Consequences of repeated hyperbaric hydrogen exposures on mechanical properties and microstructure of polyamide 11

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing Pub Date : 2024-09-18 DOI:10.1016/j.polymertesting.2024.108581

C. Le Talludec , H. Ono , K. Ohyama , S. Nishimura , A. Nait-Ali , H.A. Cayzac , S. Tencé-Girault , S. Castagnet

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Abstract

The objective was to evaluate the impact of repeated exposure to hyperbaric hydrogen (90 MPa; 30 °C) and pressure release on the microstructure and mechanical behavior of PA11. Samples were analyzed after 1, 2, 5 and 10 cycles, by SAXS, WAXS, DMA, DSC, and a series of mechanical tests with variable triaxiality ratio. The most visible change in the residual state after desorption was a stiffening of the amorphous phase. It mainly originated from the first cycle, especially the first pressurization. The crystalline phase was slightly affected and no evidence of nano-voiding was brought in the residual state up to 10 cycles. Similar analyses were conducted during the first cycle's desorption transient. They showed a reversible plasticizing effect and a trend of nano-voiding vanishing after desorption but might promote damage upon further triaxial loading.

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反复高压氢暴露对聚酰胺 11 机械性能和微观结构的影响

目的是评估反复暴露于高压氢气（90 兆帕；30 °C）和压力释放对 PA11 的微观结构和机械行为的影响。通过 SAXS、WAXS、DMA、DSC 和一系列三轴比可变的机械测试，对 1、2、5 和 10 个循环后的样品进行了分析。解吸后残余状态最明显的变化是无定形相变硬。这主要源于第一个循环，尤其是第一次加压。结晶相受到的影响较小，在 10 个循环之前的残余状态中没有出现纳米空泡的迹象。在第一个循环的解吸瞬态期间也进行了类似的分析。结果表明，在解吸后，纳米空泡呈可逆塑化效应和消失趋势，但在进一步三轴加载时可能会造成损坏。

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来源期刊

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.