MIT 3 034 - Interfacial Polymerization (3 pages)

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Interfacial Polymerization



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Interfacial Polymerization

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Pages:
3
School:
Massachusetts Institute of Technology
Course:
3 034 - ORGANIC AND BIOMATERIALS CHEMISTRY
ORGANIC AND BIOMATERIALS CHEMISTRY Documents

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WARNING NOTICE The experiments described in these materials are potentially hazardous and require a high level of safety training special facilities and equipment and supervision by appropriate individuals You bear the sole responsibility liability and risk for the implementation of such safety procedures and measures MIT shall have no responsibility liability or risk for the content or implementation of any material presented Legal Notice 3 034 FALL 2005 ORGANIC AND BIOMATERIALS CHEMISTRY LABORATORY EXPERIMENT 2 Interfacial Polymerization PreLab Questions 1 In Nylon 8 6 what do the numbers 8 and 6 specifically refer to 2 Describe step growth How many ways can a 7 unit polymer form by step growth using only two monomers in only one step 3 034 FALL 2005 LABORATORY 2 I Introduction Step growth polymerization is one of the main types of polymerization reactions in synthetic polymer chemistry Initially monomers combine to form oligomers and polymer chains are formed by the stepwise combination of monomers oligomers or other polymer chains During this reaction a byproduct may be formed If the byproduct of the step growth reaction is a small molecule such as water or HCl the step growth reaction is termed polycondensation An illustration of stepwise growth is given here for a four unit polymer where each is a monomer and A and B are the functional groups at the end of the monomer This polymer could be formed in one of two ways Addition of a monomer to a chain of three monomers a trimer or 1 3 A A B B A B AB 1a Addition of two chains of two monomers dimers to each other or 2 2 A A B B A B AB 1b Similarly there are two ways to directly form a five unit polymer from only two monomers and three ways to form a six unit polymer Nylon is an example of a polyamide which is a polymer where monomers are connected by amide groups C O NH At high concentrations of the monomer the reaction will proceed via polycondensation of diacid or diamine monomers Diacid or diamine condensation



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