Study of the gamma irradiation effects on the PMMA/HA and PMMA/SW |
| |
| Authors: | P Silva C Albano R Perera N Domínguez |
| |
| Institution: | 1. Instituto Venezolano de Investigaciones Científicas, Centro de Física, Carretera Panamericana Km. 11, Caracas 1020-A, Venezuela;2. Universidad Central de Venezuela, Facultad de Ingeniería, Venezuela;3. Departamento de Mecánica, Universidad Simón Bolívar, Caracas 1080-A, Venezuela;4. Instituto Venezolano de Investigaciones Científicas, Centro de Química, Venezuela;1. Lab. de Fisiología de Parásitos, Centro de Biofísica y Bioquímica, IVIC, Caracas 1020A, Venezuela;2. Lab. de Fisiología Molecular, Centro de Biofísica y Bioquímica, IVIC, Caracas 1020A, Venezuela;3. Facultad de Ciencias de la Salud, Universidad Centroccidental “Lisandro Alvarado”, Barquisimeto, Edo. Lara, Venezuela;1. Radiation Laboratory, Institute of Industrial Ecology, UB RAS, Ekaterinburg, Russia;2. Department of Experimental Physics, Ural Federal University, Ekaterinburg, Russia;1. Institute of Physics, Nicolaus Copernicus University, 5/7 Grudzi?dzka Str., 87-100 Toruń, Poland;2. Vlokh Institute of Physical Optics, Sector of Spectroscopy, 23 Dragomarov Str., 79-005 Lviv, Ukraine;3. Institute of Physics, University of Zielona Góra, 4a Szafrana Str., 65-069 Zielona Góra, Poland;1. Grupo de Química Computacional y Teórica (QCT), Depto. de Química e Ingeniería Química, Universidad San Francisco de Quito (USFQ), Diego de Robles y Vía Interoceánica, CP 17-1200-841 Quito, Ecuador;2. Grupo Ecuatoriano para el Estudio Experimental y Teórico de Nanosistemas –GETNano–, Universidad San Francisco de Quito, Edificio Newton, Oficina N102-C, CP 17-1200-841 Quito, Ecuador;3. Escuela de Física, Facultad de Ciencias, Escuela Superior Politécnica del Chimborazo, Riobamba, Ecuador;4. Prometheus Program, SENESCYT, Quito, Ecuador;1. Biotechnology and Electrical Plasmas Laboratory, Universidade do Vale do Paraíba (Univap), São José dos Campos, SP, 12244-000, Brazil;2. Universidade Brasil, Rua Carolina Fonseca 235, 08230-030, São Paulo, Brazil;3. Nanotechnology and Plasmas Processes Laboratory, Universidade do Vale do Paraíba (Univap), São José dos Campos, SP, 12244-000, Brazil;4. Centro de Ciência e Tecnologia de Plasmas e Materiais – PlasMat, Instituto Tecnológico de Aeronáutica (ITA-DCTA), São José dos Campos, SP, 12228-900, Brazil;5. Laboratory of Biomedical Nanotechnology, Universidade do Vale do Paraíba (Univap), São José dos Campos, SP, 12244-000, Brazil;6. Associate Laboratory of Sensors and Materials, Instituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, SP, 12227-010, Brazil;7. Biomaterials Innovation Research Center, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Cambridge, MA 02139, USA;8. Department of Chemical Engineering, Northeastern University, Boston, MA 02115, USA |
| |
| Abstract: | The behavior of the poly(methyl methacrylate) (PMMA) under the action of gamma radiation has been sufficiently studied. In this work, we present results from melt flow index (MFI), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and electron paramagnetic resonance (EPR) of PMMA composites with hydroxyapatite (HA) and seaweed residues (SW) irradiated with gamma rays at 1.08 kGy/h. Composites of PMMA/HA and PMMA/SW with 10%, 20% and 30% of the filler were prepared. The results show an increase in the MFI values with the integral dose of radiation, being consistent with chain-scission reactions. No EPR signal was observed in pure PMMA, while in the composites, the typical EPR signal of the PMMA radicals was observed, which increased with the amount of HA or SW. When comparing the relative intensities of the EPR signals for both types of composites, a slight increase in the concentration of free radicals generated in the sample with SW respect to that of PMMA/HA composite was obtained. A decay of the total free radical concentration was observed as time elapsed. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
