将不同辐照剂量的壳聚糖进行酰化改性,然后分别测定改性前后壳聚糖水溶性和粘度,并通过傅里叶红外光谱仪(FT-IR)、热重-差热综合分析仪(TG/DTA)、粉末X-衍射仪(XRD)和电子扫描电镜仪(SEM)对其结构进行表征。结果表明:辐照剂量越大,壳聚糖酰化改性产物产率越低;与壳聚糖相比,未辐照的酰化改性后壳聚糖水溶性和分子量大大增加,粘度明显下降;而随着辐照剂量的增加,经过辐照的酰化改性后壳聚糖水溶性和分子量没有明显的变化,粘度明显降低。FT-IR和TG/DTA图表明酰化改性后壳聚糖分子中成功引入了亲水基团(羧基),XRD和SEM图分别显示酰化改性后壳聚糖晶体结构被破坏,呈现疏松多孔结构,改性后壳聚糖的结构更有利于水分子的进入。结构决定性质,结构变化必然引起性质的变化。进行壳聚糖酰化改性产物结构和性质的比较,对壳聚糖的进一步应用具有理论参考价值。 The chitosan with different irradiation dose was acylated and then the water solubility and viscosity of the chitosan before and after modification were measured respectively. The water solubility and viscosity of chitosan before and after modification were measured by Fourier transform infrared spectroscopy (FT-IR), TG-DTA TG / DTA), powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the higher the irradiation dose, the lower the yield of the acylated product of chitosan. Compared with the chitosan, the water-solubility and the molecular weight of the un-irradiated acylation-modified chitosan greatly increased and the viscosity decreased significantly ; But with the increase of irradiation dose, the water solubility and molecular weight of irradiated chitosan did not change obviously and viscosity decreased obviously. The results of FT-IR and TG / DTA showed that the hydrophilic group (carboxyl group) was successfully introduced into the acylated chitosan molecule. The XRD and SEM images showed that the crystal structure of the chitosan was damaged after acylation. Loose porous structure, modified chitosan structure is more conducive to the entry of water molecules. Structural determinism, structural change will inevitably lead to changes in nature. Chitosan acylation of the product structure and properties of the comparison, the further application of chitosan has theoretical reference value.