Samuel Kyeremateng - Aggregation Behavior of Poly(N-isopropylacrylamide) Semitelechelics with a Perfluoroalkyl Segment in Water

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  Macromolecular Chemistry and Physics 2009, Volume 210, Issue 24,   Pages 2138 - 2147



    Two hydrophobically modified PNIPAM semitelechelics     PxF9 were prepared by “clicking”     PNIPAM containing an azide endgroup     (PxN3) with     nonadecafluoro-1-decyl hex-5-ynoate (F9). Micelles     of PxF9 in water with a core of     F9-segments and a PNIPAM corona were detected by     dynamic light scattering and by 1H and     19F NMR spectroscopy below the LCST. Just below the     LCST, the PNIPAM chains start to collapse onto the     F9 core followed by aggregation of several collapsed     micelles to large particles in the range of ≈110 nm. The     F9 segments shifted the LCST to lower temperatures     when comparing PxN3 with     PxF9. The existence of micelles     in PxF9 solutions also improved     the reversibility of the LCST behavior as measured by DSC.  

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