Abstract
The synthesis and thermal behavior of polyethylene with precisely placed amphiphilic branches are described. The amphiphilic branches contain tetraethylene glycol as the hydrophilic segment and either pyrene, n-hexyl, or n-tetradecyl moieties as the hydrophobic segment. Monomer and precursor structures have been confirmed by 1H and 13C NMR, elemental analysis, and high-resolution mass spectrometry. The structures of the corresponding polymers have been confirmed by 1H NMR, 13C NMR, and FTIR. Differential scanning calorimetry (DSC) and temperature-modulated DSC (MDSC) were used to study the behavior of these materials in the bulk. The branch distribution was kept constant to probe the effect of changing the hydrophobic graft end group. Altering this group produced significant changes in the observed thermal behavior, implying completely different morphologies for these materials. When the graft end group is a pyrene moiety, the polyolefin backbone crystallizes excluding the pendant branch, which aggregate ...
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