静电排斥作用对海洋生物质多糖液晶行为的影响

发布时间：2018-06-11 19:06

本文选题：海藻酸钠 + 静电排斥　；参考：《青岛大学》2016年硕士论文

【摘要】：液晶是介于固体、气体以及液体三态之外的第四态,具有连续性以及有序性等特点。因具有高度有序的特点,可以用于制备高强高模的纤维及多功能复合膜。液晶态形成的影响因素主要包含三点:1)分子链长宽比远大于1;2)分子链具有一定的刚性;3)液晶溶液中含有一定的电荷强度。本论文主要从电荷强度的角度研究静电排斥对生物大分子海藻酸钠与壳聚糖以及二维氧化石墨烯的液晶性的影响,进而分析静电排斥对液晶性形成的促进的生物普适性。1.通过制备不同溶液组成的海藻酸钠与壳聚糖等溶液,研究了静电排斥对不同分子结构参数以及溶液组成的海洋生物质多糖液晶行为的影响。采用偏光显微镜表征,发现了低分子量海藻酸钠以及壳寡糖的加入将诱导难以形成液晶态的多糖溶液产生液晶相,而且在某一比例,液晶形态达到最大化。采用旋转流变仪表征,发现了相似的结果,进而得出了静电排斥将促进生物多糖液晶态形成乃至增强的结果。同时研究了不同结构的同种电荷对液晶性能的影响,研究发现,阿拉伯树胶的加入也对海藻酸钠溶液的液晶态形成有良好的效果。2.研究了二维材料氧化石墨烯对海藻酸钠液晶性的影响。通过Hummers法制备得到不同尺寸的GO溶液,并对GO进行POM、IR、SEM以及TGA等对GO的性能进行分析。通过配制不同溶液组成的氧化石墨烯/海藻酸钠复合溶液,研究了不同分子结构参数与溶液组成对溶液液晶性的影响。采用旋转流变仪与偏光显微镜的表征得出氧化石墨烯的加入将对生物大分子海藻酸钠的液晶性有促进作用。综上所述,静电排斥作用对于液晶的形成有一定的促进作用,这对于液晶理论的进一步完善有着很好的补充。
[Abstract]:Liquid crystal is the fourth state between solid, gas and liquid, which has the characteristics of continuity and order. Because of its highly ordered characteristics, it can be used to prepare high strength and high modulus fiber and multifunctional composite membrane. The main factors affecting the formation of liquid crystal state include three points: 1) the aspect ratio of molecular chain is far greater than 1 / 2) the chain has a certain rigidity and a certain charge intensity in liquid crystal solution. In this paper, the effect of electrostatic exclusion on the liquid crystalline properties of biological macromolecules such as sodium alginate, chitosan and two-dimensional graphene oxide was studied from the point of view of charge intensity, and the biological universality of electrostatic exclusion on the formation of liquid crystal was analyzed. The effects of electrostatic exclusion on the liquid crystal behavior of marine biomass polysaccharides with different molecular structure parameters and solution composition were studied by preparing different solutions of sodium alginate and chitosan. It was found that the addition of low molecular weight sodium alginate and chitosan oligosaccharide could induce liquid crystalline phase in polysaccharide solution which was difficult to form liquid crystal state, and the liquid crystal morphology was maximized in a certain proportion. By using the rotating rheometer, the similar results were found, and it was concluded that electrostatic exclusion would promote the formation and even enhancement of liquid crystal state of biopolysaccharide. At the same time, the effect of the same charge of different structure on the liquid crystal properties was studied. It was found that the addition of Arabic gum also had a good effect on the liquid crystal formation of sodium alginate solution. The effect of graphene oxide on the liquid crystal properties of sodium alginate was studied. Go solutions of different sizes were prepared by Hummers method, and the properties of go were analyzed by POM IR SEM and TGA. The effects of different molecular structure parameters and solution composition on liquid crystal properties of graphene oxide / sodium alginate composite solution were studied. The results of rotating rheometer and polarizing microscope show that the addition of graphene oxide will promote the liquid crystal properties of the biological macromolecule sodium alginate. To sum up, electrostatic repulsion can promote the formation of liquid crystal, which is a good supplement to the further improvement of liquid crystal theory.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：O753.2

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