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Dielectric Properties of Hyperbranched Polyesteramide with Long Alkyl Chain End Groups
Author(s) -
Elrehim Mona Abd,
Said Shereen,
Ghoneim Ahmed,
Turky Gamal
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200750801
Subject(s) - maleic anhydride , materials science , alkyl , monomer , polymer chemistry , dielectric , polymer , amide , fourier transform infrared spectroscopy , relaxation (psychology) , polyester , amine gas treating , chemical engineering , organic chemistry , chemistry , composite material , copolymer , psychology , social psychology , optoelectronics , engineering
Summary: Hyperbranched polyesteramides were prepared using phethalic anhydride (Ph An) or maleic anhydride (M An) as an A 2 monomer and diethanol amine (DEA) as B′B 2 monomer. Bulk condensation technique was used to synthesize polymers with both OH and modified polymers with long alkyl chain end groups. The prepared polymers were characterized using 1 H‐NMR, FTIR and TGA. Solution viscosity for hyperbranched polyester amide with hydroxyl end groups was measured as well. Dielectric and electric properties of the modified samples were investigated over a range of frequency and temperatures. No relaxation peak is noticed in the dielectric spectrum ε(ν) at various temperatures. The illustration of the imaginary part of the electric modulus M″ versus frequency shows a peak which is shifted towards higher frequency in increasing temperature.