硼酸交联海藻酸钠/磷虾蛋白复合纤维的制备与表征

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

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2.18 cN/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。

In order to solve the swelling problem of sodium alginate/krill protein（ SA/AKP） composite fiber in salt solution,salt resistant SA/AKP composite fiber was prepared by cross-linked reaction of boric acid with composite fiber. Fourier transform infrared spectroscopy, thermogravimetric analysis,differential scanning calorimeter and X-ray diffraction were used to study the chemical structure,thermal properties and crystallinity of composite fiber. The relationship between cross-linking degree and fiber morphology was investigated,and the correlation between 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-linked fiber can be reduced to 82. 30% from 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-linked fibers with the cross-linking temperature firstly increases and then decreases,and a longitudinal groove structure exists on the surface of the cross-linked fiber and the non-cross-linked fiber. After the cross-linking,the fiber was treated with salt solution,the surface still has the groove structure.