Molecular Dynamics Analysis of PVA-AgnP Composites by Dielectric Spectroscopy
Joint Authors
Ramirez, Alejandro Manzano
González-Hernández, J.
González-Campos, J. Betzabe
Prokhorov, Evgen
Sanchez, Isaac C.
Luna-Bárcenas, J. Gabriel
López-Castro, Yliana
del Río, Rosa E.
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-07-28
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
The molecular dynamics of PVA/AgnP composites were studied by dielectric spectroscopy (DS) in the 20–300°C temperature range.
Improper water elimination leads to misinterpretation of thermal relaxations in PVA composites in agreement with the previous report for pristine PVA.
The evaporation of water and its plasticizing effect are more evident in pure PVA confirming the existence of strong interaction between OH groups of PVA chains and AgnP.
Dry films show a single nonlinear VFT dependence (from 45°C until melting) associated to the α-relaxation and, therefore, to the glass transition phenomenon and from dielectric measurements, the Tg of composites vary from 88°C for pristine PVA to 125°C for PVA/AgnP (5 wt%).
Below 45°C, dry films exhibit a single Arrhenius behavior showing a 3D hopping conductivity as explained based on the variable range hopping model.
PVA/AgnP composites have higher conductivity compared to pristine PVA, and it increases as AgnP weight percent increases.
Finally, DMA measurements support the statement that a secondary relaxation was erroneously assigned as the glass transition of PVA and composites in previous reports.
American Psychological Association (APA)
González-Campos, J. Betzabe& Prokhorov, Evgen& Sanchez, Isaac C.& Luna-Bárcenas, J. Gabriel& Ramirez, Alejandro Manzano& González-Hernández, J.…[et al.]. 2012. Molecular Dynamics Analysis of PVA-AgnP Composites by Dielectric Spectroscopy. Journal of Nanomaterials،Vol. 2012, no. 2012, pp.1-11.
https://search.emarefa.net/detail/BIM-1029319
Modern Language Association (MLA)
González-Campos, J. Betzabe…[et al.]. Molecular Dynamics Analysis of PVA-AgnP Composites by Dielectric Spectroscopy. Journal of Nanomaterials No. 2012 (2012), pp.1-11.
https://search.emarefa.net/detail/BIM-1029319
American Medical Association (AMA)
González-Campos, J. Betzabe& Prokhorov, Evgen& Sanchez, Isaac C.& Luna-Bárcenas, J. Gabriel& Ramirez, Alejandro Manzano& González-Hernández, J.…[et al.]. Molecular Dynamics Analysis of PVA-AgnP Composites by Dielectric Spectroscopy. Journal of Nanomaterials. 2012. Vol. 2012, no. 2012, pp.1-11.
https://search.emarefa.net/detail/BIM-1029319
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1029319