define condensation polymer.
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Answer:
PRINCIPLES OF CONDENSATION POLYMERIZATION
A condensation polymerization is a form of step-growth polymerization. Small molecules react with each other to form larger structural units while releasing smaller molecules as a byproduct, such as water or methanol. A well-known example of a condensation reaction is the esterification of carboxylic acids with alcohols. If both moieties are difunctional, the condensation product is a linear polymer, and if at least one of the moieties is tri- or tetra-functional, the resulting polymer is a crosslinked polymer (i.e. a three-dimensional network). Adding monomers with only one reactive group will terminate a growing chain, and consequently lower the (average) molecular weight. Thus, the average molecular weight and the crosslink density will depend on the functionality of each monomer involved in the condensation polymerization and on its concentration in the mixture.
A classic step-growth condensation is the reaction between a dibasic acid and a glycol, shown below:
HOOC–(CH2)n–COOH + HO–(CH2)m–OH →
HOOC–(CH2)n–COO–(CH2)m–OH + H2O
The resulting polymer is called a polyester. The by-product water is removed from the reaction system because it is reactive with ester linkages to reverse the reaction.
One of the most common thermoplastic polyesters is poly(ethylene terephthalate), often abbreviated PET or PETE:
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Answer:
Condensation polymers are any kind of polymers formed through a condensation reaction—where molecules join together—losing small molecules as byproducts such as water or methanol. ... The main alternative forms of polymerization are chain polymerization and polyaddition, both of which give addition polymers.