org chem 3 lab.docx - Dyes and Dyeing Sherin Mathukutty...

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Dyes and Dyeing Sherin Mathukutty CHM-250 LAB#4 09/16/16
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Abstract Aim:- The main purpose of the lab was to examine how substituent on a fiber influence and how the fiber reacts with dyes. Approach:- The technique we used to examine this lab was synthesis of diazonium, Methyl Orange and dyeing. The intensity of a dyes on a fiber depend on the number of strongly polar or ionic groups in the fiber molecule. Results: We can figure out the intensity by the method of methyl orange and we can order the fiber molecules according to the polarity. There are 13 strips of different fibers woven Multifiber Fabric. The fibers are in the orders of polarity start with acetate rayon, SEF, Arnel, Cotton, Creslan, Dacron 54, Dacron 64, Nylon 6.6, Orlon 75, Silk, Polypropylene, Viscose rayon, and wool. Introduction Dyeing is the process of applying color to fiber. Fiber usually absorb dyes from aqueous solution. Dyes go through the pores of fiber and bound to the fiber by electrostatic forces, van der waals attraction,hydrogen bonding, and covalent bonds. Dyes are soluble in water and which is used to color substrates to which they have affinity. Acetate rayon is cellulose which has smallest number OH groups which is 2 in each unit which compared to cotton . Cotton makes
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