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  • 1
    Electronic Resource
    Electronic Resource
    Chromatographic investigations of macromolecules in the ''critical range'' of liquid chromatography - II. Two-dimensional separations of poly(ethylene oxide-block-propylene oxide)
    Amsterdam : Elsevier
    Journal of Chromatography A 623 (1992), S. 315-322 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0021-9673(92)80371-Z
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  • 2
    Electronic Resource
    Electronic Resource
    Chromatographic investigations of macromolecules in the ''critical range'' of liquid chromatography - I. Functionality type and composition distribution in polyethylene oxide and polypropylene oxide copolymers
    Amsterdam : Elsevier
    Journal of Chromatography A 523 (1990), S. 91-102 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0021-9673(90)85014-M
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of benzyloxy-terminated poly(1,3,6-trioxocane)s by supercritical fluid chromatography
    Amsterdam : Elsevier
    Journal of Chromatography A 589 (1992), S. 295-299 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0021-9673(92)80035-S
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  • 4
    Electronic Resource
    Electronic Resource
    Graft-copolymerization of PVC with polymerizable UV absorbers (1991)
    Springer
    Polymer bulletin 26 (1991), S. 39-46 
    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 Polyvlnyl chloride has been grafted with two different monofunctional polymerizable ultraviolet (UV) absorbers, 4-methacryloyloxy-2-hydroxybenzophenone and 2(2-hydroxy-4-methacryloyloxyphenyl) 2H-5-methoxy-benzotriazole. PVC was activated by dehydrochlorinating it in pyridine and subsequently grafted with the monomeric UV absorbers in tetrahydrofuran by free radical polymerization. The molar masses of the resulting grafted polymers and the distribution of the UV absorber moleties along different molar mass fractions were determined by GPC. It was shown that in addition to the grafting reaction, recombination of the DHPVC and homopolymerization of the UV absorber molecules take place.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299346
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  • 5
    Electronic Resource
    Electronic Resource
    On-line HPLC 1H NMR coupling for the analysis of fatty alcohol ethoxylates (1997)
    Springer
    Polymer bulletin 38 (1997), S. 673-679 
    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. The characterisation of fatty alcohol ethoxylate based surfactants by on-line LC-NMR coupling is described. Different surfactant mixtures were separated by a mixed exclusion-adsorption method of liquid chromatography and simultaneously characterised by 1H-NMR spectroscopy. Information about the degree of oligomerisation of the ethylene oxide chain and the chemical structure of the endgroups can be obtained in a one-step experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050104
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of poly(chlorophenyl methacrylates) by ultraviolet spectroscopy (1991)
    Springer
    Polymer bulletin 26 (1991), S. 79-86 
    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 A number of copolymers of methyl methacrylate and chlorophenyl methacrylates of different structure was prepared and analyzed by ultraviolet spectroscopy. It was found that the copolymer composition can be determined using a calibration curve based on mixtures of the appropriate homopolymers. The U. V. spectroscopical results are in good agreement with the chlorine analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00299351
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  • 7
    Electronic Resource
    Electronic Resource
    Nonlinear one-parametric minimal cost network flow problems (1982)
    Springer
    OR spectrum 4 (1982), S. 129-134 
    Details
    ISSN: 1436-6304
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Minimale Kostenflußprobleme mit nichtlinearen parametrischen Bewertungsfunktionenc(t) T x mitt aus dem Intervall [t min,t max] werden untersucht. Es wird eine endliche Folge zuläs siger Basen (B k ¦k =1, 2,...,r) bestimmt, die inI k := [t k , tk+1] optimal sind (k=1, 2, ...,r;t min=t 1 〈t 2 〈 ... 〈t r+1=t max). Die Teilintervalle Ik werden durch die Berechnung von Nullstellen bestimmter nichtlinearer Funktionen ermittelt. Numerische Ergebnisse werden für den Spezialfall polynomialer parametrischer Kostenfunktionen diskutiert.
    Notes: Summary Minimal cost network flow problems with nonlinear parametric objective functionsc(t) T x fortε[t min,t max] are studied. A finite sequence of feasible bases (B k ¦k =1, 2, ...,r) optimal in [t k , tk+1] fork=1, 2,...,r witht min=t 1〈t 2〈...〈t r+1=t max is determined using the zeroes of a set of nonlinear functions. Computional experience is discussed in the special case of polynomial parametric objective functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01720215
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of polymers containing naphthyl-2H-benzotriazoles, 3. Hydrogen bonding in monomers and polymers containing naphthyl-2H-benzotriazolePart 2 cf. ref.6. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 65-78 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Von einigen Dihydroxynaphthyl-2H-benzotriazolen, deren (Meth-)Acryloyloxy-Derivaten und den entsprechenden Polymeren wurden die UV-Absorptionscharakteristika in einer Reihe unterschiedlich polarer Lösungsmittel untersucht. Es konnte gezeigt werden, daß die Bildung von Wasserstoffbrücken in diesen Verbindungen sehr stark von der Polarität des Lösungsmittels abhängt und daß ein Gleichgewicht zwischen intraund intermolekularen H-Brücken besteht; die Stabilität der intramolekularen Hßrücken konnte quantitativ bestimmt werden. Die Lage dieses Gleichgewichts wird von der chemischen Struktur der Naphthyl-2H-benzotriazole wesentlich beeinflußt; die Stabilität intramolekularer H-Brücken konnte durch elektronenschiebende Substituenten am Naphthyl-2H-benzotriazol oder durch dessen Fixierung entlang einer Polymerkette gesteigert werden.
    Notes: The UV absorption characteristics of a number of dihydroxynaphthyl-2H-benzotriazoles, their (meth)acryloyloxy derivatives and the corresponding polymers have been studied in a range of solvents of different polarity. It was shown that the formation of hydrogen bonds in these compounds strongly depends on the polarity of the solvent and an equilibrium exists between intramolecular and intermolecular hydrogenbonded states. The stability of the intramolecular hydrogen bond was determined quantitatively. The equilibrium between the intramolecular and the intermolecular hydrogen-bonded state of the molecule was strongly affected by the chemical structure of the naphthyl-2H-benzotriazole. The stability of the intramolecular hydrogen bond increased when electron-donating substituents were introduced into the benzotriazole or when the naphthyl-2-benzotriazole was fixed to a polymer backbone.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051940106
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of polymers containing naphthyl-2H-benzotriazoles, 1. Monomer synthesis and characterization (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 193 (1991), S. 147-158 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 2-(2-Hydroxynaphthyl)-2H-benzotriazole wurden durch Azokupplung von o-Nitro-benzoldiazoniumchlorid mit 2,3-, 2,5- bzw. 2,7-Dihydroxynaphthalin und anschlie-ßende reduktive Cyclisierung mit Zinkpulver hergestellt. Der Verlauf der Kupplungsreaktion wurde anhand von NMR-Messungen untersucht und zeigte, daß die Kupplung ausschließlich in α-Position der Dihydroxynaphthaline erfolgte. Die Reaktion von 2-(2,7-Dihydroxynaphthyl)-2H-benzotriazol mit (Meth-)Acrylsäurechlorid ergab das entsprechende (Meth-)Acryloyl-naphthalin-2H-benzotriazol-Derivat, das zusammen mit den dazugehörenden Methoxy- und Chlorderivaten eine neue Klasse (co-)polymerisierbarer, UV-absorbierender Verbindungen bildet.
    Notes: 2-(2-Hydroxynaphthyl)-2H-benzotriazoles were synthesized by azo coupling of o-nitrobenzene diazonium chloride with 2,3-, 2,5-, and 2,7-dihydroxynaphthalenes, respectively, followed by reductive cyclization with zinc powder and sodium hydroxide. The mode of coupling reactions has been elucidated using NMR spectroscopy and showed that the coupling occurred at the α-position of the dihydroxynaphthalenes. The treatment of 2-(2,7-dihydroxynaphthyl)-2H-benzotriazole with acryloyl or methacryloyl chloride, respectively, gave the corresponding (meth)acryloyloxynaphthyl-2H-benzotriazoles, which, along with their methoxy and chloro derivatives, provide a new class of polymerizable UV absorbers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051930114
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of polymers containing naphthyl-2H-benzotriazoles, 2Part 1 cf. ref.4. Polymer synthesis and characterization (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 193 (1991), S. 159-167 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 2-(2-Hydroxy-7-(meth)acryloyloxynaphthyl)-2H-benzotriazole wurden in Dichlormethan unter Verwendung von AIBN als Initiator sowohl homo- als auch mit Styrol bzw. Methylmethacrylat copolymerisiert. Die Polymerzusammensetzung wurde UV-spektroskopisch untersucht und mit entsprechenden, elementaranalytisch bestimmten Werten verglichen; die Molekulargewichte wurden gelpermeationschromatographisch gemessen. Aufgrund der räumlich sehr anspruchsvollen Naphthyl-2H-benzotriazol-Einheit wurden bei der Homopolymerisation nur verhältnismäßig niedermolekulare Produkte erhalten. Bei der Copolymerisation mit Methylmethacrylat zeigte sich, daß die Zusammensetzung der erhaltenen Copolymeren mit dem eingesetzten Monomerverhältnis nahezu identisch war; dagegen wies die Copolymerisation mit Styrol einen deutlich höheren Anteil an eingebautem Naphthyl-2 H-benzotriazol auf.
    Notes: 2-(2-Hydroxy-7-(meth)acryloyloxynaphthyl)-2H-benzotriazoles were polymerized and copolymerized with styrene and methyl methacrylate in dichloromethane using azoisobutyronitrile as the initiator. The polymer composition was determined by UV spectroscopy and compared with elemental analytical data; the molecular weights were determined by GPC. In homopolymerization, low molecular weight products were obtained due to the bulky naphthyl-2H-benzotriazole units. In the case of copolymerization with methyl methacrylate it was found, that the composition of the polymers was very close to the initial ratio of the monomers, whereas in copolymers with styrene the amount of incorporated benzotriazole was higher.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051930115
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