Macromolecules, Vol. 37, No. 20, 2004
Hyperbranched Poly(ester-amide)s 7593
Con clu sion s
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The melting polycondensation of commercially avail-
able aliphatic carboxylic anhydrides (AA′) and multi-
hydroxyl primary amine (CBx) without any catalysts has
been investigated as a novel approach to prepare
hyperbranched poly(ester-amide)s bearing terminal
hydroxyls. At the initial stage of polycondensation,
primary amino groups of 2-amino-2-ethyl-1,3-propanediol
or tris(hydroxymethyl)aminomethane react fast with
anhydrides forming dominant dimers, which can be
regarded as a new ABx type monomers. Further self-
polycondensations of the intermediates result in novel
aliphatic hyperbranched poly(ester-amide)s. It was
found that the optimum temperature of polycondensa-
tion is 110-120 °C. Among the hyperbranched poly-
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(ester-amide)s obtained, those bearing cyclohexyl mo-
lecular skeleton structure display the lowest degree of
branching, the highest glass transition temperature and
the best thermal stability. All the polymers display high
molecular weights with broad distributions and low
inherent viscosity and good solubility in solvents such
as ethanol, acetone, THF, DMF, and chloroform. The
glass transition temperature of the hyperbranched poly-
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the chain end functional groups and also slightly depend
on the DB for those bearing hydroxyl end groups. The
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°
C, and Tgs are in the range of 7-96 °C, depending on
the structure of the monomers used.
(
(
Ack n ow led gm en t. The authors would like to thank
Prof. Dr. Brigitte Voit at the Institut f u¨ r Polymerfors-
chung Dresden for helpeful discussion on characteriza-
tion of hyperbranched polymers.
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