广角x射线散射分析聚酰胺5.10晶体结构、含水量、织构与老化降解的相关性

IF 7.4 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability Pub Date : 2025-08-22 DOI:10.1016/j.polymdegradstab.2025.111620

Celia Katharina Falkenreck , Alexander Liehr , Jan-Christoph Zarges , Hans-Peter Heim , Thomas Niendorf

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引用次数: 0

摘要

本研究详细分析了聚酰胺5.10 （PA5.10）的结晶结构，确定了水热老化对其含水率、结晶度和织构的影响。利用广角x射线散射（WAXS），这项工作展示了对非晶边界层和半晶核心的见解。基于布拉格定律的Python脚本可以精确识别晶体细节。结晶峰的高斯拟合进一步加深了对结构的理解。考察了实验参数对WAXS测量的影响，以确定影响PA5.10的其他因素。水热老化导致了显著的变化，包括吸湿性增加、体积膨胀、结晶度增强以及分子结构和晶体形态的变化。WAXS显示水分引起的散射降低了强度，这在重新干燥后是可逆的。尽管差示扫描量热法（DSC）观察到结晶度增加，但WAXS没有捕捉到相应的位移，可能是由于残余水分和退火过程的综合影响。综上所述，本研究增强了对PA5.10在热液作用下结晶行为的认识，为进一步研究PA5.10的老化过程和结构演化奠定了基础。这些发现有助于更广泛地了解生物基聚酰胺在水热和潮湿条件下的长期降解机制和稳定性。此外，所获得的见解与预测湿敏感应用中的材料性能有关，并可以为吸湿性聚合物的稳定策略的发展提供信息。

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Correlation of the crystalline structure, moisture content, texture and aging-induced degradation of polyamide 5.10 using wide-angle x-ray scattering analysis

The present study provides a detailed analysis of the crystalline structure of polyamide 5.10 (PA5.10) and determines the effects of hydrothermal aging on its moisture content, crystallinity, and texture. Using wide-angle X-ray scattering (WAXS), thework presents insights into both the amorphous boundary layer and the semi-crystalline core. A Python script based on Bragg’s law enables precise identification of crystalline details. Gaussian fitting of crystalline peaks further deepened the structural understanding. The effects of experimental parameters on WAXS measurements were examined to identify additional factors influencing PA5.10. Hydrothermal aging led to notable changes, including increased moisture absorption, volume expansion, enhanced crystallinity, and shifts in molecular structure and crystalline morphology. WAXS revealed that moisture-induced scattering reduced intensity, which was reversible upon re-drying. Despite an increase in crystallinity observed by differential scanning calorimetry (DSC), WAXS did not capture a corresponding shift, likely due to the combined effects of residual moisture and annealing processes. Overall, the present study enhances the understanding of crystalline behavior of PA5.10 under hydrothermal exposure and provides a basis for future investigations into its aging processes and structural evolution. These findings contribute to a broader understanding of the long-term degradation mechanisms and stability of bio-based polyamides under hydrothermal and humid conditions. Moreover, the insights gained are relevant for predicting material performance in moisture-sensitive applications and can inform the development of stabilization strategies for hygroscopic polymers.

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来源期刊

Polymer Degradation and Stability 化学-高分子科学

CiteScore

10.10

自引率

10.20%

发文量

325

审稿时长

23 days

期刊介绍： Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.