Chemistry Coursework

In Polymerisation the term ‘addition polymerisation' is when there are small unsaturated starting molecules which are called monomers and they join together to form a long saturated polymer that has a double bond this is called a ‘free radical'

eg: A + A + A + A A-A-A-A

During the Polymerisation of Ethene thousands of ethane molecules join together to form the polymer poly (ethene) the number of ethene molecules that join up is variable but is usually in the region of 2000 – 20000.


Conditions that are needed to polymerise ethene to form ldpe:
Conditions
Temperature: about 200°C
Pressure: about 2000 atmospheres
Initiator: a small amount of oxygen as an impurity

The Mechanism that is used for this process is called the free radical addition. There are three Stages in the polymerisation of ethene:

Stage 1: Initiation

This is where the chain is initiated by free radicals, Ra , produced by reaction between......

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Title: Chemistry Open Paper
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