کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
610336 | 880647 | 2009 | 6 صفحه PDF | دانلود رایگان |

ABA triblock copolymers, where A is an oligo(fluorooxetane) and B is poly(ethylene oxide) (PEO), are prepared easily using an α,ω-dihydroxy PEO initiator and cationic, ring-opening polymerization of a fluorinated oxetane monomer. Terminal hydroxyl groups can be converted readily and quantitatively to acetate groups using acetic anhydride. Both types of triblock copolymers are surface active in water. The hydroxyl- and acetate-terminated triblocks exhibit differences in adsorption behavior. Both materials show similar surface tension reduction efficiencies (minimum surface tension at aggregation limit); however, the acetate-terminated triblock copolymer is much more effective (surface tension reduction at a given concentration to the aggregation limit). This behavior is explained by the influence of hydrogen bonding on adsorption properties of the hydroxyl-terminated triblock copolymer compared to the acetate-terminated version.
Surface tension isotherms and fits using the Langmuir surface tension isotherm for PF4EO23PF4, 1, (□, –) and Ac-PF4EO23PF4-Ac, 2, (∘, - -) in water at room temperature.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 336, Issue 1, 1 August 2009, Pages 40–45