Boron Subphthalocyanine Coupled to Methacrylate‐Rich Terpolymers by Nitroxide Mediated Polymerization: The Subphthalocyanine Dictates the Phase Transition Temperatures. Issue 13 (31st March 2017) - Sampson, Kathleen L.
Abstract : The polymer backbone composition of boron subphthalocyanine (BsubPc)‐containing polymers does not affect the glass transition temperature of the poly‐BsubPcs as the solid‐state arrangement is dependent on the BsubPc moiety. This is further evident from the unique aggregate‐induced emission property when poly‐BsubPc films are annealed above the glass transition temperature. Abstract : The control of the glass transition temperature ( T g ) of methacrylic acid–styrene terpolymers with n ‐butyl methacrylate (BMA) is scoped to assess their potential to alter the thermal transitions of boron subphthalocyanine (BsubPc)‐containing polymers. The change in kinetics and physical properties of the terpolymers are observed under different synthetic and process conditions such as varying molar feed of BMA, addition of 1, 4‐dioxane solvent, reaction time, concentration of N ‐tert‐butyl‐ N ‐(1‐diethylphosphono‐2, 2‐dimethylpropyl) nitroxide (SG1) mediator and initiator type to find the optimal conditions. Four terpolymers are then coupled to BsubPc using the established process. Differential scanning calorimetry analysis shows that the backbone polymer composition has little effect on the T g of the poly‐BsubPcs. Solid‐state fluorescence spectroscopy reveals that after annealing the films at temperatures higher than the T g, BsubPc aggregates are formed and, therefore, the arrangement of the polymers is dominated by the BsubPc moiety and its self‐aggregation.