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通过Menshutkin反应合成聚(对亚二甲苯基-4,4’-联吡啶二溴)(PXV)半刚性链聚紫精,采用等量混合法将聚紫精与系列不同碳链长度的阴离子表面活性剂脂肪酸钠Cn-1COONa(n=10,12,14,16,18)组装制备聚电解质-表面活性剂(PXV-Cn)复合物,运用DSC,TGA,XRD,FTIR等表征手段初步考察复合物的超分子结构及相行为.基于FTIR谱学分析特征、小角与广角变温XRD数据以及DSC热分析焓变的定量计算结果,表明半刚性主链聚紫精和脂肪酸盐极性头基组成的极性层与侧链烷烃非极性层交替排列形成层状超分子结构,其中烷烃链靠近极性端约8个亚甲基处于无定型态,其余碳链则形成结晶相.最短的PXV-C10形成少量规整度较低的三斜晶βT,n≥16以上的长碳链复合物则以六方相αH为主,其它中等长度侧链脂肪酸盐复合物则为多种结晶形式共存.随着碳链长度n的增加,侧链结晶熔点Tm升高,n≥16的长碳链复合物表现出随温度变化的可逆结晶相态变化.且这类聚紫精-表面活性剂复合物表现出高于200℃的热稳定性.
Synthesis of poly (p-xylylene-4,4’-bipyridine dibromide) (PXV) semi-rigid chain splenosperitone by Menshutkin reaction, using the same amount of mixing method and the series of different concentration of carbon atoms on the chain length of the anionic surface The active agent fatty acid sodium Cn-1COONa (n = 10, 12, 14, 16, 18) was assembled to prepare the polyelectrolyte-surfactant (PXV-Cn) composite by DSC, TGA, XRD and FTIR Based on the FTIR spectra, XRD data of small-angle and wide-angle, and quantitative calculation of enthalpy change of DSC thermal analysis, it is shown that the composition of polar head group Of the polar layer and the paraffins are arranged alternately to form a layered supramolecular structure in which about 8 methylene groups near the polar end of the alkane chain are in an amorphous state and the remaining carbon chains form a crystalline phase, PXV-C10 formed a small amount of triclinic βT with a low degree of regularity, while the long-carbon chain complex with n≥16 or more exhibited hexagonal phase αH while the other medium-length side chain fatty acid salt complexes coexisted in various crystalline forms As the carbon chain length n increases, the melting point Tm of the side chain increases, and the long carbon chain complex with n ≧ 16 Temperature-dependent reversible crystalline phase change and such polyviologens - surfactant complex exhibits a thermal stability higher than 200 ℃.