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首页> 外文期刊>Journal of Applied Polymer Science >Experimental investigation into the effect of adhesion properties of PEEK modified by atmospheric pressure plasma and low pressure plasma
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Experimental investigation into the effect of adhesion properties of PEEK modified by atmospheric pressure plasma and low pressure plasma

机译：大气压等离子体和低压等离子体改性PEEK附着性能影响的实验研究

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High performance polymer, Polyether Ether Ketone (PEEK) (service temperature-250°C to +300°C, tensile strength: 120 MPa) is gaining significant interest in aerospace and automotive industries. In this investigation, attention is given to understand adhesion properties of PEEK, when surface of the PEEK is modified by two different plasma processes (i) atmospheric pressure plasma and (ii) low pressure plasma under DC Glow Discharge. The PEEK sheets are fabricated by ultra high temperature resistant epoxy adhesive (DURALCO 4703, service temperature-260°C to +350°C). The surface of the PEEK is modified through atmospheric pressure plasma with 30 and 60 s of exposure and low pressure plasma with 30, 60, 120, 240, and 480 s of exposure. It is observed that polar component of surface energy leading to total surface energy of the polymer increases significantly when exposed to atmospheric pressure plasma. In the case of low pressure plasma, polar component of surface energy leading to total surface energy of the polymer increases with time of exposure up to 120 s and thereafter, it deteriorates with increasing time of exposure. The fractured surface of the adhesively bonded PEEK is examined under SEM. It is observed that unmodified PEEK fails essentially from the adhesive to PEEK interface resulting in low adhesive bond strength. In the case of surface modified PEEK under atmospheric pressure plasma, the failure is entirely from the PEEK and essentially tensile failure at the end of the overlap resulting in significant increase in adhesive bond strength.
机译：高性能聚合物聚醚醚酮（PEEK）（工作温度为250°C至+ 300°C，抗张强度：120 MPa）在航空航天和汽车工业中引起了广泛的关注。在此研究中，当通过两种不同的等离子体工艺（i）大气压等离子体和（ii）直流辉光放电下的低压等离子体对PEEK的表面进行改性时，应注意理解PEEK的粘附性能。 PEEK片材是由耐超高温环氧胶（DURALCO 4703，使用温度为260°C至+ 350°C）制成的。通过暴露30和60 s的大气压等离子体和暴露30、60、120、240和480 s的低压等离子体对PEEK的表面进行改性。观察到当暴露于大气压等离子体时，导致聚合物的总表面能的表面能的极性成分显着增加。在低压等离子体的情况下，导致聚合物的总表面能的表面能的极性成分随曝光时间的延长而增加，最高可达120 s，此后随着曝光时间的增加而恶化。在SEM下检查粘合的PEEK的断裂表面。观察到未改性的PEEK从粘合剂到PEEK的界面基本上失效，导致低的粘合剂粘合强度。在大气压等离子体下进行表面改性的PEEK的情况下，破坏完全来自PEEK，并且在重叠的末端基本上是拉伸破坏，从而导致粘合剂粘结强度的显着提高。

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