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  • 1
    Electronic Resource
    Electronic Resource
    GPC calibration for poly(methyl acrylate) (1981)
    Springer
    Polymer bulletin 5 (1981), S. 429-435 
    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 The methods of GPC calibration proposed by WEISS and COHN Ginsberg (1969) and by MAHABADI and O'DRISCOLL (1977) has been applied. Their restriction and a possibility to overcome it has been demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255979
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  • 2
    Electronic Resource
    Electronic Resource
    Cationic reactions in the melt (1981)
    Springer
    Polymer bulletin 5 (1981), S. 469-476 
    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 The effect of Lewis acids of different acidities, i.e., AlCl3 and Bu2SnCl2, on polystyrene melt has been investigated using the mixing chamber of a Brabender Plastograph at 180°C. The torque was monitored as a function of time and molecular weights of periodically withdrawn samples were determined. The structure of select samples has-been analyzed by 1H-NMR spectroscopy. A sequence of complex physical and chemical transformations has been identified. The addition of Lewis acids to polystyrene melts causes an immediate drastic decrease in the torque due to rapid partial polymer degradation which is followed by homogenization and a slower degradation phase. There is evidence for the formation and accumulation of unsaturation during degradation. Cationic reactions induced by the Lewis acids readily explain the observed sequence of chemical transformations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255985
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization and degradation pf poly(vinyl chloride-g-isobutylene) carrying tertiary chlorine and cyclopentadienyl branch termini (1982)
    Springer
    Polymer bulletin 6 (1982), S. 661-661 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255170
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  • 4
    Electronic Resource
    Electronic Resource
    Cyclopentadienylation of allyl-chlorine enriched PVC and degradation thereof (1981)
    Springer
    Polymer bulletin 6 (1981), S. 147-153 
    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 Pendant cyclopentadienyl groups (Cp) have been introduced by treatment with Me2CpAl into poly(vinyl chlorides) the allyl chlorine contents of which was augmented by mild chemical dehydrochlorination [PVC(A)]. Heating the cyclopentadienylated products [PVC(A)-Cp] led to gels, most likely by Diels-Alder addition, because the networks could be broken by strong dieno-philes, e.g., maleic anhydride. The thermal stability of PVC(A)'s was improved upon Me2CpAl treatment due to the substitution of thermally unstable allylic chlorines by Cp groups. The thermooxidative stability of PVC(A)-Cp was reduced relative to that of PVC(A) on account of the high oxidizability of Cp groups in the resin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00956281
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization and degradation of poly(vinyl chloride-g-lsobutylene) carrying tertiary chlorine and cyclopentadienyl branch termini (1981)
    Springer
    Polymer bulletin 6 (1981), S. 155-162 
    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 Poly(vinyl chloride-g-isobutylene)s have been synthetized by using PVC backbones containing relatively high concentration of allylic chlorines [PVC(A)] in conjunction with BCl3 coinitiator. Since graft-termination occurs by ion-collapse, graft copolymers with tertiary chlorine branch termini [PVC(A)-g-PIB-Cl] were formed. The presence of terminal tertiary chlorines has been demonstrated by degradation and cyclopentadienylation experiments. UV-visible spectra of ungrafted and grafted PVC(A) , molecular weight data, and branching frequency as a function of concentration of allylic chlorines indicate chain transfer to polyenes. Thermal and thermooxidative stability of PVC(A) increases upon grafting due to the replacement of allylic chlorines by PIB branches. The introduction of highly oxidizable Cp groups in PVC(A)-g-PIB-Cl by Me2CpAl-treatment decreases the thermooxidative stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00956282
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  • 6
    Electronic Resource
    Electronic Resource
    Cationic reactions in the melt (1982)
    Springer
    Polymer bulletin 6 (1982), S. 327-333 
    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 The effect of Lewis acids on various ethylene-propylene co- and terpolymers has been investigated in the mixing chamber of a Brabender Plastograph at 180°C. Fast degradation of the polymers was observed upon the addition of Lewis acids. Terpolymers containing unsaturations undergo crosslinking: the structure of the third monomer (diene) determines the rate of crosslinking and the characteristics of the crosslinked materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255406
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  • 7
    Electronic Resource
    Electronic Resource
    Thermo-oxidative degradation of polyolefines (1982)
    Springer
    Polymer bulletin 7 (1982), S. 489-495 
    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 Autooxidation of low density polyethylene has been studied in melt and in 1,2,4-trichlorobenzene solution. The kinetics of oxygen-absorption, concentrations of hydroperoxides, carboxyl, and other oxo groups and average number of scissions have been investigated. It has been found that the main features of the oxidative processes in solution and in melt do not differ significantly. However, the concentration of hydroperoxides as a function of conversion and the dependence of the maximum concentration of hydroperoxides on temperature make exception. There is a very good agreement between average number of chain scissions and carboxyl groups and this is independent of phase, concentration, temperature, and conversion. From one mole consumed oxygen approximately 0.6 ÷ 0.7 mole remains in the polymer backbone in the form of oxygen-containing functional groups. The ratio of average chain scissions to the formed carbonyl groups is 1∶5, i.e., functional groups form both at the chain ends, in consecutive reactions after the scission, and along the polymer chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00254375
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  • 8
    Electronic Resource
    Electronic Resource
    Kinetic evaluation of polyethylene autoxidation in melt (1983)
    Springer
    Polymer bulletin 10 (1983), S. 559-565 
    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 This work proposes a description of the kinetics of polyethylene autoxidation in melt. The model takes into consideration the effect of neighbouring groups on the hydroperoxide decomposition. Using the proposed model, reliable constants can be calculated for the autoxidation of polyethylene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285376
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of labile chlorine content in polychloroprene, chlorobutyl rubber and chlorinated ethylene-propylene copolymer by thermal dehydrochlorination combined with Me3 Al treatment (1980)
    Springer
    Polymer bulletin 2 (1980), S. 461-467 
    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 The labile (allylic and/or tertiary) chlorine content of polychloroprene, chlorobutyl rubber, and chlorinated ethylene propylene copolymer has been determined by thermal dehydrochlurination combined with Me3Al treatment. The difference between the extent of dehydrochlorination of virgin and Me3 Al-treated polymers yielded the labile Cl content of these rubbers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00254885
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  • 10
    Electronic Resource
    Electronic Resource
    GPC study of ethylene-propylene copolymers combined with viscometry and IR spectroscopy (1982)
    Springer
    Polymer bulletin 8 (1982), S. 311-317 
    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 By combining GPC fractionation with IR spectroscopy of ethylene-propylene copolymer (EP) samples, it has been shown that copolymer composition of EP's used in this study does not dep-end on molecular weight. Thus, contrary to earlier investigations by others, molecular weight distributions (MWD) and averages of EP's have been determined by using only experimental data such as GPC traces, universal calibration curve of GPC, and intrinsic viscosities. A comparative study has been carried out by using the MV method (called median value method) and the method of Ogawa and Inaba (OI method) for determination of MWD's and molecular weight averages of EP's. Application of the MV method results in lower molecular weight averages than the use of the equations proposed by Ogawa and Inaba for calculation of Mark-Houwing constants of EP's. However, polydispersities were found to be the same in both methods. The MV method also yields composition depending reliable pairs of Mark-Houwink constants, a and K, for EP's in 1,2,4-trichloro-benzene at 135 °C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264919
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