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Polymerization describes the formation of of large molecules (polymers) with repeating structure from smaller molecules (monomers) . The word polymer comes from Greek words meaning many (poly-) and parts (-mer). Many of the resulting molecules are plastics, so polymer is occasionally used in place of the word plastic, though this is not an accurate usage. Polymerization is an all-encompassing term that describes formation of polymers by any method.

There are two main types of polymerization; addition polymerization and condensation polymerization. Addition polymerization creates larger molecules by opening up double bonds on the smaller molecules (monomers). These opened-up bonds react with parts of other monomers (single part) to form dimers (double part). This reaction can repeat to add another molecule to for a trimer (three part). This continues until you obtain the right size molecule and you stop the reaction. Addition polymerixation can occur using a single type of monomer. There are no by products of the reaction except the longer chain molecules (polymers).

In condensation polymerization, two monomers of different types are used. They have different types of reactive (or functional) groups on them. A reaction between monomer A and monomer B results in a dimer, plus another small molecule (often water) that is not part of the polymer. To create long polymers the monomers must have reactive groups on both ends or a chain cannot be formed.

Polymerization is an all-encompassing term for creating polymers by any method. Condensation Polymerization is a term denoting a specific type of reaction for creating polymers.

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15y ago
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12y ago

the structural unit of step reaction polymerization are chemically identical to the monomer employed in the reaction while those of the chain reaction may or may not be identical

addition or step polymers take their names from their starting monomers while those of the chain reaction is not so

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9y ago

The are severalÊ difference between addition and condensation polymerization.ÊThey include,Ê in addition polymerization monomers join up to form single substance without loss of any molecule unlike the later where there is loss of molecules,Ê reacting monomers have multipleÊ bondÊ in addition polymerization unlike the later whereÊ only functional groups of two monomers react, saturated monomers react in additional polymerization while the later involve unsaturated molecules and additional polymerization is a rapid process that produce high molecular weight polymers.

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12y ago

Addition P - monomers join together to give a single product without loss of any molecule .

- exp : ethene to polyethene

n(ch2=ch2) -> --{--ch2-ch2-ch2-ch2--}--n

Condensation P - monomers join together in which a small molecule is remove such as h20 or HCl

- 1. Polyester (repeating unit held together by ester bond )

a. RCOOH + HOR -> RCOOR + H2O

carboxylic acid + alcohol

b. RCOOCl + HOR -> RCOOR + HCl

-2. Polyamides (monomers held together by peptide bond/ amide linkage )

a. RCOOH + NH2R -> RCONHR + H2O

b. RCOOCl + NH2R -> RCONHR + HCl

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12y ago

In condensation polymerization by product is produced such as water or other small molecules. In addition polymerization no by products are produced.

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14y ago

Condensation polymers loose watermolecules during polymerisation, whereas Addition Polymers do not.

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11y ago

Thermoplastic polyureathane production is addition polymerization

Polyol production is condensation polymerization

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10y ago

Generally condensation polymers are stronger. But there may be some exceptions.

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Q: What are the similarities between addition polymerization and condensation polymerization?
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