Synthesis and Characterization of A2+B4 Hyperbranched Polyesters with Hydroxyl End Groups
2014 ◽
Vol 937
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pp. 80-85
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Keyword(s):
H Nmr
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Hydroxyl-terminated hyperbranched polyesters (HBPET) with aromatic-aliphatic structure were synthesized by melt polycondensation of isophthalic acid and pentaerythritol via A2+ B4 approach, at three different monomer mole ratios (A2/B4 =1:1, 1.5:1, 2:1, respectively). Fourier transform infrared (FTIR) spectroscopy indicated that the expected HBPET. The degree of branching of the HBPET was estimated to be between 0.39–0.45 by 1H-NMR and 13C-NMR measurement. The thermogravimetric analysis ( TGA ) measurement revealed that HBPET had a 10 % weight-loss at 350°C in N2.
2012 ◽
Vol 560-561
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pp. 174-178
2014 ◽
Vol 33
(2)
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pp. 189
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