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首页> 外文期刊>Journal of Applied Polymer Science >Peel-strength Behavior of bilayer thermal-sprayed polymer coatings
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Peel-strength Behavior of bilayer thermal-sprayed polymer coatings

机译：双层热喷涂聚合物涂层的剥离强度行为

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We prepared various bilayer polymer coatings 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, microstructure, and interface strength of the coatings were investigated with differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and mechanical testing. Processing parameters influenced the final morphological structure of the coatings. The crystallinity of the coatings increased with a higher final temperature, whereas the coating density decreased. The decrease in density was attributed to the appearance of bubbles, 250 mum in size, formed in the coatings during the spray process. For the monolayer coating 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 interactions. 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 100degreesC. The mixed bilayer coating of ionomer 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. (C) 2003 Wiley Periodicals, Inc. [References: 29]
机译：我们在一定的预热温度（PTs）下，通过热喷涂工艺制备了乙烯甲基丙烯酸（EMAA）共聚物和离聚物的双层聚合物涂料，以研究其修复能力。通过差示扫描量热法，X射线衍射，扫描电子显微镜和机械测试研究了涂层的热性能，结晶度，微观结构和界面强度。加工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大小为250微米的气泡的出现。对于金属基底上的聚合物的单层涂层，较高的PT产生涂层与基底的更大接触面积。 EMAA离聚物对钢的粘附力始终低于EMAA共聚物对钢的粘附力。这可能主要是由于聚合物和钢之间的界面粘合主要由强烈的次级键相互作用所主导。实验结果还表明，对于大于100摄氏度的PT，聚合物之间的剥离强度至少比聚合物与钢基材之间的剥离强度强两倍。离聚物在共聚物上的混合双层涂层产生了最高的剥离强度。在较低的PT下，在扫描电子显微镜下，塑料层之间的界面清晰可见，随着PT的增加而变得更加分散。基于这些观察，通过焊接点的形成解释了聚合物之间的粘附机理。 （C）2003 Wiley Periodicals，Inc. [参考：29]

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