Lab 9- Nylon 6,10 - CHEM 5384 Polymer Characterization II...

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CHEM 5384 Polymer Characterization II Lab 9: Nylon 6,10: Interfacial Polymerization Mengfang Li 04/02/2013
Introduction: The main purpose of this laboratory experiment is to synthesize membranes of Nylon 6, 10 by unstirred interfacial step polymerization of hexamethylene diamine (HDMA) and sebacoyl chloride. And to observe the quality of the nylon film produced as a function of the rate of removal. Step growth polymerization is one of the main types of polymerizations. In step polymerization the chain can grow by addition of monomers, oligomers or polymer chains. For example, a tetramer could be formed from two different ways: (1) addition of monomer to a trimer or (2) reaction of two dimers. Only first route will occur in chain polymerization. In comparison, step polymerization involves bifunctional (AB or AA) type monomers. Examples of step polymerization where two different monomers are involved [1]: Addition of a monomer to a chain of three-monomers (a trimer), or 1 + 3 [1]: A*A + B***B -> A****B + AB (1a) Addition of two chains of two-monomers (dimers) to each other, or 2 + 2 [1]: A**A + B**B -> A****B + AB (1b) Some step polymerization can take place even with only one monomer presents (ie. Synthesis of nylon 11), the two functional groups on the monomer have to be different: Nylon is an example of polyamide, which is a polymer where monomers are connected by amide groups. Under high monomer concentrations, the reaction proceeds via polycondensation of diacid and diamine monomers. For every n moles of monomer in the chain, the process creates (n-1) moles of HCl as a byproduct[2]. Since melt polycondensation have disadvantages in terms of efficient polymerization, interfacial polymerization is an excellent alternative method to produce nylon. The rapid kinetics of the reaction between diacid and diamines ocurrs at the interface of two immiscible

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