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首页> 美国卫生研究院文献>Springer Open Choice >Modelling the surface free energy parameters of polyurethane coats—part 1. Solvent-based coats obtained from linear polyurethane elastomers
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Modelling the surface free energy parameters of polyurethane coats—part 1. Solvent-based coats obtained from linear polyurethane elastomers

机译：聚氨酯涂料的表面自由能参数建模-第1部分。由线性聚氨酯弹性体获得的溶剂型涂料

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摘要

Polyurethane elastomers coating were synthesised by using typical diisocyanates, polyether and polyester polyols and HO-tertiary amines or diols as a chain extenders. Mole fractions of structural fragments (κexp) responsible for the polar interactions within polyurethane chains were calculated by 1H NMR method. Obtained results were confronted with the analogous parameter values (κtheor) calculated on the basis of process stoichiometry, considering the stage of the production of isocyanate prepolymers and reaction of their extension for polyurethanes. Trials of linear correlation between the κexp parameters and surface free energy (SFE) values of investigated coatings were presented. SFE values were determined by Owens–Wendt method, using contact angles measured with the goniometric method. Based on achieved results, another empirical models, allowing for prediction the influence of the kind of polyurethane raw materials on SFE values of received coatings were determined. It was found that it is possible to regulate the SFE in the range millijoules per cubic metre by the selection of appropriate substrates. It has been found that use of 2,2,3,3-tetrafluoro-1,4-butanediol as a fluorinated extender of prepolymer chains is essential to obtain coatings with increased hydrophobicity, applied among others as biomaterials—next to diphenylmethane diisocyanate and polyoxyethylene glycol.
机译：聚氨酯弹性体涂料是通过使用典型的二异氰酸酯，聚醚和聚酯多元醇以及HO-叔胺或二醇作为扩链剂合成的。用 1 1 H NMR方法计算了负责聚氨酯链内极性相互作用的结构片段的摩尔分数（κexp）。考虑到异氰酸酯预聚物的生产阶段及其对聚氨酯的扩展反应，在过程化学计量的基础上计算出的相似参数值（κtheor）面临获得的结果。提出了实验研究的涂层的κexp参数和表面自由能（SFE）值之间的线性相关性的试验。 SFE值由Owens-Wendt方法确定，并使用测角法测量接触角。基于获得的结果，确定了另一个可以预测聚氨酯原料种类对所接收涂料的SFE值的影响的经验模型。发现可以通过选择合适的底物将SFE调节在每立方米毫焦耳的范围内。已经发现，使用2,2,3,3-四氟-1,4-丁二醇作为预聚物链的氟化增量剂对于获得具有增强的疏水性的涂料是至关重要的，尤其是作为生物材料应用的涂料，仅次于二苯基甲烷二异氰酸酯和聚氧乙烯。乙二醇。

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