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Condensation polymer
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<p>In <a href="/facts/Polymer_chemistry/wdfr6fs4">polymer chemistry</a>, condensation polymers are any kind of <a href="/facts/Polymer/eF32E50K">polymers</a> whose process of <a href="/facts/Polymerization/1hmBz7Ur">polymerization</a> involves a <a href="/facts/Condensation_reaction/wMG0F6La">condensation reaction</a> (i.e. a small molecule, such as <a href="/facts/Water/0lkXnJPK">water</a> or <a href="/facts/Methanol/EIfpoNCg">methanol</a>, is produced as a byproduct). Natural <a href="/facts/Protein/Jxmagu3E">proteins</a> as well as some common plastics such as <a href="/facts/Nylon/hBvG9bCw">nylon</a> and <a href="/facts/PETE/Sc5UhmCB">PETE</a> are formed in this way. Condensation polymers are formed by polycondensation, when the polymer is formed by condensation reactions between species of all <a href="/facts/Degree_of_polymerization/1WYmrcNk">degrees of polymerization</a>, or by condensative <a href="/facts/Chain-growth_polymerization/ltonCdDy">chain polymerization</a>, when the polymer is formed by sequential addition of monomers to an <a href="/facts/Active_site/u9ua7rGu">active site</a> in a <a href="/facts/Chain_reaction/5UwHTKXS">chain reaction</a>. The main alternative forms of polymerization are chain polymerization and <a href="/facts/Polyaddition/Ce733KSg">polyaddition</a>, both of which give <a href="/facts/Addition_polymer/RIUV7QfI">addition polymers</a>. </p> <p>Condensation polymerization is a form of <a href="/facts/Step-growth_polymerization/MHMGpt0g">step-growth polymerization</a>. Linear polymers are produced from <a href="/facts/Bifunctional/v0uJeNGE">bifunctional</a> monomers, i.e. compounds with two reactive <a href="/facts/End-group/scTJ3Xga">end-groups</a>. Common condensation polymers include <a href="/facts/Polyester/Ivp9CHpl">polyesters</a>, <a href="/facts/Polyamide/8AmQgTFa">polyamides</a> such as <a href="/facts/Nylon/hBvG9bCw">nylon</a>, <a href="/facts/Polyacetal/TFrYKSx7">polyacetals</a>, and <a href="/facts/Protein/Jxmagu3E">proteins</a>. </p>