直线型和H-型刚柔嵌段低聚物的合成及自组装性质的研究

发布时间：2018-04-23 09:11

本文选题：刚棒-线团分子 + 自组装　；参考：《延边大学》2017年硕士论文

【摘要】：两亲性三嵌段分子在超分子化学领域被广泛的研究,所以由嵌段分子聚集形成的超分子体系备受关注。本文设计合成了四个扭动的H-型目标分子,通过二溴对二甲苯将刚棒中心连有羟基的刚棒线团分子相连。柔性链部分为直线型和树枝状的聚环氧乙烷链,通过界面甲基的对比来考察柔性链的横截面积和刚棒的形状对分子自组装所产生的影响。以及刚棒中心连有侧基的刚柔嵌段低聚物,目的是想要研究刚棒侧部连有不同基团对聚集形貌的影响。通过核磁(1H-NMR)、飞行质谱(TOF-MASS)、差式热量扫描仪(DSC)、小角X射线散射(SAXS)、偏光显微镜(POM)等对这些化合物在本体状态下的聚集能力进行研究,通过紫外-可见光谱、荧光光谱,以及原子力显微镜(AFM)等仪器对目标分子在水溶液中的聚集体形貌进行了分析,主要讨论了刚棒的形状、柔性链长度、柔性链横截面积等因素对目标分子在本体中自组装行为和水溶液中聚集体形貌的影响。结果表明,刚棒中心侧部引入轻基和甲氧基,通过调节刚棒嵌段间的非共价相互作用直接影响其在本体和水溶液中的自组装行为。对于H-型分子,虽然四个目标分子具有相同的H-型刚棒嵌段骨架,但是柔性链的不同影响着其在本体和水溶液中的聚集行为。在这里影响分子在水溶液中聚集行为的主要驱动力是空间的位阻效应和π-π堆积作用。
[Abstract]:Amphiphilic triblock molecules have been widely studied in the field of supramolecular chemistry. In this paper, we have designed and synthesized four torsional H-type target molecules, which are connected by dibromo-p-xylene with hydroxyl groups in the center of the rod. The flexible chain is a linear and dendritic poly (ethylene oxide) chain. The effects of cross section area and rigid rod shape of the flexible chain on the molecular self-assembly are investigated by the comparison of interfacial methyl. The purpose of this study is to study the effect of different groups on the morphology of the rigid rod. The aggregation ability of these compounds in bulk state was studied by NMR 1H-NMRT, TOF-MASS, differential heat scanner, small angle X-ray scattering (SAXS), polarizing microscope (POM) and so on. UV-Vis spectra, fluorescence spectra, fluorescence spectra, and so on were used to study the aggregation of these compounds. Atomic force microscope (AFM) and other instruments were used to analyze the aggregation morphology of the target molecule in aqueous solution. The shape of the rod and the length of the flexible chain were discussed. The influence of the cross sectional area of the flexible chain on the self-assembly behavior of the target molecule in the bulk and the morphology of the aggregates in aqueous solution. The results show that the introduction of light and methoxy groups to the central side of the rod directly affects the self-assembly behavior in the bulk and aqueous solution by regulating the noncovalent interaction between the rigid rod blocks. For H- type molecules, although the four target molecules have the same H-type rigid bar block skeleton, the different flexible chains affect their aggregation behavior in bulk and aqueous solution. The main driving forces affecting molecular aggregation in aqueous solution are steric resistance and 蟺-蟺 accumulation.
【学位授予单位】：延边大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O631

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