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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of polyurethanes containing nucleic acid base derivatives as grafted pendants and their precursor amino functionalized polyurethane (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 3267-3281 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new route to polyurethanes containing nucleic acid base derivatives as grafted pendants have been established. The method is based on the grafting of 2-(thymin-1-yl)propionic acid (TPA) or 2-(adenin-9-yl)propionic acid (APA) onto amino functionalized polyurethane, poly[2-amino-2-methyl-1,3-propylene methylene bis(4-phenyl carbamate)] (PU-NH2, IX) at the primary amino group by the N-hydroxy compound of active ester technique. Two novel polymer models of polynucleic acid - poly[2-(2′-(thymin-1′-yl) propionamido)-2-methyl-1,3-propylene methylene bis(4-phenylcarbamate)] (PU-NHT, X) and poly[2-(2′-(adenin-9′-yl)propionamido)-2-methyl-1,3-propylene methylene bis(4-phenylcarbamate)] (PU-NHA-40, XI) - were obtained. The amino functional polyurethane was prepared by the following three step reactions; (1) Selective N-protection of N-benzyloxycarbonyloxy-5-norbornene-2,3-dicarbonimide (CbzONB) with 2-amino-2-methyl-1,3-propanediol gave the N-protecting diol monomer 2-benzyloxycarbonylamino-2-methyl-1,3-propanediol (CbzAMP); (2) N-Protecting polurethane poly(2-benzyloxycarbonylamino-2-methyl-methyl-1,3) propylene methylene bis(4-phenylcarbamate) (PU-NHCbz, VIII) was obtained by the polyaddition of 4,4′-diphenyl-methane diisocyanate (MDI) with CbzAMP. (3) Deprotection of PU-NHCbz produced amino polyurethane PU-NH2. Prior to polymer synthesis, the amidation of APA with 3-aminoheptane or diethylamine were carried out as a model reaction study and the related monomer model compounds were prepared by the same methods.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080251208
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  • 2
    Electronic Resource
    Electronic Resource
    Nucleic acid base grafted imino polyurethane (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 26 (1988), S. 1659-1669 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation of two model polymers of polynucleotides with linear polyurethane backbone and 2-(thymin-1-yl)propionyl or 2-(uracil-1-yl)propionyl group as grafted pendant are described. 2-(Thymin-1-yl)propionic acid (TPA) and 2-(uracil-1-yl)propionic acid (UPA) were grafted into partial imino functionalized polyurethane, poly[(β,β′-diethylene)amine methylene bis(4-phenylcarbamate)]-75 (PU-NH-75), at the secondary amino group through amide bonds with 1-hydroxybenzotriazole (HOBT) using the active ester technique. Two novel polymer models of polynucleotides, poly[(N-(2-(thymin-1-yl)propionyl)-β,β′-diethylene)amine methylene bis(4-phenylcarbamate)]-75 (PU-NT-75) and poly[(N-(2-(uracil-1-yl)propionyl)-β,β′-diethylene)amine methylene bis(4-phenylcarbamate)]-75 (PU-NU-75) were obtained. The imino polyurethane PU-NH-75 was produced from the partially deprotected N-Cbz imino polyurethane, poly[N-(benzyloxycarbonyl-β,β′-diethylene)amine methylene bis(4-phenylcarbamate)] (PU-NCbz) which was prepared by the polyaddition of 4,4′-diphenylmethane diisocyanate (MDI) with diol monomer N-benzyloxycarbonyl-β,β′-dihydroxyethylamine (CbzHEA). Selective N-protection of N-benzyloxycarbonyloxy-5-norbornene-2,3-bicarboximide (CbzONB) with β,β′-dihydroxyethylamine (HEA) gave the N-Cbz protected diol monomer HEA. The related monomer model compounds were also prepared by the same methods.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1988.080260616
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  • 3
    Electronic Resource
    Electronic Resource
    New synthetic route to alternating copoly(aromatic ester-aliphatic amide)s (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 25 (1987), S. 2155-2164 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preparation of three novel alternating copoly(aromatic ester-aliphatic amide)s containing the same ordered amide-amide-ester-ester (AAEE), the same para-disubstituted phenyl, and the different long methylene chain structure were described. 1,1′-(Adipoyl)bisbenzotriazole (AdBBT), 1,1′-(suberoyl)bisbenzotriazole (SuBBT), and 1,1′-(sebacoyl)bisbenzotriazole (SeBBT) were synthesized. These diacylbenzotriazoles were preferred to aminoethanol at the amino group because of the selective N-acylation of active acylamide of benzotriazole in excellent yield at room temperature to give diol monomers such as N,N′-bis(2-hydroxyethyl)adipic amide (HEAdA), N,N′-Bis(2-hydroxyethyl)subaric amide (HESuA), and N,N′-bis(2-hydroxyethyl)sebacic amide (HESeA). Polycondensation of 1,1′-(teraphthaloyl)bisbenzotrizole (tPBT) with HEAdA, HESuA, and HESeA gave the corresponding alternating copoly(aromatic ester-aliphatic amide)s: P(tPE-AdA), P(tPE-SuA), and P(tPE-SeA), respectively. The alternating copoly(aromatic ester-aliphatic amide)s were characterized by 1H-NMR spectra. The resulting polymers have two different chain units; one is chain unit of poly(ethylene terephthalate) and the other is a chain unit of polyamide-2,6, polyamide-2,8, and polyamide-2,10; both are linked via a C—N bond.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1987.080250812
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  • 4
    Electronic Resource
    Electronic Resource
    OnJ-integrals in the plane fracture of composite materials (1992)
    Springer
    Applied mathematics and mechanics 13 (1992), S. 281-287 
    Details
    ISSN: 1573-2754
    Keywords: J-integral ; crack tip ; composite material ; complex function method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract By using a complex function method in this paper, the complex form of J-integral of mixed mode crack tip for unidirectional plate of linear-elastic orthotropic composites is obtained first by substituting crack tip stresses and displacements into general formula of J-integral. And then, the path-independence of this J-integral is proved. Finally, the computing formula of this J-integral is derived. As special examples, the complex forms, path-independence and computing formulae of J-integrals of mode I and mode II crack tips for unidirectional plate of linear-elastic orthotropic composites are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457374
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  • 5
    Electronic Resource
    Electronic Resource
    Bright blue electroluminescence from an oxadiazole-containing copolymerWe thank Dr. A. J. Heeger and Dr. J. H. Long for valuable discussions. (1995)
    Weinheim : Wiley-Blackwell
    Advanced Materials 7 (1995), S. 559-561 
    Details
    ISSN: 0935-9648
    Keywords: 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 , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19950070610
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  • 6
    Electronic Resource
    Electronic Resource
    Imaging the structure of the p-n junction in polymer light-emitting electrochemical cellsWe thank Prof. David Cahen (Weizmann Institute) for suggesting the spatially resolved measurements and Prof. P. Petroff (UCSB) for making the OBIC instrumentation available to us. We thank Dr. G. Yu (UNIAX) and M. McGehee (UCSB) for help in the early phases of this research, work at UCSB was supported by the office of naval research (ONR) under n00014-91-J-1235 and by the Electric Power Research Institute (EPRI RP8007-21); work at UNIAX was partially supported by ONR under N00014-95-C-0356. (1996)
    Weinheim : Wiley-Blackwell
    Advanced Materials 8 (1996), S. 985-987 
    Details
    ISSN: 0935-9648
    Keywords: 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 , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19960081208
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamic fast-atom bombardment mass spectrometry of conjugated metabolites of benzo[a]pyrene (1991)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 5 (1991), S. 499-502 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The N-acetylcysteine, cysteine and gluathione conjugates of r-7,t-8-dihydroxy-t-9,10-oxy-7,8,9,10-tetrahydrobenzo[a]pyrene as well as sulphuric and glucuronic acid conjugates of hydroxybenzo[a]pyrenes have been studied by fast-atom bombardment mass spectrometry (FABMS). Dynamic FABMS has been shown to be advantageous over conventional static FABMS giving more intense spectra with less material in both positive-and negative-ion modes. The spectra show quasmolecular ions and fragment ions indicative of the aglycome and/or the conjugating group.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290051103
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