Lab 1- ATRP - CHEM 5384 Polymer Characterization II Lab 1 Atom Transfer Radical Polymerization of styrene Mengfang Li Introduction In this experiment we

Lab 1- ATRP - CHEM 5384 Polymer Characterization II Lab 1...

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CHEM 5384 Polymer Characterization II Lab 1: Atom Transfer Radical Polymerization of styrene Mengfang Li 01/29/2012 Introduction: In this experiment we were introduced the method to control a radical process to prepare well- defined and functionalizable polymers. Over 100 billion pounds of synthetic polymers were produced each year in United alone. Chain polymerization accounts 80% of these and by far free radical polymerization is the most commonly used reaction method in this category [1] . Radicals are very reactive and add quickly across the double bond to form polymers. This process will terminate if the chain end reacts with another radical. This can be observed by plotting the molecular weight as a function of conversion of monomer into polymer. As shown in Figure 1 for conventional method, high molecular weights are obtained at low conversion and remain at approximately same level throughout the reaction. The initiator (eg. BPO or AIBN) decomposes
Figure 2. Mechanism of atom transfer radical polymerization (ATRP)

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