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天然胶原纤维被成功地溶解于1-丁基-3-甲基咪唑氯化物([BMIM]Cl)离子液体中,并且在不同的沉淀剂中再生。在偏光显微镜中观察,发现胶原纤维的晶体结构在加热过程中已经被[BMIM]Cl破坏了。利用变温红外光谱法检测溶解过程中胶原/[BMIM]Cl的结构变化。利用FTIR和XRD表征再生胶原的结构。结果表明,胶原蛋白的三螺旋结构在溶解与再生过程中一定程度上被破坏了。沉淀的处理很大程度上决定了再生胶原的成膜能力和热稳定性,提出了胶原在[BMIM]Cl中溶解以及在沉淀剂中再生的可能机制。利用[BMIM]Cl作为介质可以成功制备不同形态(薄膜,纤维,凝胶)的胶原蛋白/纤维素复合材料。
Native collagen fibers were successfully dissolved in 1-butyl-3-methylimidazolium chloride ([BMIM] Cl) ionic liquids and regenerated in different precipitants. Observation in a polarizing microscope revealed that the crystal structure of collagen fibers was destroyed by [BMIM] Cl during heating. The structure change of collagen / [BMIM] Cl during dissolution was examined by the method of infrared spectroscopy. The structure of regenerated collagen was characterized by FTIR and XRD. The results showed that the triple helix structure of collagen was destroyed to a certain degree during dissolution and regeneration. Precipitation treatment largely determines the membrane-forming ability and thermal stability of regenerated collagen. Proposed mechanisms for the collagen to dissolve in [BMIM] Cl and regenerate in the precipitant are proposed. With [BMIM] Cl as a medium, collagen / cellulose composites with different morphology (film, fiber and gel) can be successfully prepared.