Addition+Polymerization

Addition Polymerization Joe and Shelby

toc = = = = = = = = = = = = = = = = = Introduction: = Addition Polymerization is a chemical reaction in which simple molecules, called monomers, are added to one another to form long-chain molecules, called polymers without by-products. The molecules of the monomers join together, and the polymeric product is formed of repeating units, and is identical with that of the monomer. The molecular weight of the polymer is the total of the molecular weights of the monomers.

= **Examples**: = ﻿﻿This table shows a few examples of Monomers, becoming polymers through addition polymerization. Mono meaning one, and poly meaning many.


 * **Monomer Name ** || **Polymer **
 * Name ** ||
 * **Ethene ** || **Polyethene ** ||
 * **Propene ** || **Polypropene ** ||
 * **Vinyl Acetate ** || **Polyvinylacetate ** ||
 * **Styrene ** || **Polystyrene ** ||



= Reaction Mechanism: = There are many types of mechanisms involved with addition polymerization, one of the more common is the polymerization of ethene (CH2=CH2), making the product polyethene. (C2H4)n.

<span style="font-family: 'Comic Sans MS',cursive; font-size: 20px; line-height: 29px;">Step 1 (Initiation): <span style="font-family: 'Comic Sans MS',cursive; font-size: 20px; line-height: 29px;">A peroxide molecule breaks into two reactive and free radicals. The energy is derived from heat or light.



<span style="font-family: 'Comic Sans MS',cursive; font-size: 20px; line-height: 29px;">Step 2: <span style="font-family: 'Comic Sans MS',cursive; font-size: 20px; line-height: 29px;">The free radical initiator attaches to a monomer molecule, forming a new free radical, called the activated monomer. The double bond is broken on the ethylene during this step as well, this free radical is now very reactive, because they are unstable and want to be back in a stable state.

<span style="font-family: 'Comic Sans MS',cursive; font-size: 20px; line-height: 23px;">Step 3 (Propagation): <span style="font-family: 'Comic Sans MS',cursive; font-size: 20px; line-height: 23px;">This is the step that creates the chain that continues on. In this phase, the activated monomer attaches to the double bond of another monomer molecule, this repeats again and again.

<span style="font-family: 'Comic Sans MS',cursive; font-size: medium;"><span style="font-family: 'Comic Sans MS',cursive; font-size: 20px; line-height: 23px;"> <span style="font-family: 'Comic Sans MS',cursive; font-size: 20px;">﻿﻿Step 4 (Termination): <span style="font-family: 'Comic Sans MS',cursive; font-size: 20px;">This is the ending process to the chain, this happens when the polymer chain joins with another free radical. The two free radicals join to make a stable bond. <span style="font-family: 'Comic Sans MS',cursive; font-size: 20px; line-height: 0px; overflow: hidden;"> = Video Example: = [] = =

= References: =

<span style="font-family: 'Arial Black',Gadget,sans-serif;">"Chemistry Tutorial : Polymers and Polymerization." AUS-e-TUTE for Astute Science Students. Web. 07 Nov. 2010. <http://www.ausetute.com.au/polymers.html>. <span style="font-family: 'Arial Black',Gadget,sans-serif;"> "Addition Polymer - Discussion and Encyclopedia Article. Who Is Addition Polymer? What Is Addition Polymer? Where Is Addition Polymer? Definition of Addition Polymer. Meaning of Addition Polymer." Welcome to Knowledgerush. Web. 09 Nov. 2010. <http://www.knowledgerush.com/kr/encyclopedia/Addition_polymer/>. <span style="font-family: 'Arial Black',Gadget,sans-serif;"> Category, By. "Addition Polymerization." About Composites – Learn about Plastic and Composite Materials. Web. 04 Nov. 2010. <http://composite.about.com/library/glossary/a/bldef-a132.htm>. <span style="font-family: 'Arial Black',Gadget,sans-serif;">Way, By The. "Addition Polymerization." MWM - Science Modules: An Inquiry and Design-Based STEM and Materials Education Program. Web. 09 Nov. 2010. <http://www.materialsworldmodules.org/resources/polimarization/3-addition.html> <span style="font-family: 'Arial Black',Gadget,sans-serif;">"YouTube - ADDITION POLYMERIZATION." YouTube - Broadcast Yourself. Web. 09 Nov. 2010. <http://www.youtube.com/watch?v=hbu71zsAdDU>. <span style="font-family: 'Arial Black',Gadget,sans-serif;">"File:PolymerizationDP1-EN-C.jpg." Yu-Gi-Oh! Web. 09 Nov. 2010. <http://yugioh.wikia.com/wiki/File:PolymerizationDP1-EN-C.jpg>.