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  • 1980-1984  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Head to head polymers (1983)
    Springer
    Polymer bulletin 9 (1983), S. 236-240 
    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: Abstract Blends of head to head polyisobutylene and amorphous head to tail polyisobutylene were prepared by casting films of the polymer mixtures from o-dichlorobenzene. The glass transition behavior of the polymer blends was studied by DSC analysis. Two glass transition temperatures were observed over almost the entire composition range which indicates that the two structurally similar head to tail and head to head polyisobutylenes are not miscible even in the molecular weight range of 3000 to 5000.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283713
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Copolymerization of 3,4-dimethyltetrahydrofuran with cyclic ethers (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 2033-2041 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The copolymerization of 3,4-dimethyltetrahydrofuran with selected cyclic ethers was studied. Although 3,4-dimethyltetrahydrofuran did not homopolymerize, it readily copolymerized with propylene oxide and epichlorohydrin in an alternating fashion using the cationic initiator PF5. The reactivity ratios r1 and r2 for the copolymerization of 3, 4-dimethyltetrahydrofuran and epichlorohydrin were r1 = 0.22 ± 0.05 and r2 = 0.11 ± 0.01, respectively.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.170200806
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Head to head polymers. XXIX. A new synthetic route to poly(1,1-dimethylpropane)Part XXVIII: M. Malanga and O. Vogl: J. Macromol. Sci. - Chem:, in press (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 446-451 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(1,1-dimethylpropan) wurde mittels der Wurtzschen Reaktion synthetisiert. Das erhaltene Polymer hat nur mäßige relative Molekülmasse, ist zu etwa 50% kristallin und hat eine Schmelztemperatur von 87°C sowie eine Glasübergangstemperatur von -17°C. Das Polymer ist im wesentlichen das gleiche Material, das durch kationische Hydrid-transfer-Polymerisation von 3-Methyl-buten-1 bei niedrigen Temperaturen oder durch kationische Ringöffnungs-polymerisation von 1,1-Dimethylcyclopropan erhalten wird. Poly(1,1-dimethylpropan) wurde nach der Wurtzschen Synthese nur in niedriger Ausbeute erhalten; ein wesentlicher Teil des Reaktionsproduktes war 1,1-Dimethylcyclopropan.
    Notes: Poly(1,1-dimethylpropane) was synthesized by Wurtz coupling polymerization. The polymer was of moderate molecular weight, about 50% crystalline, had a melting temperature of 87°C and a glass transition temperature of -17°C. The polymer was essentially the same material as that obtained by cationic hydride transfer polymerization of 3-methylbutene-1 at very low temperatures, or by cationic ring opening polymerization of 1,1-dimethylcyclopropane. Poly(1,1-dimethylpropane) obtained by the Wurtz reaction was obtained in only low yield; a substantial part of the total reaction product was 1,1-dimethylcyclopropane.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010350603
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  • 4
    Electronic Resource
    Electronic Resource
    Head-to-head polymers 27: Thermal degradation of head-to-head polyisobutylene (1983)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 23 (1983), S. 226-229 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Head-to-head polyisobutylene degrades at a maximum rate at 320°C, a temperature about 65°C lower than head-to-tail polyisobutylene. Under our conditions, head-to-tail (the regular polyisobutylene) degrades (as do many other disubstituted vinyl monomers) to a high yield of the monomer isobutylene. Surprisingly, head-to-head polyisobutylene also degraded, primarily to isobutylene. Liquid, low-molecular compounds, probably dimers, were also obtained from head-to-tail and head-to-head polyisobutylene. A mechanism of this degradation is proposed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760230412
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