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  • 1
    Electronic Resource
    Electronic Resource
    The Effect of Cumyl Hydroperoxide on the Behavior of Oxidation Inhibitors (1961)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 83 (1961), S. 1217-1219 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01466a045
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  • 2
    Electronic Resource
    Electronic Resource
    Binding of mercury(II) to poly(dA-dT) studied by proton NMR (1982)
    s.l. : American Chemical Society
    Biochemistry 21 (1982), S. 62-66 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00530a012
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation of λdg Deoxyribonucleic Acid Halves by Hg(II) Binding and Cs2SO4 Density-Gradient Centrifugation* (1965)
    s.l. : American Chemical Society
    Biochemistry 4 (1965), S. 1697-1702 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00885a002
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  • 4
    Electronic Resource
    Electronic Resource
    Separation of Deoxyribonucleic Acids by Hg(II) Binding and Cs2SO4 Density-Gradient Centrifugation* (1965)
    s.l. : American Chemical Society
    Biochemistry 4 (1965), S. 1687-1696 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00885a001
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  • 5
    Electronic Resource
    Electronic Resource
    Chain Transfer in Mixed Solvent Systems (1960)
    [s.l.] : Nature Publishing Group
    Nature 185 (1960), S. 235-236 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The general equation for the reciprocal average degree of polymerization in the catalysed system can be easily derived4 as: IIP = CM + CS(S)I(M) + CZ(I)/(M) -f ...(A*I(M)*)...RP (I) where P is the number average degree of polymerization, CM, C's and C are the chain-transfer constants ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/185235a0
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of mercuric ion on the DNA-methylene blue complex (1971)
    New York : Wiley-Blackwell
    Biopolymers 10 (1971), S. 2625-2628 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360101224
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  • 7
    Electronic Resource
    Electronic Resource
    Studies in addition polymerization in mixed solvent system part V. Chain transfer of short chain aliphatic alcohols in the polymerization of methyl methacrylate and styrene (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 149 (1971), S. 231-241 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurden Polymerisation in Gegenwart von Alkoholen und Benzol als Polymerlösungsmittel (mixed-solvent system) untersucht. Die Kettenübertragungsfähigkeit aliphatischer Alkohole nimmt mit der Größe der Alkylkette in folgender Ordnung zu: Methylalkohol 〈 Äthylalkohol 〈 n-Propylalkohol 〈 Isopropanol. Nach den Ergebnissen ist eine Ablösung von α-Wasserstoff aus dem Substrat übertragend wirksam. Die durch die übliche Auftragung von 1/P̄ gegen [S]/[M] erhaltenen Kettenübertragungskonstanten stimmen gut mit Werten überein, die aus den mittels der Farbverteilungstechnik gemesse nen Hydroxylendgruppengehalten berechnet wurden. Die steigenden Werte der übertragungskonstante mit wachsender Zahl der Kohlenstoffatome im Alkohol wird durch die Wahrscheinlichkeit zugänglicher Wasserstoffatome in der Alkylgruppe erklärt. Die Kettenübertragungswerte werden durch die Fällung der Polymeren beeinflußt. Es wurden aus den Kettenübertragungswerten der Alkohole für verschiedene Temperaturen thermodynamische Parameter berechnet.
    Notes: Studies on Polymerization in the presence of alcohols has been carried out using mixed solvent system. It is observed that chain transferring capacity of the aliphatic alcohols do increase with the size of the alkyl group, the order being methyl alcohol 〈 ethyl alcohol 〈 n-propyl alcohol 〈 iso-propyl alcohol. The results indicate that α-hydrogen abstraction from the substrate is effective. The chain transfer constants obtained from the conventional plot of 1/P̄ against S/M is in fair agreement with the values computed from the estimation of hydroxyl end group in the polymer by dye-partition technique. The increasing transfer constant values in the alochol series with increase in the number of carbon atoms is explained on the basis of probability of available hydrogen atom in the alkyl group. It is also observed that the chain transfer values are affected due to precipitation of polymer. Thermodynamic parameters have been computed from the chain transfer values of alcohols at different temperatures.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021490118
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  • 8
    Electronic Resource
    Electronic Resource
    Studies in addition polymerization in mixed solvent system part VI. Chain transfer of aromatic amines in the polymerization of methyl methacrylate (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 149 (1971), S. 243-251 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Kettenübertragungskonstanten von aromatischen Aminen bei der Polymerisation von Methacrylsäuremethylester mit Benzol als Verdünnungsmittel (mixed-solvent method) wurden bestimmt. Die Übertragungskonstanten nehmen in folgender Reihe ab: Anilin 〈 N-Methylanilin 〈 N-Dimethylanilin. Die Kettenübertragungsfähigkeit der Amine wird auf Grund einer polaren Struktur im Übergangszustand erklärt. Eine Substitution, welche die Elektronenabgabe des Amino-Stickstoffs fördert, gibt eine größere Übertragungsfähigkeit. Die durch die Amine bedingte Abnahme der Polymerisationsgeschwindigkeit ist von der gleichen Ordnung wie jene der Kettenübertragungsfähigkeit und wird auf Grund einer Hyperkonjugation erklärt. Die Bestimmung der Aminoendgruppen im Polymeren mittels der Farbverteilungstechnik stützt den für die Übertragungsreaktion der Amine angenommenen Mechanismus.
    Notes: Chain transfer constants of amines have been determined in the polymerization of methyl methacrylate using the mixed-solvent method. The transfer constants are in the order of aniline 〈 methyl aniline 〈 dimethyl aniline. The chain transferring ability of amines has been explained in the light of the polar structure of the transition state. Substitution enhancing electron donating capacity of the amine nitrogen results in higher transferring ability. The decrease in the rate of polymerization due to amines, is in the same order as that of chain transferring capacity and is explained on the basis of hyperconjugation. The estimation of amino end group in the polymer by dye-partition technique supports the mechanism suggested for transfer reaction of amines.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021490119
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of chain transfer of alcohols by end group estimation (1968)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 116 (1968), S. 8-13 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Chain transfers of methyl alcohol, ethyl alcohol, n-propyl alcohol, and isopropyl alcohol in methyl methacrylate polymerization at 100°C have been evaluated from estimation of hydroxyl end group in the polymer. The results agree fairly well with the values obtained by the conventional method. The mechanism of the transfer reaction has also been discussed in the light of the results obtained from end group determination and it is inferred that the transfer reaction takes place mainly by the rupture of C—H bond.Das Ausmaß der Kettenübertragung durch Methyl-, Äthyl-, n-Propyl- und Isopropylalkohol während der Polymerisation von Methacrylsäuremethylester bei 100°C wurde aus der Bestimmung der Hydroxylendgruppen im Polymeren berechnet. Die Ergebnisse stimmen mit den durch die konventionellen Methoden erhaltenen Werten gut überein. Unter Berücksichtigung der aus der Endgruppenbestimmung erhaltenen Ergebnisse wird auch der Mechanismus der Übertragungsreaktion erörtert, und es wird geschlossen, daß die Übertragungsreaktion hauptsächlich durch Bruch der C—H-Bindung erfolgt.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1968.021160102
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  • 10
    Electronic Resource
    Electronic Resource
    Studies on addition polymerization in mixed solvent system. Part III. Chain transfer of glycols in the polymerization of methyl methacrylate (1969)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 128 (1969), S. 176-182 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Einfluß verschiedener Glykole auf die Kinetik und besonders auf die Kettenübertragung bei der Additionspolymerisation von Methylmethacrylat wurde untersucht. Die Polymerisation von Methylmethacrylat wurde in Lösungsmittelgemischen in homogener Phase bei 60 bis 80°C ausgeführt. Der Polymerisationsgrad wird als Folge der Kettenübertragung und der Verdünnung herabgesetzt, jedoch steigt er von einer bestimmten Konzentration an mit steigender Glykolkonzentration an. Dieses Anwachsen des Polymerisationsgrades wurde der verminderten Abbruchgeschwindigkeit zugeschrieben, die von der Knäuelbildung der wachsenden Polymerkette bei höheren Glykolkonzentrationen herrührt. Die Kettenübertragungskonstanten der Glykole steigen mit der Länge der Alkylgruppen. Dieses deutet darauf hin, daß die Kettenübertragung wahrscheinlich durch die Abspaltung eines Wasserstoffatoms der Alkylgruppe und nicht der OH-Gruppe der Glykole erfolgt.
    Notes: The role of different glycols for the overall kinetics and particularly for the chain transfer step in the addition polymerization of methyl methacrylate has been studied. The polymerization of methyl methacrylate has been carried out in the homogeneous phase using mixed solvent systems at 60 and 80°C. The degree of polymerization has been found to decrease owing to chain transfer and dilution but after a certain concentration, it gradually increased with increasing glycol concentration. This increase in the degree of polymerization has been attributed to a reduced termination rate resulting from the coiling of the growing polymer chain at higher glycol concentrations. The chain transfer constants of glycols have been found to increase with the size of the alkyl groups indicating thereby that the chain transfer probably occurs via the abstraction of an H atom from the alkyl group and not from the OH group of the glycols.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1969.021280116
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