02280nas a2200241   4500008004100000022001400041245011700055210006900172260009200241300001000333490000600343520134600349653002201695653002701717653001501744653002301759653003101782100002301813700002401836700002101860700002701881856013001908       2011                        eng d  a1936-661200aStructure-property of thermoplastic polyurethane-clay nanocomposite based on covalent and dual-modified laponite0 aStructureproperty of thermoplastic polyurethaneclay nanocomposit  a26650 THE OLD RD, STE 208, VALENCIA, CA 91381-0751 USAbAMER SCIENTIFIC PUBLISHERScJAN  a65-730 v43 a<p>Modification of surface of clay platelets by ionic and covalent modification techniques renders it to be easily dispersed in polymers like, Thermoplastic Polyurethane (TPU). Only ionic or covalent modification techniques in isolation are not sufficient to achieve uniform nanoscale dispersion of Laponite (synthetic hectorite nanoclay) in TPU. Hence, the dual modification of Laponite (both ionic and covalent) is performed and the effects of the modification on the morphology, thermal and rheological behaviors of the TPU-modified clay nanocomposites have been studied. The degree of exfoliation of clay platelet in TPU matrix is found to be higher for dual functionalized nanoclays compared to their singly modified counterparts. Interestingly, dual modified Laponite clays prepared by using two different techniques (ionic followed by covalent and covalent followed by ionic) exhibit different morphology and properties. The dual modified clays significantly alter the equilibrium morphology of TPU. The storage modulus of the dual modified Laponite-TPU nanocomposite in the glassy region (at -60 degrees C) land in the rubbery region (+98 degrees C) is improved by 172.8% and 85%, respectively as compared to the neat TPU. Similarly, the onset of degradation is found to be enhanced by 28.7 degrees C as compared to the neat TPU.</p>10aDual modification10aLaponite Nanocomposite10aMorphology10aStructure-Property10aThermoplastic polyurethane1 aMishra, Ananta, K.1 aRajamohanan, P., R.1 aNando, Golok, B.1 aChattopadhyay, Santanu  uhttps://library.ncl.res.in/content/structure-property-thermoplastic-polyurethane-clay-nanocomposite-based-covalent-and-dual-0