| 초록 |
Rapid polymerization of acrylamide monomers using triisobutyl aluminum (TIBA) as an initiator results in high molecular weight (Mn=100,000) and narrow molecular weight distribution (Mw/Mn=1.1). Although the propagation is fast enough to consume all monomers within a few minutes, only a little portion of initiators is activated during the polymerization. Despite the low initiation rate, the polymerization showed linear relation between the molecular weight and the amount of TIBA, The polymerization proceeded by slow initiation and fast propagation has been a serious obstacle to investigate its mechanism. However, it is possible to obtain the intermediate successfully under condition of high initiator concentration and low monomer concentration, and the structure of the intermediate indicates that the polymerization of acrylamides is initiated by 1,4-addition by alkyl transfer, and propagated by aluminum-oxygen bond interchange. The increase of molecular weight was observed with addition of additional monomer. Details of polymerization and its mechanism will be presented.
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