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Dendritic resins for coating applications
Author(s) -
Hult Anders,
Johansson Mats,
Malmström Eva
Publication year - 1995
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.199509801104
Subject(s) - polyester , branching (polymer chemistry) , hydroxymethyl , polymer , rheology , polymer chemistry , viscosity , materials science , catalysis , coating , molecule , chemical engineering , organic chemistry , chemistry , composite material , engineering
Hyperbranched, aliphatic polyesters of theoretically calculated molar masses 1 200–44 300 (2–7 generations) were synthesized in the molten state from 2, 2‐bis(hydroxymethyl)propionic acid (bis‐MPA) (repeating unit of AB x ‐type) and 2‐ethyl‐2‐(hydroxymethyl)‐1, 3‐propanediol (TMP) (core molecule) using acid catalysis. The synthetic procedure was a pseudo‐one‐step divergent reaction. The degree of branching was found to be near 80 %. A study has also been made with respect to the rheological properties of the hyperbranched aliphatic polyesters. The polymers exhibit an almost newtonian behaviour in the molten state. They also exhibit a lower increase in viscosity with molecular weight than linear polymers. The surface functionality is shown to greatly affect the viscosity of the polymers.