CHM334: EFFORTLESS APPROACH ON COLOUR AND TEXTILE CHEMISTRY

By | October 1, 2019

CHM 334 COLOUR AND TEXTILE CHEMISTRY ( COURSE OUTLINE)
  • Colour and constitution.
  • Physical and chemical properties of dyes and textiles.
  • Classification of dyes and fibres.
  • Dyeing synthetic fibres.
  • Preparation and dyeing of natural and synthetic fibres.
  • Colour fastness properties.
  • Quality control procedures in the textile and dye industries.

MATERIAL ONE : WHAT YOU SHOULD KNOW

PART A

EFFORTLESS APPROACH ON COLOUR AND TEXTILE CHEMISTRY

– Explain briefly the origin of colour.
-Mention the relationship between colours and the eyes
– What are the factors that determine the colour of an object?
– State which colour you would expect for both additive and subtractive mixtures of:
.Red plus green
. Red plus yellow plus blue
. Cyan plus yellow
– 1(c)Explain briefly using two examples the terms
. chromophores and
. auxochromes
– 1(d) Give a structural formula of a colorant for each of your named chromophores in 1(c) above
-Indicate the class of each colourant in 1(d) above
– Explain briefly using specific examples the class of dyes that are used specifically for the following fibres
. cellulosic
. nylon and wool
. Polyester
. acrylic
– What are the different between pigments and dyes?
– Mention six (6) important features of pigments
– What are the essential structural features of vat dyes?

– Distinguish between elastomers and fibres
– What are the major intermolecular forces in fibres
– Illustrate with specific examples the difference between natural and synthetic fibres
– Why are synthetic dyes not easily commercialized in our society?
– List the three general methods of dyeing
– How can wool and cotton materials be pre-treated before dyeing?
– List four dye printing methods
– Why are many dyes converted to sulphonated sodium salt before being marketed?
– What is the danger of high dyeing?
-Show how a dye can make multiple intermolecular hydrogen bonds with cellulose fibre.

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– In tabular form, give one difference between the circulating machines and circulating goods machines used for textile dyeing.
– What is dye fixation?
– Show how a dye can make multiple intermolecular hydrogen bonds with cellulose fibre.
– illustrate the formation and consecutive oxidation of a hair-dye from primary intermediate and coupler
– Show the covalent bond interaction of a triazine (reactive) dye with a cellulose fibre mercerised in sodium hydroxide.
– In tabular form, state one difference between Acid-leveling dyes and acid-leveling dyes
– What is colour fastness? List four fastness properties that can be determined on a dyed
– List four anchor components of reactive dyes that determine both the fixing properties and the wet-fastness of a dyed material.
– Many dyes are known to be toxic, especially carcinogenic. Give one common examples
– Give one example each of a .primary intermediate . developer and . coupler used for hair dyeing.
– Showing equation of reaction only, illustrate how Alizarine Pure Blue B, a sulphonated Textile amino anthraquinone can be prepared.
-Distinguish between running and fading of either a toxic dye metabolite or dye moiety.

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MATERIAL ONE : WHAT YOU SHOULD KNOW

PART B

EFFORTLESS APPROACH ON COLOUR AND TEXTILE CHEMISTRY

-Differentiate between natural and synthetic pigments
– What is colour
– Distinguish between primary colors and secondary colors
– What are the basic features of a dye?
– In tabular form, list six fibre materials that can be dyed, the symbol used to represent them and the
appropriate dye used for them.
– What is the danger of high dyeing?
– Mention three roles of retarders employed in cationic or anionic dyeing
– Show the covalcnt bond interaction of a triazine (reactive) dye with a cellulose fibre merceriscd in sodium hydroxide.
– Using structure alone, show how a dye can make multiple intermolecular hydrogen bonds with cellulose fibre

 

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