Study On Structure And Properties Of Viscose Fibers Via Butanetetracarboxylic Acid And Hydrolysis Of Polymaleic Anhydride

Along with the oil industry and the coal reserves increasing decline, as well as to attention and concern on the consumption of resources, the use of renewable resources-cellulose is increasingly concerned by the field of research and industry. Viscose fiber are regenerated cellulose fiber, a high moisture absorption, permeability strong, wearing comfortable, inexpensive and easy to degradation products after use, comply with environmental requirements, and many synthetic fibers do not have the fine performance; viscose fibers, however, there are also some disadvantages, primarily its strength is lower, especially in the wet state, easy swelling, fracture strength decreased significantly, to a lesser load, elongation easy, flexible poor, so impatient with fabric washed, easy deformation, size is very unstable. People research and develop a lot of processing methods, in the current, multicarboxylic acid esterification crosslinking treatment is a more ideal method, which can give fibers good performance. Due to the esterification crosslinking reaction of multicarboxylic acid with the fibers, polycarboxylic acids bond will be equivalent to bridge different cellulose molecules connected together to form network crosslinked structure within the fibers, which can give fibers good morphology stability and mechanical properties.Butanetetracarboxylic acid was utilized as a crosslinking agent for the esterification crosslinking of the viscose fibers, the structure and mechanical properties and the water response of the viscose fibers crosslinked by BTCA were studied. Fourier transform infrared spectroscopy proved that the esterification reaction of viscose fibers with BTCA occurred under a certain crosslinking conditions. From scanning electron microscopy, the crosslinked viscose fibers was thicker and its surface was smooth and uniform, the section of the crosslinked viscose fibers was no longer a irregular shape but were round, holes in internal viscose fibers was smaller, indicated that the viscose fibers surface and internal occurred esterification crosslinking reaction, and formed a network crosslinked structure in internal viscose fibers, so that they could give viscose fibers morphology stability and good mechanical properties. The influences of different crosslinking conditions on the esterification reaction of viscose fibers with BTCA were analyzed by acid-base titration, carboxyl conversion rate and crosslinking degree of the viscose fibers was also discussed. Mechanical properties of the uncrosslinked and crosslinked viscose fibers were studied, the results show that the dry or wet initial modulus of the viscose fibers crosslinked by BTCA was increased, dry or wet breaking strength was improved to some extent and the dry or wet elongation at break was diminished. When the percentage of quality of BTCA is 8%, the viscose fibers, crosslinking for 3 min at 180℃, dry and wet initial modulus of the corsslinked viscose fibers respectively reached 57.43 cN/dtex and 15.28 cN/dtex, dry and wet breaking strength have reached the maximum, respectively was 2.56 cN/dtex and 1.46 cN/dtex, increase rate for 20.19% and 23.73%, wet breaking strength increase ratio slightly larger than the dry breaking strength, elastic recovery rate of 46.62%, increase rate of 22.94%; for the viscose fibers crosslinked by BTCA, stress relaxation speed was slower and relaxation time was longer, showing good elastic behavior.Gaseous water response of the uncrosslinked and crosslinked viscose fibers were studied, the results show that the equilibrium moisture regain of the uncrosslinked and crosslinked viscose fibers was increased with the relative humidity increasing and there were all obviously absorption hysteresis phenomena. The water retention value of the uncrosslinked and crosslinked viscose fibers were determined through centrifugal, further research its liquid water response properties, the results show that the water retention value was decreased gradually with BTCA concentration increasing; raising the crosslinking temperature and expanding crosslinking time , the esterification crosslinking reaction of BTCA with viscose fibers can be more fully, the water retention value of the viscose fibers crosslinked by BTCA also will be further reduced. The wet swelling ratio of the uncrosslinked and crosslinked viscose fibers was studied, the results show that wet swelling ratio of the cosslinked viscose fibers was greatly reduced.In addition, the hydrolysis poly-maleic anhydride (HPMA) was also utilized as the crosslinking agent for the esterification crosslinking of viscose fibers in this paper, the structure and properties of the viscose fibers crosslinked by HPMA were studied. Fourier transform infrared spectroscopy proved that the esterification crosslinking reaction took place between HPMA and viscose fibers in a certain crosslinking condition; breaking strength of the viscose fibers crosslinked by HPMA was improved, water retention value was reduced, wet swelling was decreased. Therefore HPMA is a certain role in crosslinking treating viscose fibers to improve its disadvantages, but the increase ratio of breaking strength of the viscose fibers crosslinked by HPMA less than BTCA.