01710nas a2200193   4500008004100000022001400041245004600055210004600101260006100147300001200208490000700220520110700227653000901334653002001343653001901363653003001382100002401412856008001436       2006                        eng d  a0267-083600aCrystallisation in polymer nanocomposites0 aCrystallisation in polymer nanocomposites  aHUDSON RD, LEEDS LS9 7DL, ENGLANDbMANEY PUBLISHINGcJUL  a797-8060 v223 a<p>Polymer nanocomposites are of interest as they exhibit extraordinary properties compared with the base polymer. The second phase dispersed in the polymer matrix can be carbon nanotubes, semi-conducting inorganic nanoparticles or layer silicates such as clay. Crystallisation in these materials is also of great interest. Polymers exhibit structures at various scales (e.g. lamella, unit cell and spherulites) and the presence of a second phase has a profound effect on crystallisation. General trends observed include acceleration/retardation of crystallisation, changes in spherulite morphology and, in a few cases, changes in the crystal structure. All these observations relate to the presence of a micrometre scale second phase. However, when the dimensions of the second phase are close to the chain dimensions, the effects on crystallisation become particularly interesting. An attempt is made in the present review to address the effect of a nanoscale second phase on aspects such as isothermal and non-isothermal crystallisation, spherulite growth, phase transformation and polymorphism.</p>10aclay10acrystallisation10aNanocomposites10apolymer matrix composites1 aJog, Jyoti, Prakash  uhttps://library.ncl.res.in/content/crystallisation-polymer-nanocomposites-001930nas 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