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• W2041347207 abstract "Model associative polymers based upon poly(ethylene oxide) of Mn = 8400 with a well-defined comb structure were synthesized by a condensation reaction with isophorone diisocyanate and a long-chain 1,2-diol, purified, and characterized. By 1H NMR we determined that one polymer, Comb-81, contains 47 μmol of C14H29− groups per gram (ca. 2.5 groups per polymer) and Comb-83 contains 55 μmol of C14H29− groups per gram (ca. 8.8 groups per polymer). Fluorescence experiments employing pyrene as a probe show that these molecules form micelle-like aggregates in water through self-association. Aggregates of Comb-81 form at very low polymer concentrations (cpol < 50 ppm). Over a range of concentrations, as determined from fluorescence decay experiments, each micelle contains an average of 15 hydrophobic groups. Both dynamic light scattering and pulsed-gradient spin-echo NMR experiments indicate the hydrodynamic radii of the individual micelles formed from Comb-81 are on the order of 20−25 nm. Secondary association occurs at concentrations above ca. 0.2 wt %, and at higher concentrations leads to large increases in solution viscosity. As in other associating polymer solutions, solutions of Comb-81 exhibit a pronounced shear thinning once a critical shear rate is exceeded." @default.
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• W2041347207 date "1997-12-01" @default.
• W2041347207 modified "2023-09-27" @default.
• W2041347207 title "Synthesis and Characterization of Comb Associative Polymers Based on Poly(ethylene oxide)" @default.
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• W2041347207 doi "https://doi.org/10.1021/la960612q" @default.
• W2041347207 hasPublicationYear "1997" @default.
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