Perfluoroalkyl end-functionalized polystyrene show lower glass transition temperatures. DSC and optical transmission studies

Polystyrenes with both hydrophilic and hydrophobic moieties: synthesis and self-assembly behaviors

“…The perfluoroalkyl end groups also affect the T g values, and a longer perfluoroalkyl end group leads to lower T g values when end group -C 3 F 7 is replaced by -C 7 F 15 , which is consistent with earlier observations. 45 It can also be found that for each group of polymers with the same hydrophilic middle group (I1, I2, or I3), the T g values of polymers with -7F and bromine end groups are very similar and their difference is less than 2 degrees. It reveals that a short perfluoroalkyl end group shows little effect on the T g .…”

“…It has been reported that longer perfluorocarbon segments may cause partial crystallization. 45 There followed the investigation and comparison of the physical properties of the polymer solutions. Considering the facts that perfluorocarbon short chains exhibit immiscibility with hydrocarbon chains and solvophobic interaction with CS 2 (the oxyethyl groups are also solvophobic), the aggregation state of polymers in CS 2 was first studied.…”