In this study, bending reliability of the surface mounted devices (SMD) attached using isotropic conductive adhesive (ICAs) on screen printed stretchable devices polyurethane substrate are investigated. The performance of polyurethane and polyurethane-acrylic ICAs and the impact of rolling speed are studied. The rolling test was performed using the customized automatic rolling test device. It was found that the polyurethane-acrylic blend gives poorer adhesion with the silver conductor and very high cohesive force. The polyurethane resin brings adhesive high adhesive force with the silver conductive layer while lower adhesion with the Tin surface of the SMD, and it exhibited poorer cohesive force. The resistance of all samples experienced a steady and slow increase period before it accelerated to failure. During the slow and steady increase phase, the increased resistance was mainly from the conductive layer, whereas during the dramatic increase phase, it was mainly from the ICA connected area. The increased rolling speed had accelerated the resistance evolution process and lowered the samples' reliability severely. It also lowered the adhesion of the polyurethane-acrylic blend with the ink layer and lowered cohesive force of polyurethane ICA.

在这项研究中，研究了在丝网印刷的可拉伸设备聚氨酯基材上使用各向同性导电胶粘剂（ICAs）附着的表面安装设备（SMD）的弯曲可靠性。研究了聚氨酯和聚氨酯丙烯酸ICA的性能以及轧制速度的影响。使用定制的自动轧制测试装置进行轧制测试。已经发现，聚氨酯-丙烯酸共混物与银导体的粘合性较差，并且内聚力非常高。聚氨酯树脂使与银导电层的粘合力高，而与SMD的锡表面的粘合力低，显示出较弱的内聚力。在加速失败之前，所有样品的电阻经历了稳定且缓慢的增加期。在缓慢而稳定的增长阶段，电阻增加主要来自导电层，而在急剧增加阶段，主要来自ICA连接区域。轧制速度的提高加速了电阻的演变过程，并严重降低了样品的可靠性。这也降低了聚氨酯-丙烯酸共混物与油墨层的粘合性，并降低了聚氨酯ICA的内聚力。