超吸水改性棉纤维膜的制备及其性能

为制备具有较高吸水性及稳定性的超吸水纤维膜,首先利用氯乙酸对NaOH碱化处理后的棉纤维进行改性制备吸水纤维,然后通过溶液分散法将吸水纤维在水中分散成膜制备超吸水纤维膜材料.对纤维膜材料的表面结构、化学结构、结晶结构、热稳定性、羧甲基取代度、吸水性能及力学性能进行表征与分析.结果表明:对棉纤维进行碱化处理可促进氯乙酸与棉...

Preparation and performance of super absorbent modified cotton fiber membrane

In order to prepare super absorbent fiber membranes with higher water absorption and stability,the cotton fibers alkalized by NaOH were modified by the chloroacetic acid to enhance the water absorbence,and then the water-absorbent fibers were dispersed in water to prepare a super absorbent fiber membrane material.The surface structure,chemical structure,crystalline structure,thermal stability,the degree of carboxymethyl substitution,water absorption and mechanical properties of the fiber membrane material were eveluated and analyzed.The results show that alkali treatment to cotton fiber can promote the substitution reaction between chloroacetic acid and cotton fiber,and the amount of chloroacetic acid directly affects the degree of carboxymethyl substitution of cotton fiber,which has an important impact on the improvement in water absorption performance of the membrane.However,too high a dosage will significantly reduce the tensile strength of the fiber membrane.When the degree of carboxymethyl substitution is about 0.264,the shape of the absorbent fiber membrane material remains relatively complete after absorbing water,and has generally good mechanical properties,and its water absorption rate can reach 163.3 times,with the water retention rate reaching more than 73.7 times.