MSA  Vol.3 No.3 , March 2012
Dielectric Spectroscopy of PVAc at Different Isobaric-Isothermal Paths
Abstract: We studied broadband dielectric spectroscopy of a glass from systems that the dynamics of the primary α- and the Johari-Goldstein (JG) β-processes are strongly correlated in Poly(vinyl acetate) over a wide temperature T and pressure P range. Analysing the temperature and pressure behaviour of the α- and (Non-JG) β-processes, a correlation hasnot been found between the structural relaxation time, the (Non-JG) β-processes relaxation time and the dispersion of the structural relaxation. These results support the idea that the (JG)-processes relaxation acts as a precursor of the structural relaxation and therefore of the glass transition phenomenon but it isnot clear relation in the (Non-JG) β-processes and structural relaxation at PVAc.
Cite this paper: S. Sharifi, "Dielectric Spectroscopy of PVAc at Different Isobaric-Isothermal Paths," Materials Sciences and Applications, Vol. 3 No. 3, 2012, pp. 168-172. doi: 10.4236/msa.2012.33026.

[1]   S. Sharifi, “Temperature Dependence of the Activation Volume of Secondary Relaxation in Glass Formers,” ISRN Materials Science, 2011, Article ID: 460751. doi:10.5402/2011/460751

[2]   S. Sharifi and J. M. Asl, “Secondary Relaxation inside the Glass,” ISRN Materials Science, 2011, Article ID: 764874. doi:10.5402/2011/764874

[3]   S. Sharifi, “Activation Volume of Secondary Relaxation,” Materials Sciences and Applications, Vol. 2, No. 6, 2011, pp. 624-628. doi:10.4236/msa.2011.26084

[4]   H. Jansson and J. Swenson, “The Slow Dielectric Debye Relaxation of Monoalcohols in Confined Geometries,” Journal of Chemical Physics, Vol. 134, No. 10, 2011, Article ID: 104504. doi:10.1063/1.3563630

[5]   R. Bergman, H. Jansson and J. Swenson, “Slow Debye-Type Peak Observed in the Dielectric Response of Polyalcohols,” Journal of Chemical Physics, Vol. 132, No. 4, 2010, Article ID: 044504. doi:10.1063/1.3294703

[6]   J. E. McKinney and R. Simha, “Configurational Thermodynamics Properties of Polymer Liquids and Glasses,” Macromolecules, Vol. 7, No. 6, 1974, pp. 894-901. doi:10.1021/ma60042a037

[7]   G. Dlubek, D. Kilburn and M. A. Alam, “Temperature and Pressure Dependence of α-Relaxation and Free Volume in Poly(vinyl acetate),” Macromolecular Chemistry and Physics, Vol. 206, No. 8, 2005, pp. 818-826. doi:10.1002/macp.200400495

[8]   M. Tyagi, A. Aleg and J. Colmenero, “Broadband Dielectric Study of Oligomer of Poly(vinyl acetate): A Detailed Comparison of Dynamics with Its Polymer Analog,” Physical Review E, Vol. 75, No. 6, 2007. doi:10.1103/PhysRevE.75.061805

[9]   A. Alegr, L. Goitiand, I. Teller and J. Colmenero, “α-Relaxation in the Glass-Transition Range of Amorphous Polymers. 2. Influence of Physical Aging on the Dielectric Relaxation,” Macromolecules, Vol. 30, No. 13, 1997, pp. 3881-3887. doi:10.1021/ma961266m

[10]   L. Goitiandi and A. Alegría, “Physical Aging of Poly (vinyl acetate). A Thermally Stimulated Depolarization Current Investigation,” Journal of Non-Crystalline Solids, Vol. 287, No. 1-3, 2001, pp. 237-241. doi:10.1016/S0022-3093(01)00578-6

[11]   G. Floudas, “Effects of Pressure on Systems with Intrinsic Orientational Order,” Progress in Polymer Science, Vol. 29, No. 11, 2004, pp. 1143-1171. doi:10.1016/j.progpolymsci.2004.08.004

[12]   K. Kessairi, S. Capaccioli, D. Prevosto, M. Lucchesi, S. Sharifi and P. A. Rolla, “Interdependence of Primary and Johari-Goldstein Secondary Relaxations in Glass-Forming Systems,” The Journal of Physical Chemistry B, Vol. 112, No. 15, 2008, pp. 4470-4473. doi:10.1021/jp800764w