Abstract With the development of mobile display shapes from flat to flexible, the conventional glass cover window must be replaced by a film-type window. However, film-type cover windows have low impact resistance owing to their poor shock absorption. Therefore, to realize their application to flexible displays, it is essential to characterize and improve the shock-absorbing characteristics of the display film. In this study, a semi-interpenetrating network (semi-IPN) acrylic pressure-sensitive adhesive (PSA) consisting of a crosslinked network structure with a linear acrylic polymer chain was developed. The influence of the multi-functional monomer content and UV dose on the properties of the semi-IPN PSA was studied. The peel strength of the semi-IPN PSA was higher than 10 N/25 mm, which is generally considered as the PSA standard for mobile displays. With an increase in crosslink density, the storage modulus increased, but the damping factor decreased. To evaluate shock absorption, a falling ball impact tester was used to estimate the shock absorption ratio (ΔF) of the film. The semi-IPN PSA incorporating 30 phr of the multi-functional monomer exhibited higher ΔF (31.2%) than that of a conventional UV-curable PSA film (24.6%). This shows that even with the relatively low damping factor of the semi-IPN PSA, its structure could improve shock absorption. Moreover, we suggested two mechanisms for shock absorption of the semi-IPN PSA, energy dissipation into the PSA layer and extended contact time.

中文翻译：

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移动显示器抗冲击半互穿网状亚克力压敏胶的减震效果

摘要 随着移动显示形状从扁平化向柔性化发展，传统的玻璃盖板窗口必须被薄膜式窗口所取代。然而，薄膜型覆盖窗由于其减震性差而具有较低的抗冲击性。因此，要实现其在柔性显示器上的应用，必须表征和改进显示膜的减震特性。在这项研究中，开发了一种半互穿网络 (semi-IPN) 丙烯酸压敏胶 (PSA)，由具有线性丙烯酸聚合物链的交联网络结构组成。研究了多功能单体含量和UV剂量对半IPN PSA性能的影响。半IPN PSA的剥离强度高于10 N/25 mm，这通常被认为是移动显示器的 PSA 标准。随着交联密度的增加，储能模量增加，但阻尼系数降低。为了评估减震性，使用落球冲击试验机来估计薄膜的减震率（ΔF）。包含 30 份多功能单体的半 IPN PSA 表现出比传统 UV 可固化 PSA 薄膜（24.6%）更高的 ΔF（31.2%）。这表明即使半IPN PSA的阻尼系数相对较低，其结构也可以提高减震效果。此外，我们提出了两种半 IPN PSA 的减震机制，将能量耗散到 PSA 层和延长接触时间。为了评估减震性，使用落球冲击试验机来估计薄膜的减震率（ΔF）。包含 30 份多功能单体的半 IPN PSA 表现出比传统 UV 可固化 PSA 薄膜（24.6%）更高的 ΔF（31.2%）。这表明即使半IPN PSA的阻尼系数相对较低，其结构也可以提高减震效果。此外，我们提出了两种半 IPN PSA 的减震机制，将能量耗散到 PSA 层和延长接触时间。为了评估减震性，使用落球冲击试验机来估计薄膜的减震率（ΔF）。包含 30 份多功能单体的半 IPN PSA 表现出比传统 UV 可固化 PSA 薄膜（24.6%）更高的 ΔF（31.2%）。这表明即使半IPN PSA的阻尼系数相对较低，其结构也可以提高减震效果。此外，我们提出了两种半 IPN PSA 的减震机制，将能量耗散到 PSA 层和延长接触时间。这表明即使半IPN PSA的阻尼系数相对较低，其结构也可以提高减震效果。此外，我们提出了两种半 IPN PSA 的减震机制，将能量耗散到 PSA 层和延长接触时间。这表明即使半IPN PSA的阻尼系数相对较低，其结构也可以提高减震效果。此外，我们提出了两种半 IPN PSA 的减震机制，将能量耗散到 PSA 层和延长接触时间。