J . Am. Chem. Soc. 1990, 112, 9657-9659 ventional addition polymerization process is not involved; rather, the polymer is formed through a stepgrowth mechanism involving the terminal vinyl groups. Consistent with this mechanism was the observation of an exponential increase in molecular weight with time (highest observed MW = 6000). For a given reaction time, the molecular weight of the poly(DVB) obtained increased markedly with both increasing temperature and increasing catalyst concentration. Thus, it was possible to control the molecular weight of poly(DVB) by an appropriate choice of reaction conditions. Our procedure for the linear polymerization of DVB appears to be superior to that described earlier in that the use of lower temperatures (
