01808nas a2200229   4500008004100000022001400041245010000055210006900155260013400224300000900358490000800367520087800375653002001253653003801273653002701311100002501338700002101363700002101384700002301405700002301428856012701451       2006                        eng d  a1022-136000aSynthesis and characterization of novel hydrophobically end-capped poly(ethylene oxide)s [PEOs]0 aSynthesis and characterization of novel hydrophobically endcappe  aPO BOX 10 11 61, D-69451 WEINHEIM, GERMANYbIndo-French Ctr Promot Adv Res; Indian Assoc Cultivat Sci; Kolkata; GUENET; CNRScJUL  a9-130 v2413 a<p>We report on the synthesis and characterization of a novel hydrophobically modified end-capped poly(ethylene oxide)s. The end-capping agent of this polymer was designed and synthesised from a renewable resource material namely, gallic acid (i.e. 3,4,5-trihydroxybenzoic acid), the byproduct of tannin industry. The hydroxyl groups at 3, 4 and 5 positions of gallic acid provide an opportunity for varying the hydrophobicity of the compound. The hydrophobic end-capping compound, 3,4,5tridodecyloxy bezoylazide was prepared from gallic acid and PEGS with different chain lengths (of number average molecular weights, 10000 and 35000 g/mol) were endcapped. using 3,4,5-tridodecyloxybenzoyl azide. The quantitative analysis of end-capping in the polymers was demonstrated by H-1-NMR spectroscopy and the rheological studies were carried out in the surfactant solutions.</p>10aend-capped PEOs10ahydrophobically modified polymers10awater-soluble polymers1 aBadiger, Manohar, V.1 aKadam, Vijay, S.1 aLele, Ashish, K.1 aWadgaonkar, P., P.1 aHourdet, Dominique  uhttp://library.ncl.res.in/content/synthesis-and-characterization-novel-hydrophobically-end-capped-polyethylene-oxides-peos02669nas a2200241   4500008004100000022001400041245014200055210006900197260009900266300001400365490000700379520169300386653002402079653003102103653002502134653001802159100002102177700002502198700002802223700002302251700002302274856013002297       2008                        eng d  a0032-386100aSynthesis and self-assembling properties of alpha,omega-hydroxy-poly(ethylene oxide) end-capped with 1-isocyanato-3-pentadecylcyclohexane0 aSynthesis and selfassembling properties of alphaomegahydroxypoly  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcOCT  a4635-46460 v493 a<p>A novel hydrophobic compound, 1-isocyanato-3-pentadecylcyclohexane (PDC) issued from a renewable resource material (Cashew Nut Shell Liquid), is used to end-cap poly(ethylene oxide) (PEO) of different molecular weights. The synthesis, characterization and self-assembling properties of these new associating polymers are reported. In aqueous solution, PDC modified PEOs self-associate into micellar structures which are characterized by neutron scattering. Using a star-polymer model with sticky hard sphere interactions, it is shown that the characteristics of the micelles mainly depend on the size of the PEO chain. In the case of PDC stickers, the aggregation number decreases from 25 to 17 with increasing molecular weight of PEO, from 10 to 20 kg/mol, respectively. The temperature directly impacts the interaction potential between the hydrophilic coronas of PEO which become less repulsive with increasing temperature. Rheological measurements, performed in dilute solution, clearly demonstrate that PEO micelles self-associate into open supramolecular structures. The correlation length of these loose clusters increases with polymer concentration and the hierarchical self-assembly follows the rules of the percolation theory. The sol/gel transition takes place at the overlap concentration of clusters. In semi-dilute solution, the viscoelastic properties of PDC end-capped PEOs are well described by the Maxwell model with a single relaxation mode. The characteristic time of the network follows an Arrhenius temperature dependence with an activation energy of 70 kJ/mol, in very good agreement with the size of PDC stickers. (C) 2008 Elsevier Ltd. All rights reserved.</p>10aAssociating polymer10aHydrophobically end-capped10apoly(ethylene oxide)10aStar micelles1 aKadam, Vijay, S.1 aBadiger, Manohar, V.1 aWadgaonkar, Prakash, P.1 aDucouret, Guylaine1 aHourdet, Dominique  uhttp://library.ncl.res.in/content/synthesis-and-self-assembling-properties-alphaomega-hydroxy-polyethylene-oxide-end-capped-0