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  • 1
    Electronic Resource
    Electronic Resource
    Polyurethane-polymethacrylic acid multi-block copolymers and their anionomers through “living” radical mechanism (1996)
    Springer
    Polymer bulletin 37 (1996), S. 711-717 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polyurethane-polymethacrylic acid multi-block copolymers were synthesized from tetraphenylethane based polyurethane iniferter. Number of polymethacrylic acid blocks and molecular weight of block copolymers increased with increasing polymerization time which proves that the formation of block copolymers is through a “living” radical mechanism. The multi-block copolymers obtained were converted into their sodium anionomers. The multi-block copolymers and their anionomers have been characterized by FTIR, FTNMR and DSC analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295767
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polyurethane-polymethacrylic acid multiblock copolymer dispersions through polyurethane macroiniferters (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 285-290 
    Details
    ISSN: 1435-1536
    Keywords: Key words Polyurethane dispersions ; Macroiniferters ; Iniferters ; Living radical polymerization ; Multiblock copolymers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polyurethane-polymethacrylic acid multiblock copolymers have been prepared from tetraphenylethane-based polyurethane macroiniferters. Aqueous dispersions of these block copolymers and their anionomers have been prepared. Anionomeric dispersions have smaller particle size and higher viscosity when compared to their corresponding block copolymeric dispersions. Particle size decreases whereas viscosity increases when the degree of neutralization is increased. Tensile strength and initial modulus are higher for films derived from anionomeric dispersions than for the corresponding block copolymeric films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013758
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Tetraphenylethane iniferters. II. Toluene diisocyanate-based polyurethane iniferter for “living” radical polymerization of acrylonitrile (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 1723-1731 
    Details
    ISSN: 0887-624X
    Keywords: “living” radical polymerization ; iniferter ; macroiniferter ; polyurethane ; 1,1,2,2-tetraphenylethane-1,2-diol ; acrylonitrile ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel polyurethane iniferter, synthesized from equal moles of toluene diisocyanate and 1,1,2,2-tetraphenyl-1,2-ethanediol, was used to polymerize acrylonitrile to assess whether it proceeded via a “living” radical polymerization mechanism. From the kinetic results, the rate of polymerization could be expressed as Rpα[BPT]0.96[AN]1.64. The increase of number-average molecular weight with increase of both conversion and polymerization time, the bimodal molecular weight distribution in gel permeation chromatography and the increase of molecular weight in the post-polymerization of polyacrylonitrile confirm that the present tetraphenylethane-based polyurethane iniferter follows a “living” radical polymerization mechanism. © 1996 John Wiley & Sons, Inc.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of polyurethane-polyvinylbenzyl chloride multiblock copolymers and their cationomers using a polyurethane macroiniferter (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 1237-1244 
    Details
    ISSN: 0887-624X
    Keywords: polyurethane ionomers ; iniferters ; “living” radical polymerization ; tetraphenylethane derivatives ; vinylbenzyl chloride ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyurethane iniferter prepared from isocyanate end capped prepolymer and 1,1,2,2-tetraphenyl-1,2-ethanediol, has been used to polymerize vinylbenzyl chloride to obtain polyurethane-polyvinylbenzyl chloride multiblock copolymers. Formation of the block copolymers proceeds with increase in both molecular weight and conversion with increasing polymerization time showing that the polymerization proceeds via a “living” radical mechanism. The block copolymers so obtained were converted into their cationomers by the treatment of triethylamine. The block copolymers and their cationomers have been characterized by FTIR, FTNMR, TGA, and DSC studies. The effect of thermal energy on the molecular weight of the macroiniferter in the absence of monomer has been studied in order to understand the mechanism of formation of the block copolymers. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 1237-1244, 1997
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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