Journal
PROGRESS IN ORGANIC COATINGS
Volume 76, Issue 4, Pages 609-615Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2012.11.011
Keywords
Rapeseed oil; Stability; Polyurethane dispersion; DMPA content; Degree of neutralisation
Funding
- company Synthopol Chemie, Dr. rer. pol. Koch GmbH Co. KG
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Renewable resources, especially natural oils, have received increasing attention as raw materials for polymers. The synthesis and characterisation of novel aqueous polyurethane dispersions derived from rapeseed oil are investigated. The applied renewable polyol is high-hydrophobic due to the triglyceride backbone. Dimethylolpropionic acid (DMPA) as internal emulsifier was used to incorporate hydrophilic groups into the polymer chain to achieve stable self-emulsifying dispersions. By neutralisation of the carboxyl groups with triethylamine a predominately electrostatic stabilisation was generated. A weak steric stabilisation by pending chain ends exists beside the predominant electrostatic stabilisation. Outgoing from a DMPA content of 5.6 wt% related to the polymer, the content was decreased successively with the objective being to analyse the influence of ionic concentration and stability. Furthermore, the influence of the degree of neutralisation with respect to the stabilisation of these novel dispersions was investigated. (c) 2013 Elsevier B.V. All rights reserved.
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