34.8 and 72.2 ppm. 2D NMR (HMQC, HMBC and COSY) techniques further confirmed these assignments. FTIR spectra showed a characteristic Ti-O-C peak at 1028 cm−1. The TG/DTG results showed four decomposition steps at 30-159, 229-325, 325-466 and 664-825 °C due to the presence of Ti moieties along with the mixture of polymer chains i.e., the ring-opened and intact epoxides of ENR-50, which also led to an increase in the Tg value of the hybrid (27.8 °C) compared with purified ENR-50 (-17.7 °C). |
| Databáze: | OpenAIRE |
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