Manipulation of the molecular weight and branching structure of hyperbranched poly(arylene ether phosphine oxide)s prepared via an A 2 + B 3 approach
2003; Wiley; Volume: 41; Issue: 24 Linguagem: Inglês
10.1002/pola.10975
ISSN1099-0518
Autores Tópico(s)Synthetic Organic Chemistry Methods
ResumoAbstract A series of hyperbranched poly(arylene ether phosphine oxide)s (HB PAEPOs) were prepared via an A 2 + B 3 polymerization scheme with tris(4‐fluorophenyl)phosphine oxide as B 3 , and a variety of bisphenols as A 2 . The effects of the reactivity of the A 2 monomer, the A:B ratio, the addition mode, the solvent, and the concentration on the final molecular weight, polydispersity index (PDI), and degree of branching (DB) were studied. Soluble HB PAEPOs with weight‐average molecular weights of up to 299,000 Da were achieved. Reactions in which the A 2 component was added slowly resulted in lower DBs (0.2–0.5), whereas the slow addition of the B 3 component provided samples with DBs of approximately 0.75. Reactions performed under high‐dilution conditions afforded completely soluble materials with weight‐average molecular weights of 9000–12,100 Da and PDI values as low as 2.20. The molecular weights achieved under high‐dilution conditions were independent of the mode of monomer addition. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 3871–3881, 2003
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