Vibrational Dynamics and Heat Capacity of Syndiotactic Poly(Methyl Methacrylate)

• Published in: Journal of macromolecular science. Physics Vol. 45; no. 2; pp. 263 - 284
• Main Authors: Jain, Ashika, Mohan Misra, Radha, Tandon, Poonam, Dayal Gupta, Vishwambhar
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Philadelphia, PA Taylor & Francis Group 01.03.2006; Taylor & Francis
• Subjects: Applied sciences; density-of-states; dispersion curves; Exact sciences and technology; heat capacity; Organic polymers; Physicochemistry of polymers; poly(methyl methacrylate); Properties and characterization; Thermal and thermodynamic properties; Thermal properties; Density of states; poly(methyl methacrylate); Eigenmode; Force field method; density-of- states; Heat capacity; Temperature effect; Theoretical study; Methyl methacrylate polymer; dispersion curves; Syndiotactic polymer
• ISSN: 0022-2348; 1525-609X
• DOI: 10.1080/00222340500522356

The normal modes and their dispersion in syndiotactic poly(methyl methacrylate) are obtained using Wilson's GF matrix method as modified by Higgs. Optically active frequencies corresponding to the zone center and zone boundary are identified and discussed. The Urey Bradley potential field is obtained by least square fitting of the observed infrared and Raman bands. Heat capacity was obtained from dispersion curves via density-of-states. A comparative study of isotactic and syndiotactic forms of poly(methyl methacrylate) is presented.