在0.05~5 mol/L镁离子浓度范围内制备了一系列具有不同性能的海藻酸镁凝胶，考察了镁离子浓度、镁离子用量、镁盐种类和海藻酸钠M/G比值等因素对海藻酸镁凝胶成胶过程的影响，并测试了不同制备条件下凝胶的力学性能和溶胀性能。结果表明，高离子浓度可将海藻酸镁凝胶的拉伸强度提高到400 kPa以上；采用氯化镁、溴化镁、乙酸镁制备的凝胶力学性能较好。同时海藻酸镁具有成胶慢的特点，不同的制备条件可使凝胶形成时间在1 min~10 h内发生变化，显示了其在可注射水凝胶方面具有良好的应用前景。

A series of magnesium alginate gels with different properties are prepared with magnesium ion concentration in the range of 0.05-5mol·L^-1.The effects of the concentration of magnesium ion,the dosage of magnesium,the type of magnesium salt and M/G ratio of sodium alginate on the gelation process of magnesium alginate gel are studied.The mechanical properties and swelling properties of gels prepared under different conditions are tested.Results show that the tensile strength of magnesium alginate gel can be increased to over 400 kPa by using high ion concentration,and the gel prepared by magnesium chloride,magnesium bromide and magnesium acetate has better mechanical properties.Magnesium alginate has the characteristics of slow gel formation,and the gel formation time can be changed within 1 min-10 h by using different preparation conditions,showing that it has a good application prospect in injectable hydrogel.

郭涛(1997-),男,硕士研究生,研究方向为海洋资源化学,gtt3107@163.com