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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Mixtures of numerous different n-alkanes: 1. Structural studies by X-ray diffraction at room temperature—Correlation between the crystallographic long c parameter and the average composition of multi-alkane phases
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Mixtures of numerous different n-alkanes: 1. Structural studies by X-ray diffraction at room temperature—Correlation between the crystallographic long c parameter and the average composition of multi-alkane phases

机译:多种不同正构烷烃的混合物:1.在室温下通过X射线衍射进行结构研究-晶体长c参数与多烷烃相平均组成之间的相关性

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摘要

Two quaternary equimolar alloys (C_(22)/C_(26)/C_(30)/C_(34) and C_(24)/C_(28)/C_(32)/C_(36)) and three commercial products, which respectively consist of 23 and 33 consecutive n-alkanes with chain lengths between 20 and 52 carbon atoms, are studied by X-ray diffraction analyses. A single orthorhombic solid solution, identical to one of the two intermediate phases seen in binary n-alkane systems, is observed in two commercial products and in their 50-50 wt% mixture. The n-alkane molar concentrations and the long crystallographic c parameters have been determined and allow us to demonstrate that the molecule layer stacking periodicity is quasi-equal to the average length of n-alkane chains of these complicated mixtures: this periodicity corresponds to that of a hypothetical orthorhombic pure n-alkane whose equivalent carbon atom number is quasi-equal to the average carbon atom number of commercial multi-n-alkane mixtures. Discontinuous distributions of chain lengths lead to the observation of two or three orthorhombic phases in the quaternary alloys and the presence of an orthorhombic solid solution and of an amorphous solid in the third commercial multi-n-alkane product.
机译:两种四元等摩尔合金(C_(22)/ C_(26)/ C_(30)/ C_(34)和C_(24)/ C_(28)/ C_(32)/ C_(36))和三种商品,通过X射线衍射分析研究了分别由23个和33个连续的正构烷烃(链长在20和52个碳原子之间)组成的正构烷烃。在两种市售产品及其50-50 wt%的混合物中观察到一种单一的正交晶固溶体,与二元正构烷烃系统中的两个中间相之一相同。已经确定了正构烷烃的摩尔浓度和长晶学参数,这使我们能够证明分子层堆积的周期与这些复杂混合物的正构烷烃链的平均长度近似相等:假设的正交各向异性纯正烷烃,其等效碳原子数近似等于商用多正构烷烃混合物的平均碳原子数。链长的不连续分布导致在四元合金中观察到两个或三个正交相,在第三种商用多正构烷烃产品中存在正交晶固溶体和无定形固体。

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