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  • 1965-1969  (4)
  • Polymer and Materials Science  (4)
  • Chemistry  (3)
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  • Polymer and Materials Science  (4)
  • Chemistry  (3)
  • Physics  (1)
  • 1
    Digitale Medien
    Digitale Medien
    The effect of monomer concentration on the rate of anionic polymerization of styrene in tetrahydrofuran (1967)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 108 (1967), S. 288-291 
    Details
    ISSN: 0025-116X
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1967.021080125
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  • 2
    Digitale Medien
    Digitale Medien
    The absolute rate constant of propagation of the free living polystyrene ion, and the dissociation constant of the ∼∼S-, NA+ ion pair (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 3 (1965), S. 1037-1041 
    Details
    ISSN: 0449-2986
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1965.110031212
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  • 3
    Digitale Medien
    Digitale Medien
    Anionic polymerization of vinylmesitylene (1965)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 3 (1965), S. 3099-3106 
    Details
    ISSN: 0449-2951
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Anionic polymerization of vinylmesitylene was investigated in THF (counterion Na+) at temperatures ranging from +25° to -70°C. The homopropagation is slow (kp ∼ 11./mole-sec. at 25°C.), indicating the basically low reactivity of the monomer. Studies of conductivity and the retardation of the polymerization by the addition of Na+BPh4- demonstrate that free ions and ion pairs participate in the process. At 25°C. the kp of the free ion appears to be about 1000 times greater than that of ion pair. The outstanding feature of the polymerization is the proton transfer from the monomer to living end, producing an inert ion (or its isomer) which does not propagate. This reaction leads to retardation of the polymerization. Its contribution decreases on lowering the temperature, and the effect of Na+BPh4- indicates that the free ion, and not the ion-pair, acts as a base in the proton transfer.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1965.100030905
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  • 4
    Digitale Medien
    Digitale Medien
    Anionic copolymerization of styrene and 1,1-diphenylethylene (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 2219-2228 
    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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