Diffusiophoresis-Driven Stratification in Pressure-Sensitive Adhesive Films from Bimodal Waterborne Colloids.
Diffusiophoresis-Driven Stratification in Pressure-Sensitive Adhesive Films from Bimodal Waterborne Colloids.
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DOI：
10.1021/acsapm.2c02044
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发表时间：
2023-02-10
影响因子：
5
通讯作者：
Keddie, Joseph L.
中科院分区：
文献类型：
--
作者：
Palmer, Toby R.;van der Kooij, Hanne M.;Bakar, Rohani Abu;McAleese, Callum D.;Duewel, Mathis;Greiner, Katja;Couture, Pierre;Sharpe, Matthew K.;Keddie, Joseph L.
关键词：
压敏粘合剂（PSA）的用途广泛，应用包括标签、胶带和图形。为了实现良好的粘附性，PSA必须表现出粘性和弹性性质的平衡。先前的研究发现，与单层相比，在较软的耗散层顶部的薄弹性表面层会产生更大的粘性粘附力。上级性能是通过连续沉积获得的双层来实现的，连续沉积消耗能量和时间。为了通过单一沉积工艺实现多层结构，我们具有两种不同尺寸的水性胶体聚合物颗粒的分层混合物：大的聚（丙烯酸酯）粘合剂颗粒（约100 μ m），660 nm直径）和小聚（丙烯酸丁酯）（pBA）颗粒（约。100 nm）。我们在颗粒内使用了两种类型的pBA：没有添加交联剂的粘弹性pBA或具有完全交联网络的弹性pBA。通过弹性反冲检测发现了厚度至少为1 μm的氘标记pBA颗粒的分层表面层，并通过表面形貌分析进行了定性验证。分层的程度随蒸发速率的增加而增加;干燥最慢的膜没有分层。这一结果与扩散电泳模型一致。当弹性的、交联的pBA颗粒在表面处分层时，粘性粘附性能从脆性失效转变为粘性。对于没有添加交联剂的PBA，所有粘合剂在脱粘过程中显示出原纤化，但当膜分层时，原纤化的程度增加。这些结果表明，PSA结构可以通过加工条件来控制，以实现增强的性能。这项研究将有助于未来的发展分层或梯度单沉积PSA与设计的粘合性能。
The uses of pressure-sensitive adhesives (PSAs) are wide ranging, with applications including labels, tapes, and graphics. To achieve good adhesion, a PSA must exhibit a balance of viscous and elastic properties. Previous research has found that a thin, elastic surface layer on top of a softer, dissipative layer resulted in greater tack adhesion compared with the single layers. Superior properties were achieved through a bilayer obtained via successive depositions, which consume energy and time. To achieve a multilayered structure via a single deposition process, we have stratified mixtures of waterborne colloidal polymer particles with two different sizes: large poly(acrylate) adhesive particles (ca. 660 nm in diameter) and small poly(butyl acrylate) (pBA) particles (ca. 100 nm). We used two types of pBA within the particles: either viscoelastic pBA without an added cross-linker or elastic pBA with a fully cross-linked network. Stratified surface layers of deuterium-labeled pBA particles with thicknesses of at least 1 μm were found via elastic recoil detection and qualitatively verified via the analysis of surface topography. The extent of stratification increased with the evaporation rate; films that were dried slowest exhibited no stratification. This result is consistent with a model of diffusiophoresis. When the elastic, cross-linked pBA particles were stratified at the surface, the tack adhesion properties made a transition from brittle failure to tacky. For pBA without an added cross-linker, all adhesives showed fibrillation during debonding, but the extent of fibrillation increased when the films were stratified. These results demonstrate that the PSA structure can be controlled through the processing conditions to achieve enhanced properties. This research will aid the future development of layered or graded single-deposition PSAs with designed adhesive properties.
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