multifibre strip acetate cotton nylon polyester acrylic wool
TRANSCRIPT
Multifibre Strip
Acetate
Cotton
Nylon
Polyester
Acrylic
Wool
What is the chemical make up of the different fibres?
• Nylon – has NH3 groups at end of the polymer chain only. Has amide bonds allowing for H Bonds. Relatively non polar
• Polyesters – relatively non polar, can’t H bond
• Cotton – lots of OH group so can H bond
Acid BlueWhat functional groups does it have and what do they confer on the molecule?
Acid Blue
Acetate
Cotton
Nylon
Polyester
Acrylic
WoolWhat fibres does acid blue dye – can you explain the pattern of dyeing in terms of the chemical composition of the dye and the fibres?
Acid Blue
Acetate
Cotton
Nylon
Polyester
Acrylic
Wool
Acid Blue dyes nylon and wool because it can form Hydrogen bonds with the N-H groups on the nylon and wool fibres. The SO3-groups also form strong ionic attractions with the NH groups on the nylon can also dye cotton because it can form Hydrogen bonds with the fibres.
Disperse YellowWhat functional groups does it have and what do they confer on the molecule?
Disperse Yellow
Acetate
Cotton
Nylon
Polyester
Acrylic
Wool
What fibres does disperse yellow dye – can you explain the pattern of dyeing in terms of the chemical composition of the dye and the fibres?
Disperse Yellow
Acetate
Cotton
Nylon
Polyester
Acrylic
Wool
Disperse yellow dyes both nylon and wool because it bonds by Instantaneous induced forces to the fibres. It does not dye cotton because it can not form sufficient Hydrogen bonds with the cotton fibres.
Direct RedWhat functional groups does it have and what do they confer on the molecule?
What would expect this molecule to dye? Explain giving your reasons.
Direct Red
Acetate
Cotton
Nylon
Polyester
Acrylic
Wool
What fibres does Direct Red dye? – can you explain the pattern of dyeing in terms of the chemical composition of the dye and the fibres?
Acetate
Cotton
Nylon
Polyester
Acrylic
Wool
Direct red dyes cotton. The big dye molecule aligns itself along the cotton fibres allowing H bonding to take place between the dye and the fibre. The sulphate groups form strong ionic interactions with the NH gps on the nylon and wool.
Direct Red