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  • Chemistry  (7)
  • Conducting polymers
  • 1965-1969  (6)
  • 1945-1949  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A study by single crystal, x-ray diffraction methods of a silver amalgam known as “arbor dianae” has shown it to be twinned on the [111] cubic crystal planes. Otherwise, they are identical to the material known mineralogically as moschellandsbergite or the γ-phase in dental amalgam and the γ1-phase in the silver-mercury system.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The previous x-ray analysis and structure refinement of the gamma phase of the silver-mercury system was not completely correct. This study confirms the atomic positional coordinates in the cubic system and gives a more complete refinement of the thermal parameters.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: This paper reports on three investigations into the toxic potential of plastics, resins and addivtives, with emphasis on those having medical, dental, or pharmaceutical application. The following points were noted: (1) two different lots of PVC resin contained toxic material which was leachable into a biological system and an extreme eosinophilic response was noted; (2) a large group of chemical agents currently being used or having potential for use in various plastics formulations were investigated for toxic potential. As a group, the stabilizers showed the greatest degree of toxicity and if these are used in conjunction with a plasticizer in a plastic formulation, the toxic potential is greatly increased due to an increased opportunity to migrate from the plastic. It may be concluded from this work that safe plastics for medical, dental, and pharmaceutical applications can technically be manufactured. In order to protect the patient who ultimately comes in contact with the plastic device in one way or another, it behooves the concerned manufacturer to be certain his product is not responsible for injury to the user. This certianty can only be gained by an adequate and diverse evaluation program.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 2 (1947), S. 275-280 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Tetrachlorophthalic anhydride (TCPA) was reacted with cellulose diacetate and with cellulose diethyl ether in dioxane solution to produce esters with rather low tetrachlorophthalyl contents. Phthalic anhydride was found to be considerably more reactive than was TCPA with these cellulose derivatives, especially if pyridine was used as the reaction solvent. Acylations could not be executed with TCPA in the presence of pyridine as solvent, however, because this material decomposed the anhydride, removing chlorine from it. The TCPA derivatives were more limited in solubility than were the corresponding esters made from phthalic anhydride.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 1-Methylene-4-vinylcyclohexane was prepared by the following reaction sequence: (1) conversion of 4-methylene-cyclohexane methanol to the tosylate, (2) oxidation of the tosylate to 4-methylenecyclohexane carboaldehyde by the method of Kornblum, and (3) reaction of the aldehyde with the ylide from triphenylmethylphosphonium bromide in a Wittig reaction to produce the diene. Polymerization of 1-methylene-4-vinylcyclohexane was attempted with the use of free radical, anionic, cationic, and Ziegler-type initiators. Polymers were obtained from the cationic (boron trifluoride) and Ziegler (titanium tetrachloride and triethylaluminum complex)-initiated reactions. The polymer obtained by polymerization of this monomer with gaseous boron trifluoride as the initiator led to a solid polymer which was soluble in a number of organic solvents and had a softening temperature of 150°C. The infrared spectrum of this polymer gave absorption bands for terminal unsaturation. NMR analysis indicated that the unsaturation ratio was one double bond per two monomer units. The NMR analysis also indicated that this unsaturation was due to vinyl rather than methylene groups. Polymerization of this monomer by use of a Ziegler catalyst (titanium tetrachloride and triethylaluminum) led to a solid polymer of which 10% was soluble in a number of organic solvents. Although the infrared spectrum of this polymer indicated the presence of some terminal unsaturation, an NMR analysis indicated only an extremely small amount of residual unsaturation. The essential absence of unsaturation in this linear polymer supports an intramolecular interaction in this monomer, since Ziegler-type initiators do not ordinarily initiate polymerization of the isobutylene type. These results can be interpreted as additional evidence for the nonbonded interaction concept as a driving force to cyclic polymer.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Ethylene oxide appears to be an ideal sterilant for many heat-sensitive items, but there are a number of disadvantages which require caution in its usage. Ethylene oxide has some deleterious effects on certain plastics and rubber. In particular, it acts as a solvent on such acrylic plastics as Lucite and Plexiglas, and it will attack the plasticizers found in many flexible medical-grade tubing formulations. Perhaps more significant is the fact that this sterilant can produce some serious toxic manifestations when medical plastics are not properly degassed. This paper reviews some of the toxicities already reported in the medical literature and also presents new data on the hemolysis liability of many gassterilized pharmaceutical plastics. Both human blood hemolysis studies and cell culture data on 18 different polymers suggest that plasticized vinyl plastics have the highest toxicogenic potential. Experimental data presented on the solubility and partial pressure of ethylene oxide in a homologous series of phthalic acid esters indicate that the structure and concentration of plasticizers play a major role in the selection of the most effective degassing procedures to be used following ethylene oxide sterilization.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0449-2986
    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
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