1
|
Fraga-López F, Carrillo LJ, Vázquez-Tato MP, Seijas JA, Meijide F, Vázquez Tato J, Jover A. Effect of Gold Nanoparticles on the Physical Properties of an Epoxy Resin. Int J Mol Sci 2023; 24:ijms24065638. [PMID: 36982711 PMCID: PMC10054629 DOI: 10.3390/ijms24065638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/07/2023] [Accepted: 03/09/2023] [Indexed: 03/18/2023] Open
Abstract
The effect of doping the bisphenol A diglycidyl ether (DGEBA)/m-xylylenediamine (mXDA) system with gold nanoparticles (AuNP) has been studied with differential scanning calorimetry (DSC), thermogravimetric analysis, dynamic mechanical analysis (DMA), and dielectric analysis (DEA). The evolved heat (ΔHt), the glass transition temperature (Tg), and the associated activation energies of this relaxation process have been determined. Below a certain concentration of AuNPs (=8.5%, in mg AuNP/g epoxy matrix), Tg decreases linearly with the concentration of AuNPs, but above it, Tg is not affected. The degree of conversion α of this epoxy system was analyzed by the semiempirical Kamal’s model, evidencing that diffusion correction is required at high values of α. Activation energy values suggest that AuNPs can cause some impediments at the beginning of the crosslinking process (n-order mechanism). The slight difference between the initial decomposition temperature, as well as the temperature for which the degradation rate is at a maximum, for both systems can be accepted to be within experimental error. Mechanical properties (tension, compression, and bending tests) are not affected by the presence of AuNPs. Dielectric measurements show the existence of a second Tg at high temperatures, which was analyzed using the Tsagarapoulos and Eisenberg model of the mobility restrictions of network chains bound to the filler.
Collapse
Affiliation(s)
- F. Fraga-López
- Departamento de Física Aplicada, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain
- Correspondence:
| | - Lisbeth Jiménez Carrillo
- Laboratorio de Investigación y Tecnología de Polímeros, Universidad Nacional de Costa Rica, Heredia 86-3000, Costa Rica
| | - María Pilar Vázquez-Tato
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain
| | - Julio A. Seijas
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain
| | - Francisco Meijide
- Departamento de Química Física, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain
| | - José Vázquez Tato
- Departamento de Química Física, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain
| | - Aida Jover
- Departamento de Química Física, Facultad de Ciencias, Universidad de Santiago de Compostela, Avda. Alfonso X El Sabio s/n, 27002 Lugo, Spain
| |
Collapse
|
2
|
Luzardo-Alvarez A, Almeida-Prieto S, Fraga-López F, Otero-Espinar F, Rodriguez-Núñez E, Martinez-Ageitos J, Blanco-Méndez J. Effect of formulation variables on the prediction of release from microparticles with experimental design. J Appl Polym Sci 2006. [DOI: 10.1002/app.24960] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|