硼酸交联海藻酸钠/磷虾蛋白复合纤维的制备与表征

针对海藻酸钠/磷虾蛋白（SA/AKP）复合纤维在盐溶液中溶胀问题，利用硼酸与复合纤维交联反应制备了耐盐性SA/AKP 复合纤维。借助傅里叶红外光谱仪、热重分析仪、差示扫描量热仪和X 射线衍射仪研究了复合纤维的化学结构、热性能和结晶性，考察了交联度和纤维形态的关系，评价了纤维力学性能与交联温度的相关性。结果表明：硼酸与海藻酸钠的羟基反应产生了B-O 键；随着交联时间的延长、交联温度的升高，SA/AKP 复合纤维的溶胀度降低，并在交联时间为30 min、交联温度为80 ℃以后趋于平衡，此时溶胀度由未交联纤维的136.99% 降低到82.30%，纤维的耐盐性明显提升，纤维的断裂强度为2.18cN/dtex；交联纤维的断裂强度随着交联温度的升高呈先降低后升高的趋势；未交联纤维与交联纤维表面存在纵向的沟槽结构，交联纤维经过盐溶液处理，表面仍具有沟槽结构。

Preparation and characterization of boric acid cross-linking sodium alginate / krill protein composite fiber

In order to solve the swelling problem of sodium alginate / krill protein(SA /AKP) composite fiber in salt solution, saltresistant SA/AKP composite fiber was prepared by cross-linking reaction of boric acid with composite fiber. Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimeter and X-ray diffraction were used to studythe chemical structure, thermal properties and crystallinity of composite fiber. The relationshipbetween cross-linking degree andfiber morphology was investigated, and the correlationbetween fiber mechanical properties and cross-linking temperature was evaluated. The results show that the B-O bond is formed by the reaction between boric acid and sodium alginate. The swelling degree of the SA/AKP composite fiber decreases and the equilibrium of the fiber is balanced at 30 min and 80 ℃ after the cross-linking time is prolonged and the cross-linking temperature increases. The swelling degree of the cross-linking fiber can be reduced to 82.30% by 136.99%, and the salt resistance of the fiber is improved obviously. At the point, the breaking strength of the fiber is 2.18 cN/dtex. The breaking strength of the cross-linking fibers with the cross-linking temperature firstly increased and then decreases, anda longitudinal groove structure exists on the surface of the cross-linking fiber and the non-cross-linking fiber. After the cross-linking, thefiber was treated with salt solution, the surface still hasthe groove structure.