The waterborne polyurethane dispersions based on polycarbonate diol: effect of ionic content

0391701 - ÚMCH 2014 RIV CH eng J - Journal Article
Cakić, S. M. - Špírková, Milena - Ristić, I. S. - B-Simendić, J. K. - M-Cincović, M. - Poreba, Rafal
The waterborne polyurethane dispersions based on polycarbonate diol: effect of ionic content.
Materials Chemistry and Physics. Roč. 138, č. 1 (2013), s. 277-285. ISSN 0254-0584. E-ISSN 1879-3312
R&D Projects: GA ČR GAP108/10/0195
Institutional research plan: CEZ:AV0Z40500505
Keywords : coatings * chemical synthesis * thermogravimetric analysis (TGA)
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 2.129, year: 2013

Three water-based polyurethane dispersions (PUD) were synthesized by modified dispersing procedure using polycarbonate diol (PCD), isophorone diisocyanate (IPDI), dimethylolpropionic acid (DMPA), triethylamine (TEA) and ethylenediamine (EDA). The ionic group content in the polyurethane-ionomer structure was varied by changing the amount of the internal emulsifier, DMPA (4.5, 7.5 and 10 wt.% to the prepolymer weight). The expected structures of obtained materials were confirmed by FTIR spectroscopy. The effect of the DMPA content on the thermal properties of polyurethane films was measured by TGA, DTA, DSC and DMTA methods. Increased DMPA amounts result in the higher hard segment contents and in the increase of the weight loss corresponding to the degradation of the hard segments. The reduction of hard segment content led to the elevated temperature of decomposition and to the decrease of the glass transition temperature and thermoplasticity. The atomic force microscopy (AFM), results indicated that phase separation between hard and soft segment of PUD with higher DMPA content is more significant than of PUD with lower DMPA content. The physico-mechanical properties, such as hardness, adhesion test and gloss of the dried films were also determined considering the effect of DMPA content on coating properties.
Permanent Link: http://hdl.handle.net/11104/0227920