Optimization of the performance of UV light-responsive curing of polyurethane-urea adhesive formulations

IF 4.1 2区化学 Q2 POLYMER SCIENCE Polymer Pub Date : 2024-08-10 DOI:10.1016/j.polymer.2024.127479

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Abstract

UV-light curing polyurethane-urea adhesives (PU-urea) were formulated from 4,4′-methylenediphenyl diisocyanate (MDI), 1,5-pentanediol (PD), 1,5-pentanediamine (cadaverine, CAD), and acetone as the adhesive carrier. The UV light-triggered curing process of these PU-urea formulations was controlled by blocking hydroxyl and amine functional groups of PD and CAD, respectively, with 6-nitroveratryloxycarbonyl (NVoc) as a photo-labile protecting group. The adhesive formulation was proven to undergo a dual curing procedure, integrating the UV light-induced polymerization and the release of the volatile adhesive carrier. This study highlights the critical role of the urethane:urea linkage ratio in the synthesis of photo-triggered adhesives to achieve optimal performance. Hence, the formulation with a NCO:OH:NH₂ molar ratio of 2.6:1.0:0.5 and a 96 % acetone content exhibited the most appropriate mechanical response in PETG-adhesive-PETG joints. Upon 60 min of photo-curing process (180 mW cm⁻²) shear strength values of around 6.11 MPa, in combination with the concomitant substrate failure of the adhesive joint, were observed. From this research, the potential implementation of the formulated PU-urea systems as competitive adhesive alternatives was proven. It was shown that the temporally controlled UV-induced functional group release is essential for achieving optimum adhesion performance.

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优化聚氨酯尿素粘合剂配方的紫外线光响应固化性能

以 4,4′-亚甲基二苯基二异氰酸酯（MDI）、1,5-戊二醇（PD）、1,5-戊二胺（CAD）和丙酮为粘合剂载体配制了紫外光固化聚氨酯脲粘合剂（PU-urea）。这些聚氨酯-尿素配方的紫外线触发固化过程是通过用 6-硝基藜芦酰氧羰基（NVoc）作为光敏保护基团分别阻断 PD 和 CAD 的羟基和胺官能团来控制的。事实证明，这种粘合剂配方可进行双重固化，即紫外线诱导的聚合和挥发性粘合剂载体的释放。这项研究强调了在合成光触发粘合剂以获得最佳性能的过程中，氨基甲酸乙酯与脲的连接比例所起的关键作用。因此，NCO:OH:NH2 摩尔比为 2.6:1.0:0.5、丙酮含量为 96% 的配方在 PETG 粘合剂-PETG 接头中表现出最合适的机械响应。在 60 分钟的光固化过程（180 mW cm-2）中，观察到剪切强度值约为 6.11 MPa，同时粘合剂接头的基底也会失效。这项研究证明，配制的聚氨酯-尿素系统有可能成为具有竞争力的粘合剂替代品。研究表明，时间上可控的紫外线诱导官能团释放对于实现最佳粘合性能至关重要。

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来源期刊

Polymer 化学-高分子科学

CiteScore

7.90

自引率

8.70%

发文量

959

审稿时长

32 days

期刊介绍： Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.