Chemistry Reference
In-Depth Information
Section 5.4
1. Describe the initiation process in polymerizations of oxetanes, including initiators and reaction
mechanism
2. Describe the mechanism of propagation in polymerizations of oxetanes.
Section 5.5
1. Discuss, including chemical equations, the initiation reactions in tetrahydrofuran polymerization,
including the mechanism and various initiators
2. Discuss the propagation reaction in polymerization of tetrahydrofuran.
3. When are both ionic and covalent species present during the polymerization of tetrahydrofuran.
Explain conditions that cause formation of both species and draw structures of both.
4. Describe
the
termination reaction in tetrahydrofuran polymerization,
including living
polymerization.
Section 5.6
1. How do the rates of oxepane polymerization compare with those of oxetane and tetrahydrofuran?
What affects these rates.
Section 5.7
1. How and why do the cationic polymerizations of cyclic acetals differ from those of other cyclic
ethers?
2. What initiators are effective in polymerizations of trioxane? Discuss polymerizations with differ-
ent initiators.
3. Describe typical polymerization conditions of trioxane.
4. Explain the proposed reaction mechanisms for polymerization of trioxane including the coordi-
nated mechanism in polymerizations with molybdenum acetylacetonate. Illustrate all with chemi-
cal structures.
5. Discuss the polymerization of dioxalane, showing mechanism of initiation, propagation, and
terminations with different initiators.
6. How does a polymer and a copolymer form side by side in boron trifluoride initiated
polymerizations of dioxepane?
7. What type of structures are obtained from ring-opening polymerizations of trioxocane? Show and
explain.
Section 5.8
1. Describe cationic polymerization of lactones, showing the initiation and propagation processes.
2. Repeat question one for anionic polymerization.
