氢暴露弹性体空穴化后不可见分子损伤的三维荧光成像
3D Fluorescent Mapping of Invisible Molecular Damage after Cavi-tation in Hydrogen Exposed Elastomers
摘要：
在高压下用气体饱和的弹性体在快速或爆炸性减压时遭受空腔成核、膨胀和收缩。虽然这一过程通常导致外观上无法检测到的变化，但它会导致内部损伤，妨碍功能性（例如，渗透性），并缩短寿命。在这里，我们标记了一个模型聚（丙烯酸乙酯）弹性体与π-扩展的蒽-马来酰亚胺加合物，荧光聚合物断链，并在3D地图的内部损伤后，气体饱和和快速减压循环。有趣的是，我们观察到，在减压过程中可观察到的每个空腔都会导致损坏区域，其形状揭示了随机取向的硬币形裂纹的断裂轨迹（即，具有花状形态学），其包含裂纹止裂线。因此，空腔生长可能不连续地进行（即，非稳定地）通过许多2D裂纹平面的稳定和不稳定断裂。这种在聚合物网络中以3D方式可视化分子损伤的非破坏性方法是新颖的，并且用于理解在复杂的3D载荷下断裂是如何发生的，预测原始外观弹性体的机械老化，并且具有优化抗空化材料的潜力。
英文摘要：
Elastomers saturated with gas at high pressure suffer from cavity nucleation, inflation, and deflation upon rapid or explosive de-compression. Although this process often results in undetectable changes in appearance, it causes internal damage, hampers func-tionality (e.g., permeability), and shortens lifetime. Here, we tag a model poly(ethyl acrylate) elastomer with π-extended anthracene-maleimide adducts that fluoresce upon polymer chain scission, and map in 3D the internal damage present after a cycle of gas satu-ration and rapid decompression. Interestingly, we observe that each cavity observable during the decompression results in a dam-aged region, the shape of which reveals a fracture locus of randomly oriented penny-shape cracks (i.e., with a flower-like morpholo-gy) that contain crack arrest lines. Thus, cavity growth likely proceeds discontinuously (i.e., non-steadily) through the stable and unstable fracture of numerous 2D crack planes. This non-destructive methodology to visualize in 3D molecular damage in polymer networks is novel and serves to understand how fracture occurs under complex 3D loads, predict mechanical aging of pristine look-ing elastomers, and holds potential to optimize cavitation-resistant materials.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
