Comparison of phase structures and surface free energy values for the coatings synthesised from linear polyurethanes and from waterborne polyurethane cationomers
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- 作者：Piotr Kr贸l (1) pkrol@prz.edu.pl
Bo偶ena Kr贸l (1)
Kinga Pielichowska (2)
Stanis艂aw Pikus (3) - 关键词：Polyurethane coatings – ; Phase structure – ; Physical interactions – ; WAXS – ; DSC – ; AFM – ; Surface free energy parameters by van Oss– ; Good and Owens– ; Wendt methods
- 刊名：Colloid & Polymer Science
- 出版时间：October 2011
- 出版年：2011
- 期刊代码：60_0303-402X
- 类别：bio
- 卷：289
- 期：15-16
- 页码：1757-1767
- 数据来源：sp
摘要
WAXS, DSC and AFM methods were employed to compare phase structures of the coatings obtained from waterborne polyurethane cationomers which had been synthesised in the reaction of some diisocyanates (MDI, IPDI, TDI and HDI) with polyoxyethylene glycols (M = 600 and 2,000) and butane1,4-diol or N-methyl- or N-butyldiethanolamine and 2,2,3,3-tetrafluoro-1,4-butanediol. The structures were also analysed of the coatings derived from linear polyurethanes which had been synthesised on the basis of similar raw materials. Better rigidity was found for generally amorphous cationomer coats. Changes were discussed in the surface free energy (SFE) values and in their components, as calculated independently with the use of the van Oss–Good and Owens–Wendt methods. Polyurethane coats turned out more hydrophobic as compared to cationomer ones. In both coat types, fluorine incorporated into cationomers contributed to lower SFE values: from 50 down to about 30 mJ/m2.