Macromolecular structural evolution of polyimide chains …
2020年10月1日 · Pyromellitic dianhydride (PMDA)/4,4′-oxidianiline (ODA) polyimide (PI) orientation models with different draft ratios were established to reveal the macromolecular …
Electrospun polyimide nanofibers and their applications
2016年10月1日 · The PI (PMDA-ODA) nanofibers were first prepared by electrospinning PAA solution followed by thermal imidization; the PI nanofibers were then treated with typical …
Hierarchical multiscale analysis of polyimide films by molecular ...
2019年9月28日 · At a larger length scale, the X-ray diffraction (XRD) was used to analyze the aggregation structure. The present work would provide a basic guideline for developing high …
Precise structural analysis of polymer materials using ... - Nature
2020年5月28日 · VT-XRD profiles of PMDA-ODA at each tested temperature (a), thermally induced deformation of the lattice parameters and lattice volume (b), and probable crystalline …
In this study, two blend systems, one compatible and one incompatible, have been investigated. Each system consists of a semi-flexible polyimide and a rigid polyimide. These were obtained …
Quantitative analysis of stereoscopic molecular orientations in ...
2021年2月1日 · This paper combines variable-temperature (VT) pMAIRS, static GI-XRD and spectroscopic ellipsometry and reports general insight into the molecular orientation …
Hierarchical Polyimide‐Covalent Organic Frameworks Carbon Fiber ...
2024年6月19日 · To support successful formation, there are significant changes in the profile of the XRD. For MA-PMDA, there are significant new peaks at 2θ of 8°, 16.8°, and 17.6°, along …
Characterization and Thermal Degradation Study of Carbonization …
2021年3月21日 · The organized polyimide/Fe combined films were characterized using a scanning electron microscope (SEM), and thermogravimetric analysis (TGA), X-ray diffraction …
扩链和共混对再生PET /乙烯醋酸乙烯酯共混物结晶度和形态学行为 …
均苯四甲酸二酐（PMDA）对RPET和聚乙烯乙酸乙烯酯（EVA）共混物的相形态和结晶度的扩链作用得到了验证，或者首次包括了共混样品的结晶，热行为和形态。 首先，在内部混合器中 …
亚胺化工艺对PMDA-ODA型线性聚酰亚胺模塑粉制备的影响_百度 …
摘 要：研究了均苯四甲酸二軒 (PMDA)-二氨基二苯瞇 (ODA)型线性聚酰亚胺模塑粉的制备工艺，通过扫描电子显 微镜 (SEM)分析、红外光谱 (FT-IR)分析以及X射线衍射 (XRD)分析对亚胺 …