Al Lafi Abdul G, Alzier Ali, Allaf Abdul W
Department of Chemistry, Atomic Energy Commission, P.O. Box: 6091, Damascus, Syrian Arab Republic.
Heliyon. 2021 Jun 11;7(6):e07306. doi: 10.1016/j.heliyon.2021.e07306. eCollection 2021 Jun.
Proton irradiated poly (ether ether ketone) (PEEK) films were crystallized to different extents, and subsequently characterized by wide angle X-ray diffraction technique. The data were analyzed by two-dimensional correlation mapping (2D-CM), in particular: Generalized, hybrid and multiple perturbations correlation approaches. Two asynchronous correlation peaks at (19.1, 18.7) and at (22.5, 19.1) were utilized as a measure the crystal perfection and the preferred process; orientation/crystal growth respectively. Proton irradiation not only favored the formation of crystal form II, but also changed the type of orientation within the irradiated films. Differential scanning calorimetry and Raman spectroscopic analysis confirmed the contribution of the previous two factors. Raman spectra indicated that the intensity of both bands at 1595 and 1608 cm decreased on samples crystallized from the melt, but increased on cold crystallized samples. 2D-CM combined with other suitable techniques is a promising in evaluating the structure of polymers and revealing the effect of proton irradiation.
对质子辐照的聚醚醚酮（PEEK）薄膜进行不同程度的结晶处理，随后采用广角X射线衍射技术对其进行表征。通过二维相关映射（2D-CM）对数据进行分析，具体包括：广义、混合和多重扰动相关方法。位于（19.1, 18.7）和（22.5, 19.1）处的两个异步相关峰分别用于衡量晶体完善程度和择优过程；取向/晶体生长情况。质子辐照不仅有利于II型晶体的形成，还改变了辐照薄膜内部的取向类型。差示扫描量热法和拉曼光谱分析证实了前两个因素的作用。拉曼光谱表明，对于从熔体结晶的样品，1595和1608 cm处两条谱带的强度均降低，但对于冷结晶样品则增加。二维相关映射与其他合适的技术相结合，在评估聚合物结构和揭示质子辐照的影响方面具有广阔前景。
