AI Article Synopsis
- The study examined how molecular weight influences the formation of the β phase in poly(9,9'-dioctylfluorene) (PF8) in dilute solutions.
- Temperature-dependent fluorescence tests were conducted on different synthetic batches of polyfluorene, assessing various characteristics like molecular weight and defect concentration.
- The findings indicated a temperature-dependent transition between the α and β phases, with the transition temperature being closely linked to the molecular weight, using mean field theory to model this relationship.
Article Abstract
The effect of molecular weight on the formation of β phase poly(9,9'-dioctylfluorene) (PF8) was studied in dilute solutions. Temperature-dependent fluorescence experiments of unique synthetic batches as well as size-excluded single batches of polyflourene were studied. Each batch had unique molecular weight, tetrahedral defect concentration, and polydispersity index (PDI). Polyflourene was found to exhibit a temperature-dependent transition between two phases with distinct electronic transition signatures: the α (primary) phase and the β (secondary) phase. In dilute solutions, the temperature at which the polymer exhibited a conversion between these phases showed a clear dependence on molecular weight. We model this transition temperature for β phase formation using the mean field theory for the coil-globule transition developed by Isaac Sanchez. Results show that temperature affects the average end-to-end distance corresponding to increases in secondary electronic absorption and that the dependence on temperature related to the coil-globule transition.
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