Condensation polymer - wikipedia Condensation polymer This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( September 2015 ) 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, as opposed to addition polymers which involve the reaction of unsaturated monomers. Condensation polymerization is a form of step - growth polymerization, is a process by which two molecules join together, resulting in loss of small molecules which are often water. The type of end product resulting from a condensation polymerization is dependent on Monomers with only one reactive group do not padlock a growing chain, and thus give end products with a lower molecular weight. Linear polymers are created using monomers with two reactive end groups and monomers with more than two end groups give three - dimensional polymers which are cross linked. Common condensation polymers include polyamides, polyacetals and Proteins. Dehydration synthesis often involves joining monomers with an - OH ( hydroxyl ) group and a freely ionized - H on either end ( such as a hydrogen from the - NH in nylon or proteins ). Normally, two or more different monomers are used in the reaction. The bonds between the hydroxyl group, the hydrogen atom and their respective atoms break forming water from the hydroxyl and hydrogen, and the polymer. Actually in this process two water molecules are released.As given below ( n + n = 2n ) Polyester is created through ester linkages between monomers, which involve the functional groups carboxyl and hydroxyl ( an organic acid and an alcohol monomer ). Nylon is another common condensation polymer. It can be manufactured by reacting di - amines with carboxyl derivatives. In this example the derivative is a di - carboxylic acid, but di - acyl chlorides are also used. Another approach used is the reaction of di - functional monomers, with one amine and one carboxylic acid group on the same molecule : General chemical structure of one type of condensation polymer The carboxylic acids and amines link to form peptide bonds, also known as amide groups. Proteins are condensation polymers made from amino acid monomers. Carbohydrates are also condensation polymers made from sugar monomers such as glucose ( i.e. cellulose or glycogen ) and galactose. Condensation polymerization is occasionally used to form simple hydrocarbons. This method, however, is expensive and inefficient, so the addition polymer of ethene ( polyethylene ) is generally used. Condensation polymers, unlike addition polymers, may be biodegradable. The peptide or ester bonds between monomers can be hydrolysed by acid catalysts or bacterial enzymes breaking the polymer chain into smaller pieces. The most commonly known condensation polymers are proteins, fabrics such as nylon, silk, or polyester. See also Wikimedia Commons has media related to Condensation polymerization. Biopolymer Polyester Polyamide Epoxy resins References Jump up ^ Senese, Frederick. `` General Chemistry Online : FAQ : Chemistry of everyday life : What is cellulose ? ''. Frostburg State University. Retrieved 17 April 2015. External links Polymers ( and condensation polymers ) - Virtual Text of Organic Chemistry, William Reusch Retrieved from `` https://en.wikipedia.org/w/index.php?title=Condensation_polymer&oldid=811270276 '' Categories : Polymer chemistry Polymerization reactions Hidden categories : Articles needing additional references from September 2015 All articles needing additional references Talk About Wikipedia Български Čeština Deutsch Eesti Ελληνικά Español Hrvatski Italiano Қазақша Kreyòl ayisyen Magyar Nederlands 日本 語 Polski Português Русский Slovenčina کوردی Українська 中文 Edit links This page was last edited on 20 November 2017, at 15 : 41. Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: what type of polymers have the ester functional group
Answer: monomers