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  • 1
    Electronic Resource
    Electronic Resource
    Kinetic treatment for the photodimerization reaction of modified natural polyisoprenes (1991)
    Springer
    Polymer bulletin 26 (1991), S. 637-641 
    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 Natural polyisoprenes modified by the introduction of cinnamoyl groups have been obtained as films. In these polymers, aliphatic-(CH2)n- spacers of different lengths separate the main chain from the photosensitive group. Density measurements have been carried out, and the kinetic treatment of the photodimerization reaction is described. The relation between Tg and kobs to the size of the aliphatic spacer suggests that, at least for n=2 to 6, other factors may be affecting the reactivity of the cinnamoyl group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313218
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  • 2
    Electronic Resource
    Electronic Resource
    Photosensitivity of modified natural polyisoprenes as function of the alipathic side chain (1991)
    Springer
    Polymer bulletin 25 (1991), S. 217-223 
    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 Modified natural rubber products were prepared by reaction with maleic anhydride followed by ring opening and condensation with different oxyalkylcinnamate esters. The values of Tg obtained for these photocrosslinkable polymers showed a complex relation to the number of C atoms of the aliphatic moiety. The kinetics of the dimerization reaction for thin films was followed by UV spectrometry. The film thickness plays an important role on conversion up to a threshold value, characteristic of each product. The expected relation between Tg and kobs was observed for products when Tg values were markedly different.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310795
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Kinetic behavior of UV-sensitive polymers from modified natural rubber (1993)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 4 (1993), S. 490-495 
    Details
    ISSN: 1042-7147
    Keywords: Cinnamoylated rubbers ; Photocrosslinking reactions ; Correlation of dimerization rate constants ; Glass transition temperatures ; Aliphatic spacers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Photosensitive copolymers have been obtained by chemical modification of natural rubber. The introduction of the photoreactive cinnamoyl group in different conversions has been carried out by the reaction of natural polyisoprene with maleic anhydride, followed by ring opening and condensation with some oxyalkylcinnamate esters. These reactions gave rise to five polymer series. Each series, for which the anhydride content was kept constant, is constituted of five copolymeric products, differing from each other in the size of the aliphatic chain between the chromophore and the main chain. The photosensitive products were submitted to UV irradiation, and their kinetic behavior has been investigated in order to correlate structural dissimilarities with the dimerization rate constants.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1993.220040802
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  • 4
    Electronic Resource
    Electronic Resource
    Application of photosensitive surfactant based on natural rubber in emulsion polymerizations (1996)
    Springer
    Polymer bulletin 36 (1996), S. 197-202 
    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 Photosensitive surfactant was prepared by incorporation of maleic anhydride to natural rubber, followed by introduction of cinnamate groups and neutralization of the remaining carboxylic groups. The surfactant was used in emulsion polymerization of styrene and acrylic monomers, giving rise to stable reactive emulsion. Coated onto HDPE, this emulsion lead to solid films which were submitted to UV irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294906
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  • 5
    Electronic Resource
    Electronic Resource
    Properties of poly(methyl methacrylate-g-propylene oxide) in solution (1991)
    Springer
    Polymer bulletin 26 (1991), S. 657-664 
    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 Graft copolymers of poly(methyl methacrylate) backbone and uniform poly(propylene oxide) branches were synthesized by the macromonomer technique and characterized by VPO, GPC and 1H-NMR. Viscometric investigations of unfractionated samples were carried out at 25°C in chloroform and toluene (non-selective solvents) and in carbon tetrachloride (a selective solvent for the branches). The coefficients of the Huggins, Kraemer, Martin and Schulz-Blaschke equations were calculated. According to the values obtained for the Huggins coefficient, kh, the best solvent for the copolymer seems to be chloroform. The positive values of the Kraemer coefficient, kk, determined in carbon tetrachloride, suggest that the copolymer assumes a star-like conformation in this solvent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313221
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    Paper (German National Licenses)
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