Abstract
SYNOPSIS We have analyzed fractionated samples of poly(methacry1ic acid) produced in a propagating front for the amount of anhydride that formed and determined that a large percentage of acid groups exist as anhydrides (>20%). By analyzing the samples after cleavage, we found that the molecular weight dropped significantly (from M,, = 1.4 X lo5 to M, = 1.0 X lo4). We conclude that the high molecular weights observed previously were the result of intermolecular anhydride formation. Poly(buty1 acrylate), which cannot form anhydride bonds, produced in fronts had broad (MJM, = 1.7-2.0) but unimodal molecular weight distributions with M, < lo5. The average molecular weight decreased with increasing initiator concentrations. 0 1996 John Wiley & Sons, Inc.
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