Study On The Structure And Properies And Application Of The Hollow Viscose Fiber

The raw materials of regenerated cellulose fiber are wide and the fiber is renewable so it has been more and more popular. The hollow viscose fiber, one of the important functionalizations of the regenerated cellulose f iber, owns many advantages, like the obvious hollow structure, low density, good water absorption, excellent bulkiness, brilliant warmth retention property, super permeability and so on. So it’s important to research and develop the hollow viscose fiber and more value can be got by developing the high-level and multi-functional textiles made of the hollow viscose fiber. This article, on the basis of studying the basic structure and properties of the hollow viscose fiber, some other experiments have also been done, including the researches on the properties change of hollow viscose fiber after being dealt with acid, alkali, oxidative and reductive reagents with different concentrations compared with the original and researches on the aspects of applications, like compression, oil-sorption property and warmth retention property. All these studies will provide some theoretical support for the practical application of the hollow viscose fiber. the main conclusions were obtained as follows:(1) After analyzing the structure of the hollow viscose fiber and comparing with the conventional viscose fiber, modal and lyocell, it could be noticed that: the length, diameter and linear density of fiber were 35.3mm, 18.45μm, 1.68 dtex, respectively, except the longest diameter, the length and linear density were similar to those of other three fibers; The surface morphology of the hollow viscose fiber existed the grooves, the cross section of fiber showed the oval sharp, hollow structure was very obvious and the percentage of hollowness was 60%, the inner wall was smooth and both ends displayed partly close, for few fibers, some splits existed on the surface; The crystallization of the hollow viscose fiber was 31.73%, showing lower than the conventional viscose fiber, and the hollow viscose fiber also presented obvious characters of cellulose II structure; In addition, the chemical composition of the hollow viscose fiber was the same with other three fibers.(2) For the hollow viscose fiber, the breaking strength was worst of all four fibers, little worse than that of the conventional viscose fiber, under wet condition, the breaking strength of the fiber decreased to some extent versus the dry ones, adversely, the elongation enhanced; The friction performance of the hollow viscose fiber was similar with other three fibers and the contact angle was 63.3o, implying the good hydrophilicity; The moisture regain of the hollow viscose fiber was 12.38%, suggesting lower than that of the conventional viscose fiber, but the tests of the moisture absorption and liberation showed the hollow viscose fiber owned good moisture absorption and liberation rate; Additionally, the thermal stability of the hollow viscose fiber was litter worse but this could be ignored.(3) After being dealt with acid and alkali reagents, the breaking strength of the hollow viscose fiber decreased and the breaking elongation enhanced, but being dealt with oxidative and reductive reagents, both the breaking strength and the breaking elongation decreased; When fiber was dealt with different reagents, the loss rate of breaking strength was decreasing with the increase of the concentration of different reagents; When dealt with different reagents, the crystallization of the hollow viscose fiber increased in the initial stage and then decreased latter, but the chemical composition kept the same with the original.(4) As to the applications of the hollow viscose fiber, the results showed that: the bulkiness of the fiber assemblies was the best of all, but the recoverability was common, the fiber assemblies were prone to being compressed and compared with the original the hollow viscose fiber assemblies the percentage of hollowness could nearly decrease by 40% after being c ompressed; In regard to the oil-absorption properties, the oil-absorption and oil-retention rates of the hollow viscose fiber were good, superior to the common natural fibers and the conventional viscose fiber, however, the oil-removal efficiency and oil-water selectivity were bad because of the good hydrophilicity of the fiber; Additionally, the warmth retention property of the hollow viscose fiber assemblies was the best of all, especially the thermal resistance per 100 grams was the best.