X-RAY STRUCTURE OF POLYANILINE
X-RAY STRUCTURE OF POLYANILINE
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DOI：
10.1021/ma00003a022
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发表时间：
1991-02-04
期刊：
影响因子：
5.5
通讯作者：
MACDIARMID, AG
中科院分区：
文献类型：
--
作者：
POUGET, JP;JOZEFOWICZ, ME;MACDIARMID, AG
我们区分了两类祖母绿形式的聚苯胺。I类祖母绿是指导电盐类呈现Es-I晶体结构，绝缘基形式基本上为无定形EB-I的祖母绿。通常，当聚合物以质子化形式从溶液中获得时，形成I类材料。属于II类的聚苯胺样品具有导电盐型的ES-II结构和绝缘碱形式的EB-II结构。属于II类的祖母绿样品最初以非质子化形式制备。分析了Es-I、Eb-II和Es-II的晶体组成，并通过比较衍射图和强度计算得出了它们的基本结构参数。EB-II的结构类似于聚苯硫醚和聚苯醚等化学相似的聚合物。ES-I和ES-II结构在紧凑性上有很大不同。在I类中，随着质子化程度的增加，微晶尺寸的增大和链间分离的减少与电荷的三维离域程度增加有关。相反，在部分结晶的EB-II中，质子化最初发生在非晶区，随后只掺杂到晶区。
We distinguish between two classes of the emeraldine form of polyaniline. Class I emeraldine is that for which the conducting HCl salt exhibits ES-I crystal structure and the insulating base form is essentially amorphous EB-I. In general, class I materials are formed when the polymer is obtained from solution in the protonated form. Samples of polyaniline belonging to class II possess ES-II structure in the conducting HCl salt form and EB-II structure in the insulating base form. Emeraldine samples belonging to class II were prepared originally in the nonprotonated form. The crystalline components of ES-I, EB-II, and ES-II have been analyzed, and basic parameters of the structures have been derived from comparison between diffraction patterns and intensity calculations. EB-II has a structure similar to that of chemically analogous polymers such as poly(phenylene sulfide) and poly(phenylene oxide). ES-I and ES-II structures differ substantially in their compactness. In class I the increase of crystallite size and decrease in interchain separation with protonation correlate with increasing three-dimensional delocalization of charge with increasing protonation. In contrast, in partially crystalline EB-II, initially protonation occurs in amorphous regions with only subsequent doping into the crystalline areas.