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Scaling effect on the detachment of pressure-sensitive adhesives through fibrillation characterized by a probe-tack test.
Soft Matter ( IF 2.9 ) Pub Date : 2020-06-23 , DOI: 10.1039/d0sm00680g Kosuke Takahashi 1 , Ryuto Oda 2 , Kazuaki Inaba 2 , Kikuo Kishimoto 2
Soft Matter ( IF 2.9 ) Pub Date : 2020-06-23 , DOI: 10.1039/d0sm00680g Kosuke Takahashi 1 , Ryuto Oda 2 , Kazuaki Inaba 2 , Kikuo Kishimoto 2
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This study extensively investigates the fibrillation process of a pressure-sensitive adhesive (PSA) using a probe-tack test. It was conducted using a glass sphere at the millimeter scale for various thicknesses of PSA layers laminated on a glass substrate, on various contact areas. A sharp decrease in the adhesion force caused by cavity growth was confirmed in the case of large contact areas, whereas cavities were not generated in the case of small contact areas on the thick PSA layer. Furthermore, an atomic force microscopy (AFM) cantilever was used to conduct a probe-tack test on considerably smaller contact areas at the micrometer scale, to focus on the fibrillation process by avoiding the cavity-growth. The transition of the adhesion force during the release process by the AFM cantilever was confirmed to resemble the transition in the fibrillation process obtained using the glass sphere by the repeated tests using the probe without cleaning the surface. The fully adhesive failure was also confirmed by the tests at sufficiently high release velocity. A comparison of these tests at different scales revealed that the detachment force from the probe at the millimeter scale is proportional to the contact area, and determined using the release-strain rate through elongation of the entire thickness of the PSA layer. By contrast, the detachment force from the AFM cantilever is proportional to the contact radius and determined using the release velocity regardless of the PSA thickness.
中文翻译：
通过原纤化试验以特征在于通过原纤化对压敏胶粘剂剥离的结垢效应。
这项研究使用探针粘性试验广泛研究了压敏胶（PSA）的原纤化过程。使用毫米级的玻璃球对层压在玻璃基板上的各种厚度的PSA层在各种接触区域上进行。在大的接触面积的情况下，确认了由空穴生长引起的粘附力的急剧降低，而在厚的PSA层上的小接触区域的情况下，没有产生空穴。此外，原子力显微镜（AFM）悬臂被用于在微米级的相当小的接触区域上进行探针粘性试验，从而通过避免空穴的增长而专注于原纤化过程。通过使用探针的反复测试，无需清洁表面，就证实了AFM悬臂在释放过程中的粘附力的转变类似于在使用玻璃球获得的原纤化过程中的转变。通过在足够高的释放速度下的测试也证实了完全粘合失败。在不同比例下对这些测试进行比较后发现，在毫米范围内从探针上的脱离力与接触面积成正比，并使用通过拉长PSA层整个厚度的释放应变率来确定。相比之下，与AFM悬臂的分离力与接触半径成正比，并且无论PSA厚度如何，均使用释放速度来确定。
更新日期：2020-07-22
中文翻译：
通过原纤化试验以特征在于通过原纤化对压敏胶粘剂剥离的结垢效应。
这项研究使用探针粘性试验广泛研究了压敏胶（PSA）的原纤化过程。使用毫米级的玻璃球对层压在玻璃基板上的各种厚度的PSA层在各种接触区域上进行。在大的接触面积的情况下，确认了由空穴生长引起的粘附力的急剧降低，而在厚的PSA层上的小接触区域的情况下，没有产生空穴。此外，原子力显微镜（AFM）悬臂被用于在微米级的相当小的接触区域上进行探针粘性试验，从而通过避免空穴的增长而专注于原纤化过程。通过使用探针的反复测试，无需清洁表面，就证实了AFM悬臂在释放过程中的粘附力的转变类似于在使用玻璃球获得的原纤化过程中的转变。通过在足够高的释放速度下的测试也证实了完全粘合失败。在不同比例下对这些测试进行比较后发现，在毫米范围内从探针上的脱离力与接触面积成正比，并使用通过拉长PSA层整个厚度的释放应变率来确定。相比之下，与AFM悬臂的分离力与接触半径成正比，并且无论PSA厚度如何，均使用释放速度来确定。
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