Design and development of a novel polymer coating system with exceptional creep resistance.

Npj materials sustainability Pub Date : 2025-01-01 Epub Date: 2025-06-30 DOI:10.1038/s44296-025-00063-x

Nader Ameli, Jaya Verma, Beth Muthoni Irungu, Sepideh Aliasghari, Andrei Shishkin, Allan Matthews, Saurav Goel

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Abstract

Polymer coatings often suffer from poor mechanical properties, including low strength and modulus, making them prone to creep failure under minimal loads. To address these challenges, this study introduces a novel polyurethane (PU) coating reinforced with 4 wt% hollow ceramic microspheres (HCM) coated with a TiO₂ shell (HCM@TiO₂). The modified coating exhibited a 111% increase in nanoindentation hardness, along with significant reductions in creep displacement (31%), indentation creep rate (19%), and creep strain rate sensitivity (28%) compared to the base PU. In contrast, a second additive, solid silica nanospheres with TiO₂ shells (SSN@TiO₂), did not improve mechanical performance and even increased creep displacement by 31%, likely due to polymer chain sliding. Notably, the HCM@TiO₂ coating maintained and even improved its creep resistance under higher loads. These findings suggest that HCM@TiO₂-enhanced coatings could be highly beneficial for applications requiring resistance to high-cycle creep-fatigue failure.

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具有优异抗蠕变性能的新型聚合物涂层体系的设计与开发。

聚合物涂层通常具有较差的机械性能，包括低强度和模量，使其在最小载荷下容易发生蠕变破坏。为了解决这些挑战，本研究引入了一种新型聚氨酯（PU）涂层，该涂层由4wt %的空心陶瓷微球（HCM）增强，并涂有TiO₂外壳（HCM@TiO₂）。与基础PU相比，改性涂层的纳米压痕硬度提高了111%，同时蠕变位移（31%）、压痕蠕变率（19%）和蠕变应变率敏感性（28%）显著降低。相比之下，第二种添加剂，具有TiO₂壳的固体二氧化硅纳米球（SSN@TiO₂），没有提高机械性能，甚至增加了31%的蠕变位移，可能是由于聚合物链滑动。值得注意的是，HCM@TiO₂涂层在更高的载荷下保持甚至提高了其抗蠕变性能。这些发现表明，HCM@TiO₂增强涂层对于需要抗高周蠕变疲劳失效的应用非常有益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Npj materials sustainability

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