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Synthesis of hyperbranched polyester‐amides and their application as crosslinkers for polyurethane curing systems
Author(s) -
Lin Dong,
Liu Bing,
Xu Lei,
Budzinski Kristi L.,
Shou Chongqi
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.33678
Subject(s) - polyurethane , polyester , polymer chemistry , curing (chemistry) , materials science , trimethylolpropane , monomer , branching (polymer chemistry) , fourier transform infrared spectroscopy , ultimate tensile strength , molar mass distribution , hydroxyl value , chemical engineering , composite material , polymer , polyol , engineering
A series of hyperbranched polyester‐amides (S1, S2, S3) with trimethylolpropane as a core molecule were synthesized using core‐dilution/slow monomer addition strategy. The products were characterized by FTIR, 13 C NMR, GPC, TGA, hydroxyl value measurement, and viscosity measurement. The result showed that the hyperbranched polyester‐amides synthesized had narrow molecular weight distribution and high degree of branching (DB). The hyperbranched polyester‐amides synthesized were used as crosslinkers for polyurethane curing systems and the mechanical properties of the polyurethane curing systems were investigated. It was found that the best tensile property and tear strength were obtained when the S2 were used as crosslinkers and the molar ratio of OH and NCO was 1 : 1. It was also found that the polyurethane curing systems had the highest hardness and T g when the S3 were used as crosslinkers. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011