Chemistry Reference
In-Depth Information
Review Questions
Section 6.1
1. What are the two types of polyethylene that are currently manufactured commercially?
2. Describe the chemical structure of low-density polyethylene produced by free-radical mechanism
and show by chemical equations how all the groups that are present form. How can low-density
polyethylene be prepared by ionic mechanism?
3. Describe conditions and procedure for commercial preparation of polyethylene by free-radical
mechanism, the role of oxygen, and the problems associated with oxygen.
4. Describe a tubular reactor for preparation of polyethylene.
5. What are the industrial conditions for preparations of high-density polyethylene. Describe the
continuous solution process, the slurry process, and the gas-phase process.
6. Show with chemical reactions how polymethylene forms from diazomethane.
Section 6.2
1. Discuss high activity catalysts for the manufacturing of isotactic polypropylene, heterogeneous
and homogeneous.
2. What are the current techniques for polypropylene manufacture?
3. How can syndiotactic polypropylene be prepared and what are its properties?
Section 6.3
1. Describe the two industrial processes for manufacturing polybutylene.
Section 6.4
1. Draw the chemical structure of isotactic poly(butene-1). How is it prepared and used?
2. What is TPX, how is it prepared, and what are its properties?
Section 6.5
1. Discuss copolymers of ethylene with propylene. How are they prepared? What catalysts are used
in the preparations? How are ethylene-propylene rubbers cross-linked?
2. What are the copolymers of ethylene with higher
-olefins and why are they prepared and how?
3. Discuss the copolymers of ethylene with vinyl acetate? How are they prepared and used?
4. What are ionomers? Describe each type. How are they used?
5. Describe the catalysts used in preparations of aliphatic ketones by copolymerization of ethylene
with carbon monoxide.
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