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  • oxetane  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Studies on the polymerization mechanism of 3-nitratomethyl-3′-methyloxetane and 3-azidomethyl-3′-methyloxetane and the synthesis of their respective triblock copolymers with tetrahydrofuran (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 1607-1613 
    Details
    ISSN: 0887-624X
    Keywords: living cationic polymerization ; oxetane ; triflic anhydride ; tetrahydrofuran ; block copolymer ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Novel energetic oxetane derivatives, 3-nitratomethyl-3′-methyloxetane (NMMO) and 3-azidomethyl-3′-methyloxetane (AMMO), were used as monomers in a triflic anhydride [(CF3SO2)2O] initiating polymerization system. The “living cationic” characteristics of the polymerization were investigated and confirmed via a 19F NMR technique. This living polymerization system was, thus, utilized in the synthesis of well-defined block copolymers. Novel polymers of the A - B - A -  type with various molecular weights (M̄w = 14320-40660) and low polydispersity indexes (PDI = 1.11-1.29) were obtained. Two glass transition temperatures (Tg) near the respective Tgs of the homopolymers were found in the DSC thermograms of the block copolymers. The THF/AMMO copolymers were shown to possess higher thermal stability compared to THF/NMMO copolymers from thermogravimetric analysis (TGA). © 1995 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080331007
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  • 2
    Electronic Resource
    Electronic Resource
    Tetrahydrofuran and 3,3-bis(chloromethyl) oxetane triblock copolymers synthesized by two-end living cationic polymerization (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 3371-3375 
    Details
    ISSN: 0887-624X
    Keywords: block copolymer ; tetrahydrofuran ; oxetane ; ring opening ; cationic polymerization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Triblock copolymers based on tetrahydrofuran (THF) and 3,3-bis(chloromethyl) oxetane (BCMO), BCMO-block-THF-block-BCMO and poly(BCMO-co-THF)-THF-(BCMO-co-THF), have been synthesized by two-end living cationic polymerization with a bifunctional initiator, trifluoromethanesulfonic anhydride [(CF3SO2)2O]. The polymers are obtained by using the two end propagating species of poly(THF) to initiate the sequential BCMO polymerization. The resulting polymers are characterized by infrared (IR), nuclear magnetic resonance (NMR), and differential scanning calorimetry (DSC), confirming that the polymers are ABA-type block copolymers. The identities of the molecular weights predetermined and which determined by GPC show the success of predetermining molecular weights of the polymers and preparing well-defined polymers. The narrow polydispersities, 1.1-1.3, indicate that the chains are propagating by a living mechanism. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080311325
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  • 3
    Electronic Resource
    Electronic Resource
    New addition reaction of polymers carrying pendent oxetane rings: Synthesis of a nonlinear optical polymer (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 3201-3204 
    Details
    ISSN: 0887-624X
    Keywords: addition reaction ; oxetane ; triflic acid ; nonlinear optical ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080321623
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  • 4
    Electronic Resource
    Electronic Resource
    Cationic ring-opening polymerization of oxetane derivatives initiated by superacids: Studies on their propagating mechanism and species by means of 19F-NMR (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 2543-2549 
    Details
    ISSN: 0887-624X
    Keywords: oxetane ; 19F-NKR ; triflic ; ring opening ; cationic polymerization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The nature of ring-opening polymerization of oxetane derivatives initiated by triflic acid and triflic anhydride was investigated via 19F-NMR spectroscopy. Two types of propagating species, which were directly observed from the 19F-NMR spectra, were found to be oxonium macroions and triflic macroesters. These two propagating species established and equilibrium relationship during the polymerization process. The forming of oxonium macroion active species was highly dependent upon the substituents of the oxetane ring, and were enhanced when a more polar solvent was employed. The initiator effect, which occurred primarily in the initiating stage of the polymerization, is also discussed. © 1994 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080321317
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