Question

How can you differentiate between addition and condensation polymerisation?​

Answer 1

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$\huge \color{pink} \underline \color{seagreen} \underline \color{pink} \tt\star \: QUESTION \: \star$

How can you differentiate between addition and condensation polymerisation?

$\huge \fbox \color{pink} \: ANSWER \:$

The main difference between addition and condensation polymerization is that in addition polymerization the polymers are formed by the addition of monomers with no by-products whereas in condensation polymerization, the polymers are formed due to the condensation more than one different monomers resulting in the formation of small molecules such as HCl, water, ammonia, etc., as by-products.

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Answer 2

In addition polymerization, the fundamental process is an addition reaction to the double bonds. A species called an initiator, first adds to the double bond of an alkene, yielding a reactive intermediate that in turn adds to a second alkene molecule to produce another reactive intermediate, and so on.

Figure :- ( refer to Attachment (i) )

Here, In = Initiator and Ⓢ represents a substituent, such as $\large\rm { H, CH_{3} , Cl, C_{6} H_{5}}$ etc.

in addition polymerization , $\large\rm { \pi}$ - bonds are broken and the electrons are used to form new $\large\rm { \sigma}$ - bonds between the monomer units.

in condensation polymerisation, molecules with two functional groups react, e.g.,ba carboxylic acid reacts with an amine to yield an amide. if a molecule with two carboxylic groups react with a molecule having two amine groups, An initial reaction joins the two molecules togethor and further reaction then join more and more molecules togethor until a giant polyamide chain results, e.g., in Nylon 66.

for figure refer to Attachment (ii)

in condensation polymerisation, small molecules are found to form polymers using condensation reactions.