ISSN:
0887-624X
Schlagwort(e):
propagating polymerization fronts
;
frontal polymerization
;
traveling waves
;
anhydride
;
methacrylic acid
;
butyl acrylate
;
molecular weight distributions
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
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 Mu 〈 105. The average molecular weight decreased with increasing initiator concentrations. © 1996 John Wiley & Sons, Inc.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
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