01930nas a2200205   4500008004100000022001400041245011400055210006900169260006800238300001400306490000700320520114300327653000901470653002601479653001901505653001501524100002901539700002401568856013201592       2008                        eng d  a0887-626600aMolecular dynamics of copolyester/clay nanocomposites as investigated by viscoelastic and dielectric analysis0 aMolecular dynamics of copolyesterclay nanocomposites as investig  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcDEC  a2539-25550 v463 a<p>We have investigated the molecular dynamics of poly(ethylene glycol-co-cycloxeane-1,4-dimethanol terephthalate) (PETG) nanocomposites based on a organically modified layered silicate. Intercalated namocomposites were prepared by melt compounding technique as evidenced from the X-ray diffraction and transmission electron microscopy studies. Two relaxation processes were observed in pure PETG as well as in the nanocomposites. The low-temperature beta-process was assigned to the local motions of C=O polar groups and the alpha-process was due to the glass-rubber transition or the segmental relaxations associated with the polymer chain backbone. Presence of layered silicates accelerated alpha-relaxation dynamics in the nanocomposites accompanied by a depression in T(g) which was attributed to the reduced intermolecular cooperativity between intercalated polymers chains. Additionally, a direct comparison between the viscoelastic and dielectric studies shows excellent agreement between the accelerated alpha dynamics of the nanocomposites. (C) 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 2539-2555, 2008</p>10aclay10aDielectric relaxation10aNanocomposites10apolyesters1 aKalgaonkar, Rajendra, A.1 aJog, Jyoti, Prakash  uhttps://library.ncl.res.in/content/molecular-dynamics-copolyesterclay-nanocomposites-investigated-viscoelastic-and-dielectric-0