Chapter_6_-_Manufactured_Cellulosic_Fibers_-_Fall_2011-Student_Version

Chapter_6_-_Manufactured_Cellulosic_Fibers_-_Fall_2011-Student_Version

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MANUFACTURED CELLULOSIC FIBERS CHAPTER 6 1
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RAYON rayon 1st regenerated fiber a manufactured fiber composed of regenerated cellulose unmodified cellulosic fiber 2
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RAYON Unmodified cellulosic fibers viscose rayon cuprammonium rayon lyocell Modified cellulosic fibers acetate triacetate 3
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VISCOSE RAYON Raw Materials wood pulp cotton fibers 4
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VISCOSE RAYON Raw Materials timber harvested chips treated dissolving pulp 95% cellulose pressed into blotter-like sheets 5
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VISCOSE RAYON Manufacture 1. slurrying ( steeping ) soaked in sodium hydroxide alkali cellulose 2. ageing polymer chains broken easier to dissolve 6
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VISCOSE RAYON Manufacture 3. xanthation carbon disulfide polymers pushed apart 4. in sodium hydroxide viscous like honey 7
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Viscose Rayon Manufacturing Steps 5. filtration insoluble particles removed delustering agent, pigment added 6. extrusion wet spun dilute sulfuric acid bath 8
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VISCOSE RAYON Modifications high-wet-modulus rayon (HWM) modal, polynosic rayon high-tenacity rayon tire cords 9
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VISCOSE RAYON Molecular Structure cellulosic like cotton regular viscose rayon short chains much lower dp lower orientation smaller crystalline/higher amorphous areas HWM rayon 10
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VISCOSE RAYON Properties of Viscose Rayon Physical Properties white bright or dull shape regular rayon serrated/striations HWM less crenulated 11
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VISCOSE RAYON Properties of Viscose Rayon specific gravity moderate like cotton, linen Mechanical Properties strength lower than cotton, linen 12
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Chapter_6_-_Manufactured_Cellulosic_Fibers_-_Fall_2011-Student_Version

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