光聚合壳聚糖基絮凝剂的光谱表征研究

发布时间：2018-03-13 13:20

本文选题：光聚合　切入点：壳聚糖　出处：《光谱学与光谱分析》2017年08期 　论文类型：期刊论文

【摘要】：由于壳聚糖的大分子键上分布着大量的氨基、羟基和N-乙酰基等活性功能基团,将其改性作为天然绿色絮凝剂越来越受到关注,但对其的接枝共聚产物的光谱学表征研究鲜有报道。因此,对壳聚糖基絮凝剂进行光谱学表征与分析研究具有重要意义。论文以壳聚糖(CS)、丙烯酰胺(AM)、二甲基二烯丙基氯化铵(DMDAAC)为接枝共聚单体,采用光聚合技术制备壳聚糖基絮凝剂CS-P(AM-DMDAAC)。采用X射线衍射(XRD)、紫外光谱(UV)、红外光谱(IR)研究其结构特征;分析了壳聚糖、丙烯酰胺、二甲基二烯丙基氯化铵及三者接枝共聚产物的X射线衍射(XRD)、紫外光谱(UV)、红外光谱(IR)的图谱特征和振动吸收峰归属。研究了壳聚糖脱乙酰度、壳聚糖浓度、阳离子度对接枝共聚产物壳聚糖基絮凝剂CS-P(AM-DMDAAC)的X射线衍射(XRD)、紫外光谱(UV)、红外光谱(IR)的影响。UV光谱和IR光谱研究结果证明CS,AM和DMDMAAC成功发生接枝共聚反应制备出CS-P(AM-DMDAAC),壳聚糖浓度增加导致其光谱对称性减弱。XRD图谱研究表明接枝共聚反应使得壳聚糖的晶型结构趋向不定型结构转变,不定型结构相比于晶型结构更易于水化,故接枝共聚产物具有更加优异的溶解性。
[Abstract]:Due to the large number of active functional groups such as amino, hydroxyl and N-acetyl groups distributed on the macromolecular bonds of chitosan, the modification of chitosan as natural green flocculants has attracted more and more attention. However, there are few reports on the spectroscopic characterization of the graft copolymerization products. It is of great significance to study the spectroscopic characterization and analysis of chitosan based flocculants. Chitosan based flocculant CS-PnAM-DMDAAC was prepared by photopolymerization. Its structural characteristics were studied by X-ray diffraction (XRDX), UV spectroscopy (UV) and IR spectroscopy (IR). The spectrum characteristics and vibrational absorption peaks of Dimethyldiallylammonium chloride and its graft copolymerization products were characterized by X-ray diffraction, UV spectra and IR spectra. The degree of deacetylation of chitosan and the concentration of chitosan were studied. Effects of X-Ray diffraction (XRD), Ultraviolet Spectroscopy (UV), IR Spectroscopy (IR) on the CS-PnAM-DMDAAC-based flocculant of Cationic degree Graft copolymerization. The results of UV and IR spectra show that CS-PAM-DMDAAC was successfully prepared by graft copolymerization of CSS-PAM-DMDAAC.The results of UV and IR spectra showed that CS-PMAM-DMDAACwas successfully prepared by the graft copolymerization of CSS-PMAM-DMDAAC. The results of XRD analysis showed that the crystal structure of chitosan tended to be amorphous due to the graft copolymerization. The amorphous structure is easier to hydrate than the crystalline structure, so the graft copolymer has better solubility.
【作者单位】：南京工业大学城市建设学院;南京工业大学环境科学与工程学院江苏省工业节水减排重点实验室;重庆大学重庆市水处理混凝剂工程技术研究中心;
【基金】：国家自然科学基金项目(51508268) 江苏省自然科学基金项目(BK20150951) 中国博士后科学基金项目(2016M591835)资助
【分类号】：O657.3;TQ085.4

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