Author/Authors :
Anis, Eram Department of Physics - Integral University, Lucknow, India , Ali, Parvej Department of Chemistry - Integral University Campus, Shahajahanpur, India , Srivastava, Seema Department of Physics - Integral University, Lucknow, India , Baig, M W Department of Mechanical Engineering - Integral University Campus, Shahajahanpur, India , Ahmad, Moiz Department of Physics - Integral University, Lucknow, India
Abstract :
Poly (vinylidene chloride) (PVDC) is a barrier polymer which has a wide scope in food packaging
industries. A comprehensive study of the normal modes and their dispersion in PVDC using Wilson s
GF matrix method as modified by Higgs is reported. It provides a detailed interpretation of IR and
Raman spectra. Characteristic feature of dispersion curves, such as regions of high density-of-states,
repulsion, and character mixing of dispersion modes, are discussed. Heat capacity has been calculated
in the range 50–500 K via density-of-states using Debye relation. It is in fairly good agreement with
the experimental data. Heat capacity behavior of PVDC with temperature was observed nearly linear
in nature. Heat capacity provides a relationship between microscopic behavior and a macroscopic
property. The thermal stability of a polymeric system and its interactive nature with other properties,
such as phonon-phonon coupling is also related to thermodynamic behavior. The present study
provides a theoretical framework to understand experimental measurements.
Keywords :
Poly (vinylidene chloride) , Vibrational dynamics , IR , Raman Spectroscopy , Heat Capacity
