<br>具有可变氢键相互作用的新型（甲基）丙烯酸酯的合成及其在透明粘弹性薄膜中的应用,ACS Omega

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具有可变氢键相互作用的新型（甲基）丙烯酸酯的合成及其在透明粘弹性薄膜中的应用
ACS Omega ( IF 3.7 ) Pub Date : 2024-03-16 , DOI: 10.1021/acsomega.3c07566
Weizhong Xiang ₁ , Jianhui Xia ₁

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透明粘弹性薄膜 (CVF) 在显示行业有许多应用。含有氢键的丙烯酸单体（H-单体）通常用于制备CVF，以增加内聚力并与显示基板形成有利的相互作用。常见的 H 单体面临着玻璃化转变温度 ( T _g ) 和氢键缔合常数 ( Ka ₎之间的平衡。强氢键通常会导致高T _g和高模量，这在某些应用（例如可折叠显示器）中是不利的。_为了解决这些问题，很容易合成了具有不同Ka和Tg_的四种类型的氢键（甲基）丙烯酸单体（氨基甲酸酯丙烯酸酯、氨基甲酸酯甲基丙烯酸酯、脲丙烯酸酯和脲甲基丙烯酸酯）。其中，脲丙烯酸酯表现出最高的Ka _，_同时仍保持中等的Tg 。这些H-单体与丙烯酸2-乙基己酯(EHA)共聚并交联得到一系列共聚物(H-共聚物)作为压敏粘合剂。经过流变学、光学和剥离粘合力的表征后，脲-丙烯酸 H-共聚物结合了出色的光学性能（透光率 >98%，雾度 < 1%）和机械性能（8-12 N/剥离粘合力为 25 毫米，蠕变恢复率为 84–92%）。这项工作为制备用于柔性显示应用的丙烯酸CVF提供了一条新途径。

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Synthesis of Novel (Meth)acrylates with Variable Hydrogen Bond Interaction and Their Application in a Clear Viscoelastic Film

Clear viscoelastic films (CVFs) have many applications in the display industry. Acrylic monomers containing a hydrogen bond (H-monomer) are often used in the preparation of CVF to increase the cohesion and form favorable interactions with the display substrate. Common H-monomers face a counterbalance between the glass transition temperature (T_g) and the hydrogen-bonding association constant (K_a). Strong hydrogen bonding often leads to a high T_g and high modulus, which are unfavorable in certain applications such as foldable display. To solve these problems, four types of hydrogen-bonding (meth)acrylic monomers (carbamate acrylate, carbamate methacrylate, urea acrylate, and urea methacrylate) with different K_a and T_g were readily synthesized. Among them, urea acrylates displayed the highest K_a while still maintaining moderate T_g. These H-monomers were copolymerized with 2-ethylhexyl acrylate (EHA) and cross-linked to obtain a series of copolymers (H-copolymers) as pressure-sensitive adhesives. After the characterization of rheology, optics, and peel adhesion, urea-acrylic H-copolymers showed the best overall performance by combining great optical property (>98% in transmittance, < 1% in haze) and mechanical performance (8–12 N/25 mm in peel adhesion, 84–92% in creep recovery). This work provides a new path to prepare acrylic CVF for flexible display application.

更新日期：2024-03-16

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