动态毛吸法测定纤维及粉末料的接触角研究
THE STUDIES OF DETERMINING CONTACT ANGLE OF FIBERS AND POWDER FILLER BY THE DYNAMIC METHOD OF WICKING
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摘要: 本文用动态毛吸法研究了表面处理对纤维浸润性的影响,结果表明碳纤维及聚酯纤维表面经冷等离子体氧处理,浸润性有很大的改善,碳纤维约提高四倍,这是因为等离子氧表面处理过程,将含氧基团羧基,羟基及羰基等引入到表面所致。同时从测得的浸润过程表面自由能改变值△γ,计算出水对纤维的接触角,它与采用接触角测定仪倾斜法所测得的结果基本上一致。从所测得的接触角值也可以看出表面经处理之后,浸润性得以改善。如碳纤维由77°降为63°,聚酯纤维由77°降为52°。此外我们还研究了煤粉和玻璃粉体系对水的浸润性,发现水对玻璃粉的浸润性优于煤粉,前者的浸润接触角为47°、后者则为90°,此接触角值也与采用接触角测定仪由静滴法测得水对片材的接触角相一致。由此可见动态毛吸法可以用于研究纤维及粉末体系的浸润性,而且操作简单易行,测试周期短。Abstract: This pager studies on the effect of surface treatment on the wettability of fibers by the dynamic method of wickiag.The results show that the wettability has got a great improvement after the fiber surface is treated by cold plasma.That is because oxygen-containing groups (-COOH,=C-OH and =C=O).are introduced onto the surface.At the same time,the contact angle of fiber/water has been calculated by messuring the difference of surface free energy (Δr) during the wetting process,which is close to the results obtained by using contact angle meter with tilting plate method.After the treatment,it can be seen from the measurement of contact angles that the wettability has been improved,For instance,the eontact angle of carbon fibers/water has been decreased from 17°to 83°and polyester fibers/water from 77°to 52°after they are treated by cold plasma oxygen.Besides,the wettability of water to coal powder system and to glass powder system are studied.It is found that the ettabilty of water/glass powder is better than that of water/coal powder,The wetting contact angle of the former is 47°and the later is 90°.These values of contact angle are also correspondent to those between water and flakes,which are measured by the use of contact angle meter in sessile drop method,From those aforementioned,it's clear that the dynamic method of wicking can be used to measure the wettability of fibers and powder systems,while its operation is easy and only takes a short period.
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