Acrylic pressure sensitive adhesives (PSAs) are the most widely used and play a crucial role in ensuring the stable operation of foldable displays. With a focus on product sustainability, numerous studies have aimed to enhance eco‐friendliness of acrylic PSAs. However, few studies specifically address the development of environmentally friendly acrylic PSAs for foldable devices. In this work, we synthesized new monomers by modifying citronellol, a terpenoid, for use as functional monomers and low glass transition temperature (Tg) monomers in acrylic optical clear adhesives (OCAs). We prepared OCAs using these monomers via an environmentally friendly visible‐light‐driven polymerization process due to its greater energy efficiency and reduced harm to humans, as opposed to the ultraviolet light that is normally used in conventional photopolymerization processes. Their properties were confirmed through rheological analysis. The resultant OCAs exhibit low Tg, appropriate storage modulus across a wide temperature range, reliable adhesion force to various substrates, and decent creep and recovery properties. These characteristics indicate their potential to enhance the eco‐friendliness of foldable devices.

中文翻译：

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用于可折叠显示器的生物质衍生光学透明粘合剂

丙烯酸压敏胶（PSA）应用最广泛，在确保可折叠显示器的稳定运行方面发挥着至关重要的作用。出于对产品可持续性的关注，大量研究旨在提高丙烯酸压敏胶的环保性。然而，很少有研究专门针对可折叠设备的环保丙烯酸压敏胶的开发。在这项工作中，我们通过改性香茅醇（一种萜类化合物）合成了新的单体，用作丙烯酸光学透明粘合剂（OCA）中的功能单体和低玻璃化转变温度（Tg）单体。我们使用这些单体通过环保的可见光驱动聚合工艺制备 OCA，与传统光聚合工艺中通常使用的紫外线相比，该工艺具有更高的能源效率并减少对人类的伤害。它们的特性通过流变分析得到证实。所得 OCA 表现出低 Tg、在宽温度范围内适当的储能模量、对各种基材的可靠粘合力以及良好的蠕变和恢复性能。这些特性表明它们有增强可折叠设备环保性的潜力。