Homework_2_CHM 4272

Homework_2_CHM 4272 - 5 In the boxes provided below give...

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CHM 4272 _______________________________ Homework #2 name Spring 2011 1. Give the monomers required to form the following polymers, or the polymers that form from the reaction of the given monomers. Classify the polymerizations as to whether they are step-growth, chain growth, or ring-opening. Classify the polymers as to whether they are condensation or addition types. (a) (b) (c) (d) (e) Cl n H 3 C CH 3 n N O O n
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2. Ziegler Natta (Coordination) polymerization can be modeled by a mono-metallic and a bi-metallic chemical system. Give a mechanism for the polymerization of propylene initiated using the TiCl 4 and AlEt 3 initiator system using a monometallic model. 3. Draw a series of repeat units for polypropylene [(-CH 2 -CH(CH 3 )-)n] that allow illustration of an isotactic and a syndiotactic structure. (a) Isotactic (b) Syndiotactic 4. The free radical polymerization of ethylene (C 2 H 4 ) leads to a polymer containing both long and short branches. Give mechanisms that show how both of these types of branching occur.
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Unformatted text preview: 5. In the boxes provided below, give the structures for the reactive intermediates that form when acrylonitrile [CH 2 =CH-CN] is initiated using a reducing electron transfer initiator such as sodium naphthalide. Hint: Remember that a reactive intermediate can be radical, anionic or cationic in form. 6. Fill in the blanks. a. An cationic polymerization of a substituted alkene is facilitated by an electron _______________ pendant group. b. A more polar solvent causes a cationic polymerization to proceed with a faster or slower rate. ________________________ c. A(n) ____________________ polymerization is one in which all of the chains are initiated simultaneously and there are no intrinsic termination reactions. d. A(n) ____________________ polymerization method is used to condense monomers which contain two terminal alkenes. e. A vinyl polymer is said to be ____________________ when the stereochemical configuration alternates along the polymer chain....
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This note was uploaded on 05/29/2011 for the course CHM 4272 taught by Professor Reynolds during the Spring '11 term at University of Florida.

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Homework_2_CHM 4272 - 5 In the boxes provided below give...

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