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The true molecular weight distributions of acrylate polymers formed in propagating fronts

✍ Scribed by John A. Pojman; Jason R. Willis; Akhtar M. Khan; William W. West

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
437 KB
Volume
34
Category
Article
ISSN
0887-624X

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✦ 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 ( M J M , = 1.7-2.0) but unimodal molecular weight distributions with M , < lo5. The average molecular weight decreased with increasing initiator concentrations.

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