Which ONE of the following will NOT initiate a cationic polymerization? a.) BF3

Question

Which ONE of the following will NOT initiate a cationic polymerization? a.) BF3 b.) H_2SO_4 c.) H_3PO_4 d.) HBr e.) AICI_3 Which of the following monomers WILL undergo anionic polymerization? a.) I b.) II c.) Ill d.) I and II e.) II and III Which one of the following statements describing reversible deactivation radical polymerization (controlled/"living" radical polymerization) is FALSE? a.) Polymerizations are controlled by use of a dormant state to slow down and limit termination events. b.) Atom transfer radical polymerization utilizes a reversible redox process. c.) Reversible Addition Fragmentation Chain Transfer polymerizations can have only one polymer chain attached to the dormant state. d.) Nitroxide mediated radical polymerizations using TEMPO is effective for styryl monomers. e.) All are true.

Explanation / Answer

Ans2. HBr doesnot promote cationic polymerization because on removal of H+ ions it also gives Br- which cause interferance in cationic polymerization.

Ans 3. II and III both can undergo anionic polymerization in the presence of strong base but propene cannot go anionic polymerization, it polymerized generally free radical mechanism.

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