dataphysics接触角测量仪OCA20

研究了木塑复合材料在氙灯加速老化环境老化后的性能变化。结果表明,材料老化后表面发生褪色现象,弯曲强度和弯曲弹性模量分别损失10%和20%。通过扫描电子显微镜可以看出材料老化后表面出现微孔和细小裂缝,表面细长物质增多。接触角测试则证明了老化50 h后增多的细长物质为木粉,老化75 h和100 h后增多的细长物质为HDPE老化断链后的低分子物。通过X射线光电子能谱对材料表面元素状态及含量的变化分析可知,老化后材料表面发生了氧化。 关键词　木塑复合材料　接触角　X射线光电子能谱分析

研究了木塑复合材料在氙灯加速老化环境老化后的性能变化。结果表明,材料老化后表面发生褪色现象,弯曲强度和弯曲弹性模量分别损失10%和20%。通过扫描电子显微镜可以看出材料老化后表面出现微孔和细小裂缝,表面细长物质增多。接触角测试则证明了老化50 h后增多的细长物质为木粉,老化75 h和100 h后增多的细长物质为HDPE老化断链后的低分子物。通过X射线光电子能谱对材料表面元素状态及含量的变化分析可知,老化后材料表面发生了氧化。 关键词　木塑复合材料　老化性能　

在室温条件下, 利用KrF 准分子激光辐照技术, 实现了超疏水性聚偏氟乙烯高分子材料的快速制备, 最快制备时间为10 s。实验结果表明, 在改性后的材料表面上, 与水静态接触角由原来的53􀀂增加到170􀀂 左右。采用原子力显微镜和X 射线光电子能谱等检测手段对辐照后的材料表面进行了微观形貌和化学结构分析, 结果表明激光辐照区域产生了具有极规整三维网络结构的改性层, 并且C - CF2 和C- F 两种化学基团取代了原有的化学结构CH 2 和CF2 成为该改性层的主体。表面的粗糙化与低表面能化学基团的共同作用, 使改性后的聚偏氟乙烯表面有效地产生了较强的超疏水性能。

The OCA20 and the software modules SCA2 and 21 offer an easy way to determine the surface energy of polymer surfaces. The polar portions of the surface energy responsible for the adhesion of coatings can be quantitatively collected by means of the contact angle measurement. In this way, wetting and adhesion properties can be predicted. Compared to the use of test inks to estimate the surface free energy, the present method has the advantage of providing a greater accuracy and let to additional information the polar and dispersive contribution of the surface free energy, which governs printability or adhesion. At the same time being independent of the experimenter, thus ruling out subjective influences.

The OCA20 offers an easy way of determining the surface energy of polymer surfaces. For the case of serial examinations on the same, only slightly modified materials as they often occur in industrial production, a method has been developed which further facilitates the determination of the surface energy. Here, the measurement of a contact angle with just one liquid is needed, thus considerably reducing the time needed. The example of PP films, which were submitted to different surface treatments, showed that the new method can predict the surface energy with an accuracy of 2﹪.

A method has been presented that simply and precisely establishes the surface tension between printing ink and fountain water. With the examples of coloured inks and fountain water, which are currently under further development in industry, it has been shown that an exact assessment of the surface tension limits between printing inks and fountain water is only possible if one establishes the exact surface tension. The over all surface tension alone is not enough to predict the relationship of liquids to each other.

The OCA20 and the software modules SCA2 and 21 offer an easy way to determine the surface energy of polymer surfaces. The polar portions of the surface energy responsible for the adhesion of coatings can be quantitatively collected by means of the contact angle measurement. In this way, wetting and adhesion properties can be predicted. Compared to the use of test inks to estimate the surface free energy, the present method has the advantage of providing a greater accuracy and let to additional information the polar and dispersive contribution of the surface free energy, which governs printability or adhesion. At the same time being independent of the experimenter, thus ruling out subjective influences.

A method has been presented that simply and precisely establishes the surface tension between printing ink and fountain water. With the examples of coloured inks and fountain water, which are currently under further development in industry, it has been shown that an exact assessment of the surface tension limits between printing inks and fountain water is only possible if one establishes the exact surface tension. The over all surface tension alone is not enough to predict the relationship of liquids to each other.

德国应用化学收录文章：在全PH值范围内的纳米结构化碳膜的超疏水性

The new DataPhysics lamella method was introduced, which permits the rapid and easy determination of the surface tension of liquids at temperatures up to 400℃. With the example of a high viscous hotmelt adhesive, an accuracy of the method of 1﹪was achieved.

For performing the contact angle, surface tension and interfacial tension measurements on the contact adhesives, the knowledge of certain liquid parameters against the temperature is required. For the liquids used as polar or disperse reference liquids, these data are available from DataPhysics instruments GmbH, Filderstadt, on request.

The new DataPhysics lamella method was introduced, which permits the rapid and easy determination of the surface tension of liquids at temperatures up to 400℃. With the example of a high viscous hotmelt adhesive, an accuracy of the method of 1﹪was achieved.