Engineered Self-Blown Nonisocyanate Polyurethanes with Synchronously Enhanced Electromagnetic Interference Shielding and Dimensional Stability

IF 4.7 2区 化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Changtao Pu, Jiaxin Yang, Shuang Jin, Yuhui Zhou* and Wei Gong*, 
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引用次数: 0

Abstract

The growing demand for environmentally friendly materials has driven significant interest in nonisocyanate polyurethane (NIPU) foams. This study presents a facile synthesis of self-blown NIPU foams through a conventional foaming process using binary and ternary cyclic carbonates, enabling the rapid formation of an enhanced polyurethane network within minutes without external nucleating agents. Through strategic incorporation of conductive and magnetic fillers, the modified NIPU foams exhibited exceptional electromagnetic interference (EMI) shielding performance, achieving a shielding effectiveness of 71 dB in the frequency range of 8.2–12.4 GHz. The porous architecture combined with the synergistic effect of functional fillers predominantly facilitated electromagnetic wave absorption, effectively mitigating secondary pollution. Notably, the modified foams demonstrated remarkable improvement in dimensional stability, reducing equilibrium water absorption from 397.5% to 276.7%, and a transition from hydrophilic (58°) to hydrophobic (110°) surface properties, addressing the inherent structural instability caused by hydroxyl groups under ambient conditions. The compressive strength of the foam enhanced from 0.019 to 0.26 MPa at 80% strain. This work not only provides a greener, simpler, and more efficient approach for NIPU production but also establishes a paradigm for designing functional polymeric foams for advanced applications.

Abstract Image

工程自吹非异氰酸酯聚氨酯同步增强电磁干扰屏蔽和尺寸稳定性
对环保材料日益增长的需求推动了对非异氰酸酯聚氨酯(NIPU)泡沫的极大兴趣。本研究提出了一种简单的自吹NIPU泡沫合成方法,采用传统的发泡工艺,使用二元和三元环状碳酸盐,无需外部成核剂,即可在几分钟内快速形成增强型聚氨酯网络。通过战略性地加入导电和磁性填料,改性NIPU泡沫具有优异的电磁干扰(EMI)屏蔽性能,在8.2-12.4 GHz频率范围内实现了71 dB的屏蔽效果。多孔结构结合功能填料的协同作用,主要促进电磁波吸收,有效减轻二次污染。值得注意的是,改性泡沫的尺寸稳定性得到了显著改善,平衡吸水率从397.5%降至276.7%,表面性能从亲水性(58°)转变为疏水性(110°),解决了环境条件下羟基引起的固有结构不稳定性。在80%应变下,泡沫的抗压强度由0.019 MPa提高到0.26 MPa。这项工作不仅为NIPU的生产提供了一种更环保、更简单、更高效的方法,而且为设计先进应用的功能性聚合物泡沫建立了一个范例。
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来源期刊
CiteScore
7.20
自引率
6.00%
发文量
810
期刊介绍: ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.
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