Surface free energy of polyurethane coatings with improved hydrophobicity
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- 作者：Piotr Kr贸l (1) pkrol@prz.edu.pl
Bo偶ena Kr贸l (1) - 关键词：Polyurethane coatings – ; Phase structure – ; Physico ; chemical interactions – ; WAXS – ; DSC – ; Surface free energy parameters by van Oss– ; Good and Owens– ; Wendt methods
- 刊名：Colloid & Polymer Science
- 出版时间：July 2012
- 出版年：2012
- 期刊代码：60_0303-402X
- 类别：bio
- 卷：290
- 期：10
- 页码：879-893
- 数据来源：sp
摘要
The polarity of polyurethane coats was studied on the basis of the goniometric method for determination of wetting angle values, on the basis of calculated surface free energy (SFE) values by the van Oss–Good and Owens–Wendt methods, and on the basis of polarity measurements with the use of the 1H NMR spectra. Test polyurethanes were synthesised in the reaction of methylene diphenyl 4,4′-diisocyanate (MDI) or 3-izocyanatomethyl –3,5,5- trimethylcyclohexyl isocyanate (IPDI) and polyoxyethylene glycols or polyesters poly(ε-caprolactone) diols and poly(ethyleneadipate) diol with different molecular weights, and some diols as chain extenders, in dioxane. The type of raw material was found to significantly affect the phase structure of the obtained polyurethane elastomers and to control physical interactions within those structures, thus influencing the SFE values. Fundamental reduction in the SFE value of a coating below 28 mJ/m2 was achieved by the use of 2,2,3,3-tetrafluoro-1,4-butanediol as the urethane prepolymer chain extender.