The reuse of multi-layered materials, which are held together by adhesives, has been identified as a major issue. In this research, we explored an external catalyst-free transesterification chemistry for thermally triggered, on-demand debondable adhesives that are prepared by reacting readily available (macromolecular) diols through a one-step process with a rubbery polyisoprene-graft-maleic anhydride matrix. The research starts with a systematic study investigating how the architecture of the diol, the flexibility of its backbone, and the presence of mildly basic compounds affected the rate and quality of network formation. The dynamic behaviour of the most promising formulations is then characterised, after which pressure-sensitive adhesive (PSA) specimens have been made to test the potential for on-demand debonding via temperature-controlled static shear tests. The debonding process is solely triggered by an increase in temperature (T > 100 °C), ensuring the approach is non-destructive and industrially feasible. The herein reported drop-in method thus provides a starting point for the development of a new class of rubber-based adhesives that should be able to bond as well as debond various substrates such as metals and plastics.

中文翻译：

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具有动态交联的聚异戊二烯基压敏粘合剂

通过粘合剂粘合在一起的多层材料的重复使用已被认为是一个主要问题。在这项研究中，我们探索了一种用于热触发、按需可脱粘粘合剂的无外部催化剂的酯交换化学，该粘合剂是通过一步法使容易获得的（大分子）二醇与橡胶状聚异戊二烯-接枝-马来酸酐基质反应而制备的。该研究首先进行系统研究，调查二醇的结构、主链的灵活性以及弱碱性化合物的存在如何影响网络形成的速率和质量。然后对最有前途的配方的动态行为进行表征，然后制作压敏粘合剂（PSA）样本，通过温控静态剪切测试来测试按需脱粘的潜力。脱粘过程仅由温度升高 (T > 100 °C) 触发，确保该方法是非破坏性的且在工业上可行。因此，本文报道的直接方法为开发新型橡胶基粘合剂提供了一个起点，这种粘合剂应该能够粘合以及脱粘各种基材，例如金属和塑料。