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• W2046572058 abstract "A new method for syntheses of hyperbranched poly(ester-amide)s from commercially available A2 and CBx type monomers has been developed on the basis of a series of model reactions. The aliphatic and semiaromatic hyperbranched poly(ester-amide)s with multihydroxyl end groups are prepared by in situ thermal polycondensation of intermediates obtained from dicarboxylic acids (A2) and multihydroxyl primary amines (CBx) in N,N-dimethylformamide. Analyses of FTIR, 1H NMR, and 13C NMR spectra revealed the structures of the polymers obtained. The MALDI-TOF MS of the polymers indicated that cyclization side reactions occurred during polymerization. The hyperbranched poly(ester-amide)s contain configurational isomers observed by 13C and DEPT 13C NMR spectroscopy. The DBs of the polymers were determined to be 0.38−0.62 by 1H NMR or quantitive 13C NMR and DEPT 135 spectra. These polymers exhibit moderate molecular weights, with broad distributions determined by size exclusion chromatography (SEC), and possess excellent solubility in a variety of solvents such as N,N-dimethylacetamide, dimethyl sulfoxide, tetrahydrofuran, and ethanol, and display glass-transition temperatures (Tgs) between −2.3 and 53.2 °C, determined by DSC measurements. The thermogravimetric analytic measurement revealed that the decomposition temperature of the polymers at 10% weight-loss temperature (Td10) ranged from 333 to 397 °C in nitrogen." @default.
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• W2046572058 date "2006-10-12" @default.
• W2046572058 modified "2023-10-04" @default.
• W2046572058 title "Synthesis and Characterization of Hyperbranched Poly(ester-amide)s from Commercially Available Dicarboxylic Acids and Multihydroxyl Primary Amines" @default.
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• W2046572058 doi "https://doi.org/10.1021/ma060950q" @default.
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