Synthesis of novel hyperbranched polymers featuring oxazoline linear units and their application in fast-drying solvent-borne coating formulations

Cheng, Ge, Greenland, Barnaby W, Lampard, Chris, Williams, Neal, Bahra, Malkit S and Hayes, Wayne (2013) Synthesis of novel hyperbranched polymers featuring oxazoline linear units and their application in fast-drying solvent-borne coating formulations. Journal of Polymer Science Part A: Polymer Chemistry, 51 (18). pp. 3964-3974. ISSN 0887-624X

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Abstract

Novel acid-terminated hyperbranched polymers (HBPs) containing adipic acid and oxazoline monomers derived from oleic and linoleic acid have been synthesized via a bulk polymerization procedure. Branching was achieved as a conse- quence of an acid-catalyzed opening of the oxazoline ring to produce a trifunctional monomer in situ which delivered branching levels of >45% as determined by 1H and 13C NMR spectroscopy. The HBPs were soluble in common solvents, such as CHCl3, acetone, tetrahydrofuran, dimethylformamide, and dimethyl sulfoxide and were further functionalized by addition of citronellol to afford white-spirit soluble materials that could be used in coating formulations. During end group modification, a reduction in branching levels of the HBPs (down to 12–24%) was observed, predominantly on account of oxazoline ring reformation and trans-esterification processes
under the reaction conditions used. In comparison to commer- cial alkyd resin paint coatings, formulations of the citronellol- functionalized hyperbranched materials blended with a com- mercial alkyd resin exhibited dramatic decreases of the blend viscosity when the HBP content was increased. The curing characteristics of the HBP/alkyd blend formulations were stud- ied by dynamic mechanical analysis which revealed that the new coatings cured more quickly and produced tougher mate- rials than otherwise identical coatings prepared from only the commercial alkyd resins.

Item Type: Article
Schools and Departments: School of Life Sciences > Chemistry
Subjects: Q Science > QD Chemistry
Depositing User: Barnaby Greenland
Date Deposited: 11 Apr 2018 13:39
Last Modified: 11 Apr 2018 13:39
URI: http://sro.sussex.ac.uk/id/eprint/75012

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