18.3 Condensation polymerisation Flashcards
What is so different between condensation polymerization and addition?
In addition you need a C=C double bond, but CONDENSATION doesn’t depend on it.
In condensation, 2 types of monomers join, son2 functional groups are there
In condensation They join at their functional groups by eliminating a small molecule (Doesn’t ALWAYS have to be water)
In making Nylon, describe the reaction that takes place?
At the ends of the monomers their is a repeating unit, so it is the monomers functional group.
You express the rest of the molecules as blocks for simplicity
You join the ends, 2 things react (usually hydrogen and a halogen is formed.
What ever is formed is what is lost, then you join the monomers. This is called an amide linkage.
Join the to elements that lost an element for it to be eliminated.
What is an amide linkage?
The group where the monomers join.
What is the difference between a polyAMIDE, and a polyESTER?
In polyAMIDES the molecules are linked together by amide linkages (chemical bonds)
In polyESTERS the molecules are connected together by ester linkages. (Chemical reaction between acid and alcohol
How is nylon and terylene made?
By a condensation reaction
How can you make nylon in the school lab?
Dissolve the 1st substance in water and the 2nd in an organic solvent that will not mix with a he water.
(The 2 solvents are in the same brake over each other)
The nylon forms where the 2 solutions meet
How is terylene made?
It is like nylon, both are condensation polymerization, BUT the use different monomers.
To make terylene you have A carboxylic acid and an alcohol, as the functional groups that take part in the reaction.
This time the product is a POLYESTER and Water is being eliminated.
Thousands of molecules join the ends of the ends of the monomers to give terylene.
The part where the monomers join in this reaction is called an ester linkage.
What is an ester linkage?
The link between a carboxylic acid and an alcohol
What is nylon used for?
Thread, ropes fishing nets, car seat belts, carpets
What is terylene used for?
Clothing, bed linen, is woven with cotton to make a fabric that is more hard-wearing than Cotten (does not crease easily)
