01976nas a2200217   4500008004100000022001400041245015600055210006900211260009900280300001400379490000700393520106900400653002201469653001901491653003101510100002301541700002701564700002401591700002101615856012201636       2011                        eng d  a0032-386100aEffect of tethering on the structure-property relationship of TPU-dual modified laponite clay nanocomposites prepared by ex-situ and in-situ techniques0 aEffect of tethering on the structureproperty relationship of TPU  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcFEB  a1071-10830 v523 a<p>Novel Thermoplastic Polyurethane (TPU)-dual modified Laponite clay nanocomposites were prepared by ex-situ and in-situ techniques. Two types of modified clays used in this work differ from each other by the number of active functional groups (tethering). Modified nanoclays are characterized by FTIR, Solid State NMR, XRD and TGA. Structural differences in the modified clays lead to novel tubular, elliptical and spherically aggregated morphologies of clays together with the hard segments of TPU. Changes in such morphology result in the difference in segmental relaxation, mechanical and rheological properties of the nanocomposites. In-situ prepared nanocomposites register inferior properties as compared to their ex-situ counterparts. The percent improvement in tensile strength and elongation at break of the ex-situ prepared nanocomposites with the modified clay having lesser tethering are found to be 67% and 208%, respectively. Thermal stability is enhanced by 35 degrees C as compared to that of the neat TPU. (C) 2010 Published by Elsevier Ltd.</p>10aDual modification10aNanocomposites10aThermoplastic polyurethane1 aMishra, Ananta, K.1 aChattopadhyay, Santanu1 aRajamohanan, P., R.1 aNando, Golok, B.  uhttps://library.ncl.res.in/content/effect-tethering-structure-property-relationship-tpu-dual-modified-laponite-clay-002280nas 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-001894nas a2200181   4500008004100000245009800041210006900139260000800208300001600216490000600232520123800238100001701476700001901493700002501512700002401537700002701561856012401588       2016                        eng d00aPVAc/PEDOT:PSS/graphene-iron oxide nanocomposite (GINC): an efficient thermoelectric material0 aPVAcPEDOTPSSgrapheneiron oxide nanocomposite GINC an efficient t  cFEB  a22453-224600 v63 aA green method for the synthesis of a graphene-iron oxide nanocomposite (GINC) and its PVAc based polymer nanocomposites was reported in an earlier communication. The fabricated PVAc-GINC film exhibited a conductivity of 2.18 x 104 S m(-1) with a Seebeck coefficient of 38.8 mu V K-1. Hence, the power factor (PF) reached a value of 32.90 mu W m(-1) K-2 which is 27 fold higher than a thermoelectric material based on a PVAc-graphene composite as reported in the contemporary literature. In continuation of the above mentioned study, PEDOT:PSS was used to further enhance the power factor (PT) and figure of merit (ZT) of the system. During evaluation, a PEDOT: PSS/GINC composite (5 : 95) showed a remarkable increase in various thermoelectric properties like electrical conductivity (8.0 x 10(4) S m(-1)) with a Seebeck coefficient of 25.42 mu V K-1 and thermal conductivity 0.90 m(-1) K-1. Hence PF and ZT reach up to 51.93 mW m(-1) K-2 and 0.017, respectively. To improve the mechanical strength of the polymer composite, cellulose fibre was also employed. By the addition of cellulose fibre, though the mechanical strength of the composite increases the PF reaches 5.6, which is 10 times lower than the PEDOT:PSS/GINC composite.1 aDey, Abhijit1 aMaity, Arunava1 aKhan, Md, Abdul Shaf1 aSikder, Arun, Kanti1 aChattopadhyay, Santanu  uhttps://library.ncl.res.in/content/pvacpedotpssgraphene-iron-oxide-nanocomposite-ginc-efficient-thermoelectric-material