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A comparison of the strength of autohesion of plasma treated amorphous and semi-crystalline PEEK films

机译：等离子体处理的非晶态和半晶态PEEK薄膜自粘强度的比较

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摘要

Polyether ether ketone (PEEK) is a promising material for the encapsulation of electronic components for medical implants but a strong and hermetic joining technology is required. Autohesion is a self-bonding method that avoids the need for adhesives. The strengths of autohesive joins using amorphous and semi-crystalline PEEK films after surface activation using RF plasma were compared. Both types of PEEK films showed successful autohesion after activation with the bond strength of the amorphous sample being twice as high as the bond strength of the semi-crystalline sample. Plasma treatment increased the autohesion strength of PEEK with no observed change in surface roughness (as measured by profilometer). The water contact angle was reduced by the treatment. X-ray photoelectron spectroscopy (XPS) was carried out to determine surface chemistry. In the case of the semi-crystalline surface, plasma treatment increased the relative percentage of C-O functional groups compared to the untreated surface. For treated surfaces nitrogen concentration correlated positively with bond strength while oxygen concentration correlated negatively with the semi-crystalline PEEK samples and positively with the amorphous PEEK samples. The oxygen groups most likely are formed after the treatment by ambient oxidation are not conducive to bond formation, possibly because of the quenching of radicals that would otherwise form links.
机译：聚醚醚酮（PEEK）是用于医疗植入物的电子部件封装的一种有前途的材料，但是需要一种牢固而密封的连接技术。自粘是一种自粘方法，可避免使用粘合剂。比较了使用射频等离子体进行表面活化后，使用非晶态和半晶态PEEK膜的自粘连接强度。两种类型的PEEK膜在活化后均显示出成功的自粘性，其中无定形样品的结合强度是半结晶样品的结合强度的两倍。等离子体处理提高了PEEK的自粘强度，但未观察到表面粗糙度的变化（通过轮廓仪测量）。通过该处理，水接触角减小。进行X射线光电子能谱法（XPS）以确定表面化学性质。在半结晶表面的情况下，与未处理的表面相比，等离子体处理增加了C-O官能团的相对百分比。对于处理过的表面，氮浓度与结合强度呈正相关，而氧浓度与半结晶性PEEK样品呈负相关，而与非晶态PEEK样品呈正相关。最有可能在环境氧化处理后形成的氧基不利于键的形成，这可能是由于自由基的淬灭，否则自由基会形成键。

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