TY - JOUR
T1 - Polymerization of A2 with B3 monomers
T2 - A facile approach to hyperbranched poly(aryl ester)s
AU - Lin, Qin
AU - Long, Timothy Edward
PY - 2003/12/30
Y1 - 2003/12/30
N2 - Hyperbranched polymers have received significant attention due to their unique combination of low viscosity, excellent solubility, and facile synthesis. This paper describes an efficient approach to hyperbranched poly(aryl ester)s via the polycondensation of A2 and B3 monomers. A dilute bisphenol A (A2) solution was added slowly to a dilute 1,3,5-benzenetricarbonyl trichloride (B3) solution at 25°C to prepare hyperbranched poly(aryl ester)s in the absence of gelation. The molar ratio of A2:B3 was maintained at 1:1, and the maximum final monomer concentration was ∼0.08 M. 1H NMR spectroscopy and derivitization of terminal groups indicated that the phenol functionalities were quantitatively consumed during the polycondensation. Two model compounds were synthesized to identify 1H NMR resonances for linear, dendritic, and terminal units, and the final degree of branching was determined to be ∼50%. Moreover, the hyperbranched polymers exhibited lower glass transition temperatures relative to their linear analogues.
AB - Hyperbranched polymers have received significant attention due to their unique combination of low viscosity, excellent solubility, and facile synthesis. This paper describes an efficient approach to hyperbranched poly(aryl ester)s via the polycondensation of A2 and B3 monomers. A dilute bisphenol A (A2) solution was added slowly to a dilute 1,3,5-benzenetricarbonyl trichloride (B3) solution at 25°C to prepare hyperbranched poly(aryl ester)s in the absence of gelation. The molar ratio of A2:B3 was maintained at 1:1, and the maximum final monomer concentration was ∼0.08 M. 1H NMR spectroscopy and derivitization of terminal groups indicated that the phenol functionalities were quantitatively consumed during the polycondensation. Two model compounds were synthesized to identify 1H NMR resonances for linear, dendritic, and terminal units, and the final degree of branching was determined to be ∼50%. Moreover, the hyperbranched polymers exhibited lower glass transition temperatures relative to their linear analogues.
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U2 - 10.1021/ma0257447
DO - 10.1021/ma0257447
M3 - Article
AN - SCOPUS:0346058162
VL - 36
SP - 9809
EP - 9816
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 26
ER -