热致塑性形状记忆水凝胶的制备与表征

发布时间：2018-06-20 16:54

  本文选题：形状记忆 + 凝胶　； 参考：《中国科学技术大学》2016年硕士论文

【摘要】：形状记忆高分子材料能够在环境刺激(如温度、光、电、磁、化学物质、pH等)和应力作用下定形为一个临时形状,当再一次受到相同刺激时,材料会从临时形状回复到初始形状。在凝胶中设计形状记忆效应,能够同时结合凝胶的固体-液体特性,在传感与运动器件、生物医疗、仿生材料、结构发光、药物释放等方面有光明的应用前景。在本文中,我们尝试通过简单便捷的方法来制备凝胶,借助红外谱图、核磁氢谱、X射线衍射、流变测试、差示扫描量热等手段对凝胶体系进行表征和研究,进一步在凝胶体系中设计形状记忆效应。主要内容包括：基于胶束聚合方法的基本原理,直接在水溶液热引发聚合丙烯酰胺、阳离子表面活性单体、丙烯酸来制备疏水改性两性聚电解质水凝胶。研究了三氯化铁溶液和氯化钠溶液对体系的影响。以此出发,设计出两种不同的形状记忆效应。进一步研究温度对体系的影响,发现可以通过在弹性网络中产生塑性变形,从而使体系的形状记忆效应变得与众不同,针对这种热致塑性的潜在机理进行了分析与探讨。基于琼脂糖在水溶液中的结构-性能关系,直接在水相中采用一锅法合成化学-物理混合交联的水凝胶。研究了琼脂糖含量、Fe(Ⅲ)-柠檬酸溶液对体系的影响,以及温度对体系的影响。基于琼脂糖的螺旋-无规线团温控可逆转变和Fe(Ⅲ)-柠檬酸对光照的响应性,分别设计出温度、光照控制的形状记忆效应,针对潜在的机理进行分析和探讨。本方法能够克服己报到的热致形状记忆凝胶的方法存在的一些问题,同时也为凝胶中光控形状记忆的设计提供了新思路。
[Abstract]:Shape memory polymer materials can be shaped into a temporary shape under environmental stimuli (such as temperature, light, electricity, magnetism, chemicals, pH, etc.) and stress, when again stimulated by the same stimulus, The material reverts from the temporary shape to the initial shape. The design of shape memory effect in gel can combine the solid-liquid properties of gel at the same time. It has a bright future in sensing and moving devices biomedical biomimetic materials structure luminescence drug release and so on. In this paper, we try to prepare gel by simple and convenient method, and characterize and study the gel system by means of infrared spectroscopy, nuclear magnetic hydrogen spectrum X-ray diffraction, rheological test, differential scanning calorimetry, etc. The shape memory effect was further designed in the gel system. The main contents are as follows: hydrophobic modified amphoteric polyelectrolyte hydrogels are prepared by direct thermal initiation of acrylamide, cationic surfactant and acrylic acid in aqueous solution based on the basic principle of micellar polymerization. The effects of ferric chloride solution and sodium chloride solution on the system were studied. Based on this, two different shape memory effects are designed. The influence of temperature on the system is further studied. It is found that the shape memory effect of the system can be distinguished by forming plastic deformation in the elastic network. The potential mechanism of the thermoplastic effect is analyzed and discussed. Based on the structure-performance relationship of agarose in aqueous solution, the chemical-physical crosslinked hydrogels were synthesized by one-pot method in water phase directly. The effect of agarose content of Fe (鈪，

本文编号：2044969