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Anionic copolymerization of styrene and 1,1-diphenylethylene (1966)

Ureta, E. ; Smid, J. ; Szwarc, M.

New York : Wiley-Blackwell

Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 2219-2228

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Details

ISSN: 0449-296X

Schlagwort(e): Physics ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Kinetics of anionic copolymerization of styrene (S) and 1,1-diphenylethylene (D) were investigated in THF. The rate constant of addition of D to living polystyrene was found to be k1,2 ± = 250 l./mole-sec. for , Na+ ion-pair, and that for the free , Na+ ion is k1,2-∼400,000 l./mole-sec. Both values refer to 25°C. The addition of styrene to —D-, Na+ was found to be reversible: and k2,1 was determined by three different methods to be ∼0.5-0.7 l./mole-sec. Studies performed in a stirred-flow reactor led to k-21 = 13 sec. -1 and K21 ∼ 5 × 10-2 l./mole. An alternating copolymer is obtained in the presence of a large excess of 1,1-diphenylethylene.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pol.1966.150040916

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