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Exam 29: Organic Polymer Chemistry

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Question 31

Multiple Choice

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MATCH a term or structure from the list below to each of the following definitions or names. Place the letter of the term or structure in the blank to the left of the definition or name which it describes. -____ A polyurethane

A) crystallite
B) elastomer
C) chain-growth polymer
D) Al(CH₂CH₃) ₃ + TiCl₄
E)
F)
G) thermoplastic
H) homopolymer
I) T_m
J) epoxy resins
K) copolymers
L) step-growth polymer
M) "catalyst"
N) T_g
O)
P)

Q) F) and P)
R) B) and F)

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Question 32

Multiple Choice

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Which type of polymerization is used to make high density polyethylene (HDPE) ?

A) anionic
B) cationic
C) radical
D) Ziegler-Natta

E) A) and B)
F) All of the above

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Question 33

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Provide the structure of the poly(lactic acid) that is formed by base catalyzed ring opening polymerization of the dilactone shown below.

Provide the mechanism whereby two radical chain ends undergo dispropotionation to give two dead chain ends.

Which of the following combinations of terms best describes the polymerization of propene to form polypropylene?

The name of the polymer formed by the molecule shown below is _________________.

Consider the structure shown below. This is an example of a. a polyurethane b. a polyester c. a polyamide d. a polycarbonate

What type of intermediate is formed in the polymerization of styrene with AIBN?

Provide the structure of poly(methyl methacrylate).

What is the name of the following polymer?

Which of the following combinations of terms best describes the polymerization of a diol and a diacid to form a polyester?

What type of polymer is shown?

What type of polymer is shown?

High degrees of crystallinity are associated with polymers with weak intermolecular forces.

Provide the mechanism for backbiting of a radical chain end of polyethylene, which results in a butyl side chain on the polymer backbone.

A good initiator for a free radical addition polymerization is acetyl chloride.

Which type of polymerization is initiated by a mixture of naphthalene and sodium metal?

The following is an example of a polyurethane.

Consider the following two structures. The following represents the repeating unit of the polymer formed by these two substances.

A polymer has the repeating unit drawn below: The two monomers used to make the polymer are shown below.