The true molecular weight distributions of acrylate polymers formed in propagating fronts
We have analyzed fractionated samples of poly(methacrylic 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 Mn = 1.4 × 105 to Mn = 1.0 × 104). We conclude that the high molecular weights observed previously were the result of intermolecular anhydride formation. Poly(butyl acrylate), which cannot form anhydride bonds, produced in fronts had broad (Mw/Mn = 1.7-2.0) but unimodal molecular weight distributions with Mw < 105. The average molecular weight decreased with increasing initiator concentrations. © 1996 John Wiley & Sons, Inc.
Publication Source (Journal or Book title)
Journal of Polymer Science, Part A: Polymer Chemistry
Pojman, J., Willis, J., Khan, A., & West, W. (1996). The true molecular weight distributions of acrylate polymers formed in propagating fronts. Journal of Polymer Science, Part A: Polymer Chemistry, 34 (6), 991-995. https://doi.org/10.1002/(SICI)1099-0518(19960430)34:6<991::AID-POLA8>3.0.CO;2-L