Through a strategic polymer engineering design, this paper shows that self-immolative poly(phthalaldehyde) (PPA) can be employed as a responsive debonding-on-demand adhesive for the detection of fluorides and acids in liquid and solid states. The engineered PPA with dimethyl phthalate plasticizer blends exhibits mechanical shear strength up to 1100 kPa when bonding smooth glass surfaces, which represents a significant enhancement compared to the o-phthalaldehyde monomer (12 kPa) and the pristine PPA polymer (up to 400 kPa). Exposure of acetyl-endcapped PPA to 8.0 eq. of trifluoroacetic acid (TFA) under ambient conditions resulted in a complete degradation of the polymer within 25 minutes via a backbone cleavage, whereas exposure of fluoride responsive silyl-ether endcapped PPA to 1.0 eq. of tetrabutylammonium fluoride (TBAF) resulted in a fast and simultaneous decomposition of the polymer within 2 minutes via end-cap cleavage. This study also illustrates the capability of PPA to undergo solid-state depolymerization, promoting on-demand release from adhesion. Overall, this study offers a unique design strategy for creating on-demand depolymerizable coatings that may find future potential applications in stimuli-responsive personal protective equipment (PPE) for the chemical detection and on-demand protection against chemical warfare agents (CWAs) in hostile environments.

中文翻译：

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刺激响应型聚邻苯二甲醛粘合剂的功能设计：通过添加增塑剂进行解聚动力学和机械强度管理

通过战略性聚合物工程设计，本文表明自燃聚邻苯二甲醛（PPA）可用作响应性按需脱粘粘合剂，用于检测液态和固态的氟化物和酸。当粘合光滑玻璃表面时，含有邻苯二甲酸二甲酯增塑剂混合物的工程 PPA 表现出高达 1100 kPa 的机械剪切强度，与邻苯二甲醛单体 (12 kPa) 和原始 PPA 聚合物（高达 400 kPa）相比，机械剪切强度显着增强。乙酰基封端的 PPA 暴露于 8.0 eq.在环境条件下加入三氟乙酸 (TFA) 会导致聚合物在 25 分钟内通过主链裂解完全降解，而氟化物响应性甲硅烷基醚封端 PPA 暴露于 1.0 eq.四丁基氟化铵 (TBAF) 导致聚合物在 2 分钟内通过端盖裂解快速同时分解。这项研究还说明了 PPA 进行固态解聚的能力，促进按需释放粘附力。总体而言，这项研究提供了一种独特的设计策略，用于创建按需可解聚涂层，未来可能在刺激响应个人防护装备（PPE）中找到潜在应用，用于敌对环境中的化学检测和针对化学战剂（CWA）的按需防护环境。