Study of Cellulose Fiber Prepared by Dry-Wet Spinning and Spinning Process of Blending Cellulose/PVA

• Main Authors: Chang, Hung-An, 張鴻安
• Other Authors: Lin Chin-An
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/04976162888487251442

碩士 === 逢甲大學 === 紡織工程研究所 === 86 === In order to shorten the production time for producing and spinning of rayon fibers by two days,many countries have been working on the spinning technique of solution direct spun cellulose fibers.This paper first discusses the solventthat can dissolve fibers and the properties of the solvent.Then,the dry-wet spinning technique is adopted to produce cellulose fibers.In addition,there isfurther discussion which is about the technique of blending the polymers of cellulose and polyvinyl alcohol(PVA).The blended proportions of cellulose and polyvinyl alcohol(PVA) are 90/10 Wt/Wt and 80/20 Wt/Wt. Cellulose and the polymerblend are respectively put into a dry- wet spinning machine at 90*.The fibers arepassed through the processes of water washing and drying.The fibers are hot drawnat 70* one or two ratios of times,1.83 and 7.01. The dry- wet spinning of cellulose fibers and the polymer need an evenly blended solution.The polymer concentration and viscose solution are essential tothe solvent of the spinning.In this paper,there is also a discussion of the materialwhich are needed for this experiment.There are the polymer concentration, the viscosesolution,and the structure,morphology, physical properties of cellulose fibers and the polymer blended.Various techniques such as viscose measurements,tenacity measurements, SEM observation,TGA,X-ray and hot water treament,were adopted. The results of viscosity measurements reveal that the range of cellulose viscosityis between 68000~61000cp. Viscosity varies in accordance with temperature and polymer concentration.The test of tenacity of fibers indicates that the tenacity will increase with the increase of the drawn rate. However,the increase of PVA will reducethe tenacity.The SEM shows that the fiber cross section was nearly a circle.Afterthe test of hot water treament,the middle part of the fiber cross section is damaged.We deduce that the interaction between cellulose and PVA is weak.By the wide angle X-ray diffraction pattern,we find that the circle of the cross section changes gradually into symmetrical arches. From WAXD data,the regenerated cellulose fibersspun from NMMO solution gave the cellulose 2 crystalline unit cell.