P(VDF-TrFE) copolymers are materials with high relevance in printed organic electronics. These copolymers easily crystallize into the ferroelectric phase without resorting to post-deposition treatments (thermal annealing, poling, or mechanical stretching). The detection of a morphotropic phase boundary further increased the interest in this copolymer system by demonstrating relaxor behavior for higher TrFE content. This prompted an in-depth analysis of the P(VDF-TrFE) chiral chain structure responsible for the relaxor properties. Nevertheless, the efficient application of these materials also depends heavily on the quality and morphology of the crystalline domains. In this work, we combine SAXS and AFM imaging to analyze the structure of the crystalline domains as a function of the TrFE content. The detection of different structural distributions revealed the presence of hierarchical arrangements within the crystalline domains. Furthermore, these hierarchical arrangements were observed to change with the TrFE monomer content, presenting distinct morphologies for low and high TrFE contents, in line with previous works on the morphotropic phase boundary in these systems.

中文翻译：

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P（VDF-TrFE） 共聚物晶体的分层排列：SAXS 和 AFM 研究


P（VDF-TrFE） 共聚物是印刷有机电子学中高度相关的材料。这些共聚物很容易结晶成铁电相，无需进行沉积后处理（热退火、极化或机械拉伸）。形态相边界的检测通过证明较高 TrFE 含量的弛豫行为，进一步增加了人们对这种共聚物系统的兴趣。这促使对负责弛豫特性的 P（VDF-TrFE） 手性链结构进行了深入分析。然而，这些材料的有效应用在很大程度上也取决于晶域的质量和形态。在这项工作中，我们结合了 SAXS 和 AFM 成像来分析晶体畴的结构与 TrFE 含量的关系。对不同结构分布的检测揭示了晶域内存在分层排列。此外，观察到这些分层排列随 TrFE 单体含量的变化而变化，在低和高 TrFE 含量下呈现不同的形态，这与以前在这些系统中形态相边界上的工作一致。