Abstract Polyurethane (PU) and its nanocomposites based gas barrier films and coatings have established a distinctive position among various technologically important materials due to their large-scale potential applications. This review aims at highlighting the gas barrier property of polyurethane nanocomposite (PUNC) based films, membranes and coatings containing platelet-shaped fillers such as clays and graphene in PU matrix. The other fillers such as CNT, POSS, metal nanoparticles and nanocellulose have also been reviewed for their contribution in improving gas barrier property of polymers. The probable transport-mechanism of small gas molecules through PU and PUNCs have been discussed. There is also a discussion on basic PU-chemistry and effect of structure and morphology of PU on its gas barrier property. Various factors which influence the gas permeability through PU and PUNC films and coatings have been scrutinized. Some aspects of improving the gas barrier property of PUNCs have also been discussed. An emphasis is given on various proposed models for prediction of gas permeability through polymer nanocomposites. It also reviews the existing literature related to modeling and prediction of gas permeability of different PUNC membranes, films and coatings. Finally, special attention has been paid to the potential industrial applications of PUNC based films and coatings.

中文翻译：

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基于聚氨酯纳米复合材料的阻气膜、膜和涂层：合成、表征和潜在应用综述

摘要 聚氨酯 (PU) 及其基于纳米复合材料的阻气膜和涂层由于其大规模的潜在应用而在各种具有重要技术意义的材料中确立了独特的地位。本综述旨在强调聚氨酯纳米复合材料 (PUNC) 基薄膜、膜和涂层的气体阻隔性能，这些薄膜、膜和涂层在 PU 基质中含有片状填料，如粘土和石墨烯。其他填料如 CNT、POSS、金属纳米颗粒和纳米纤维素也因其在提高聚合物阻气性方面的贡献而受到审查。已经讨论了小气体分子通过 PU 和 PUNC 的可能传输机制。还讨论了基本 PU 化学以及 PU 的结构和形态对其阻气性的影响。影响通过 PU 和 PUNC 薄膜和涂层的气体渗透性的各种因素已被仔细研究。还讨论了改善 PUNC 阻气性的一些方面。重点介绍了通过聚合物纳米复合材料预测气体渗透性的各种建议模型。它还回顾了与不同 PUNC 膜、薄膜和涂层的气体渗透率建模和预测相关的现有文献。最后，特别关注基于 PUNC 的薄膜和涂料的潜在工业应用。它还回顾了与不同 PUNC 膜、薄膜和涂层的气体渗透率建模和预测相关的现有文献。最后，特别关注基于 PUNC 的薄膜和涂料的潜在工业应用。它还回顾了与不同 PUNC 膜、薄膜和涂层的气体渗透率建模和预测相关的现有文献。最后，特别关注基于 PUNC 的薄膜和涂料的潜在工业应用。