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Study on orientation in EVA/Fe3O4 composite hot-melt adhesives

机译:EVA / Fe3O4复合热熔胶的取向研究

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EVA hot melt adhesives have tackiness to both external anticorrosion coating made by cross-linked polyethylene and iron-base petroleum pipeline. But, traditional EVA hot melt adhesives cannot meet the requirement of external anticorrosion coating for weaker tackiness. Two types of Fe3O4 particles with different particle sizes and magnetic strengths were added in adhesives. One is of 3.665 μm ~(Laser panicle size analyzer (LPSA)) and 8.403 x 10~1 emu/g~(vibrating sample magnetometer (VSM)) and the other one is of 0.426 μm~(LPSA) and 3.997 x 10~1 emu/g~(VSM). The result of peel test indicated that peel strength of composite adhesives increased as Fe3O4 content increased when particles size was 3.665 μm~(LPSA) but the tackiness of composite adhesive decreased as Fe3O4 content increased when particles size was 0.426 μm~(LPSA). Also, microphotos of SEM revealed that the composite adhesive with 3.665 μm~(LPSA) Fe3O4 was more likely to distribute in a region near the tackiness surface between the adhesive and iron layers, but the one with 0.426 μm~(LPSA) Fe3O4 was more likely to aggregate in the middle region of adhesive. The movement of 3.665 μm~(LPSA),Fe3O4 particles could induce EVA molar chain orientation and this orientation was confirmed by infrared dichroism and XRD. Results of infrared dichroism and XRD showed that the orientation degree of EVA increased as 3.665 μm~(LPSA) Fe3O4 content increased. Furthermore, crystallinity tests by XRD and DSC indicated that crystallinity of PE segment of EVA also increased as 3.665 μm~(LPSA) Fe3O4 content increased, which could support increase of orientation tested by infrared dichroism and XRD.
机译:EVA热熔胶对交联聚乙烯制成的外部防腐涂层和铁基石油管道均具有粘性。但是,传统的EVA热熔胶不能满足外部防腐涂层对粘性较弱的要求。在粘合剂中添加了两种具有不同粒径和磁强度的Fe3O4颗粒。一种是3.665μm〜(激光穗尺寸分析仪(LPSA))和8.403 x 10〜1 emu / g〜(振动样品磁力计(VSM)),另一种是0.426μm〜(LPSA)和3.997 x 10〜 1 emu / g〜(VSM)。剥离试验结果表明,当粒径为3.665μm〜(LPSA)时,复合胶粘剂的剥离强度随Fe3O4含量的增加而增加,而当粒径为0.426μm〜(LPSA)时,复合胶粘剂的粘性随Fe3O4含量的增加而降低。另外,扫描电镜的显微照片显示,具有3.665μm〜(LPSA)Fe3O4的复合粘合剂更可能分布在粘合剂和铁层之间的粘性表面附近区域,而具有0.426μm〜(LPSA)Fe3O4的复合粘合剂则更多。可能会在粘合剂的中间区域聚集。 3.665μm〜(LPSA),Fe3O4粒子的运动可引起EVA摩尔链取向,红外二向色性和XRD证实了该取向。红外二色性和X射线衍射结果表明,EVA的取向度随3.665μm〜(LPSA)Fe3O4含量的增加而增加。 XRD和DSC的结晶度测试表明,EVA的PE链段的结晶度也随着3.665μm〜(LPSA)Fe3O4含量的增加而增加,这可以支持红外二色性和XRD测试的取向的增加。

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