Peel-strength behavior of bilayer thermal-sprayed polymer coatings
Peel-strength behavior of bilayer thermal-sprayed polymer coatings
复制标题
双层热喷涂聚合物涂层的剥离强度行为
DOI：
10.1002/app.11648
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发表时间：
2003
影响因子：
3
通讯作者：
C. Berndt
中科院分区：
文献类型：
--
作者：
Fengyuan Yan;K. Gross;G. Simon;C. Berndt
我们通过热喷涂工艺在一定的预热温度范围内制备了乙烯甲基丙烯酸（EMAA）共聚物和离聚物的各种双层聚合物涂层，以研究它们的修复能力。采用差示扫描量热仪、X射线衍射仪、扫描电子显微镜和力学性能测试仪对涂层的热性能、结晶度、微观结构和界面强度进行了研究。工艺参数影响涂层的最终形态结构。随着最终温度的升高，涂层的结晶度增加，而涂层密度降低。密度的降低归因于在喷涂过程中在涂层中形成的尺寸为250 μ m的气泡的出现。对于在金属基底上的聚合物单层涂层，较高的PT产生较大的涂层与基底的接触面积。EMAA离聚体对钢的附着力始终低于EMAA共聚物对钢的附着力。这可能在很大程度上是由于聚合物和钢之间的界面粘合力由强的二次键相互作用主导。实验结果还表明，对于大于100°C的PT，聚合物之间的剥离强度比聚合物与钢基材之间的剥离强度强至少两倍。离聚物与共聚物混合双层膜的剥离强度最高.塑料层之间的界面在扫描电子显微镜下在较低的PT下清晰可见，随着PT的增加变得更加扩散。在此基础上，用焊点的形成解释了聚合物间的粘接机理。© 2003 Wiley Periodicals，Inc. J Appl Polym Sci 88：214 - 226，2003
We prepared various bilayer polymer coat- ings of ethylene methacrylic acid (EMAA) copolymer and ionomer by the thermal-spray process under a range of preheat temperatures (PTs) to investigate their ability to be repaired. The thermal properties, crystallinity, microstruc- ture, and interface strength of the coatings were investigated with differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and mechanical testing. Pro- cessing parameters influenced the final morphological struc- ture of the coatings. The crystallinity of the coatings in- creased with a higher final temperature, whereas the coating density decreased. The decrease in density was attributed to the appearance of bubbles, 250 m in size, formed in the coatings during the spray process. For the monolayer coat- ing of polymer on a metal substrate, a higher PT produced a greater contact area of the coating to the substrate. The adhesion of EMAA ionomer to steel was always lower than that of EMAA copolymer to steel. This may have been largely due to the interfacial adhesion between the polymer and steel being dominated by strong secondary bond inter- actions. Experimental results also indicate that the peel strength between polymers was at least twofold stronger than that between the polymer and the steel substrate for PTs greater than 100°C. The mixed bilayer coating of iono- mer on copolymer produced the highest peel strength. The interface between the plastic layers was clearly visible under the scanning electron microscope at lower PTs, becoming more diffuse with an increase in PT. On the basis of these observations, the adhesion mechanism between polymers was explained by the formation of welding points. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 214 -226, 2003