Enhancing the Weather Resistance and Helium Gas Barrier Properties of Polyurethane Nanocomposites through the Synergism of Organic UV Additives with Organoclay, Graphene, and UV-Shielding Nanopowders

IF 4.7 2区化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Polymer Materials Pub Date : 2025-07-24 DOI:10.1021/acsapm.5c01729

Bapan Adak, Mangala Joshi* and B.S. Butola*,

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引用次数: 0

Abstract

This paper reports a comparative study of the synergistic effects between organic UV additives and nanomaterials of different morphologies─nanoclay, functionalized graphene, and nanoparticles (calcined TiO₂/ZnO-based UV shielding nanopowders (USN))─on the weather resistance and helium gas barrier properties of polyurethane (TPU) nanocomposite films. Improvement in nanomaterial dispersion was observed in the presence of organic UV additives. The morphological analysis showed exfoliated structures for TPU/clay and mixed intercalated/exfoliated structures for TPU/graphene nanocomposites. Nanocomposites without organic UV additives exhibited increased storage modulus and glass transition temperature, while organic UV stabilizers induced slight plasticization. Prior to weathering, clay-based polyurethane nanocomposites demonstrated superior helium barrier properties, followed by graphene- and then USN-based systems. After accelerated weathering, only clay-based nanocomposites showed significant deterioration in barrier and tensile properties, whereas graphene and USN-based nanocomposites retained their properties better. The inclusion of organic UV additives provided synergistic enhancement, resulting in superior retention of tensile and barrier properties after UV exposure compared with only nanomaterial-incorporated nanocomposite systems. These findings highlight the promise of such multifunctional nanocomposite films for applications requiring both weather resistance and gas barrier performance, such as lighter-than-air structures.

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有机UV添加剂与有机粘土、石墨烯和防紫外线纳米粉的协同作用增强聚氨酯纳米复合材料的耐候性和氦气阻隔性

本文比较研究了有机UV添加剂与不同形态的纳米材料──纳米粘土、功能化石墨烯和纳米颗粒（煅烧的TiO2/ zno基UV屏蔽纳米粉（USN））──对聚氨酯（TPU）纳米复合膜耐温性能和氦气阻隔性能的协同效应。在有机UV添加剂的存在下，纳米材料的分散性得到了改善。形貌分析表明，TPU/粘土为剥离结构，TPU/石墨烯纳米复合材料为混合插层/剥离结构。不添加有机UV添加剂的纳米复合材料的存储模量和玻璃化转变温度增加，而有机UV稳定剂则引起轻微的塑化。在风化之前，粘土基聚氨酯纳米复合材料表现出优越的氦屏障性能，其次是石墨烯，然后是usn基系统。加速风化后，只有粘土基纳米复合材料的阻隔性能和拉伸性能明显下降，而石墨烯和usn基纳米复合材料的阻隔性能和拉伸性能保持较好。有机UV添加剂的加入提供了协同增强作用，与仅加入纳米材料的纳米复合材料系统相比，在紫外线照射后，其拉伸和阻隔性能保持得更好。这些发现突出了这种多功能纳米复合薄膜的应用前景，它既需要耐候性，又需要气体阻隔性能，比如轻于空气的结构。

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来源期刊

ACS Applied Polymer Materials Multiple-

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.