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  • 1
    Digitale Medien
    Digitale Medien
    Inverse gas chromatography studies of poly(dimethylsiloxane)-polycarbonate copolymers and blends (1981)
    s.l. : American Chemical Society
    Macromolecules 14 (1981), S. 1791-1797 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma50007a035
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  • 2
    Digitale Medien
    Digitale Medien
    Rational Geometry for measuring Elastic and Viscoelastic Parameters (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 735-735 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Elasticity investigations depend on measuring deformation in response to an applied force. The geometry of the area over which the force is applied to the specimen is important, for it will enter the interpretation of experimental data through the boundary conditions for the differential equations ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/217735a0
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  • 3
    Digitale Medien
    Digitale Medien
    Anionic copolymerization of butadiene and isoprene: Applicability of the terminal model to high conversion (1983)
    Springer
    Polymer bulletin 9 (1983), S. 292-298 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary The compositions of copolymers of butadiene (B) and isoprene (I), produced by anionic copolymerization with sec-butyl lithium initiator in hexane at 20–40°C gave a good fit at low conversions to the terminal model for copolymerization. Non-linear, “best estimates” of the reactivity ratios rB and rI were 2.82 and 0.42, 1.72 and 0.36, 2.18 and 0.35 at 20, 30 and 40°C. The rates of copolymerization at conversions up to 98% of total monomer gave a smooth relationship with the instantaneous feed composition, calculated using the terminal model, at each temperature and independent of the initial feed composition. These results are in accord with the terminal model being applicable to this anionic copolymerization from low to hiqh conversions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00262721
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  • 4
    Digitale Medien
    Digitale Medien
    Synthesis of hydroxyl-terminated polycarbonates of controlled number-average molecular weight (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 2289-2301 
    Details
    ISSN: 0360-6376
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Hydroxyl-terminated polycarbonates are important starting materials for the synthesis of multiblock copolymers. Earlier papers from our laboratory and elsewhere have demonstrated their utility in siloxane, aryl ether, and ester systems. One synthesis problem that must be addressed is the control of the number-average molecular weight and hence block size of the polycarbonate oligomeric precursor. The facile phosgene-hydroxyl reaction is often difficult to monitor precisely. The present article describes a novel, simple, and convenient technique for the synthesis of hydroxyl-terminated polycarbonates of well-controlled number-average molecular weight. The approach involves an in situ blocking of some of the phenolic groups either prior to or during phosgenation. The protecting groups are easily removed after the polymerization is complete. In a practical laboratory experiment the technique does not require any additional step beyond that necessary for the preparation of nonfunctional polycarbonates of controlled molecular weight. The method is demonstrated in this article with the polycarbonate of bisphenol-A via the use of trimethylchlorosilane, trifluoroacetic anhydride, and trifluoroacetic acid as blocking groups. Ultraviolet, 19F-NMR, and 1H-NMR measurements as well as vapor-pressure osmometry were used to characterize the oligomers.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1982.170200831
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  • 5
    Digitale Medien
    Digitale Medien
    Assessment of the adhesive bond properties of allyl 2-cyanoacrylate (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 1941-1949 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The adhesive bond of allyl 2-cyanoacrylate between steel substrates has been analyzed and compared to that of ethyl 2-cyanoacrylate. Mechanical strength as well as thermomechanical, calorimetric, thermogravimetric, and dynamic mechanical response was observed. It was demonstrated that the allyl 2-cyanoacrylate bonds exhibit improved temperature resistance owing to the formation of heat-induced crosslinks in the adhesive layer, resulting in much improved lap-shear strengths. Scanning electron microscopy of the fracture surfaces showed that plastic deformation occurred in the allyl 2-cyanoacrylate adhesive after thermal aging, while interfacial and brittle failure dominated all other cases.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1981.070260618
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  • 6
    Digitale Medien
    Digitale Medien
    Correlation of solubility in polydimethylsiloxane and polyisobutylene systems (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 307-315 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Solubility data of organic probes in polydimethylsiloxane (PDMS) and polyisobutylene (PIB) obtained by inverse gas chromatography (IGC) were collected from the literature and analyzed. Applying the principle of corresponding states, empirical correlations were derived and presented for the estimation of solubilities of nonpolar and slightly polar probe molecules in these polymers. Estimation of other thermodynamic properties, such as activity coefficient of the solute, Henry's law constant, Flory-Huggins interaction parameter, and heat of solution through the use of these correlation equations, was demonstrated.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1985.070300126
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  • 7
    Digitale Medien
    Digitale Medien
    Solubility of nonpolar and slightly polar organic compounds in low-density polyethylene by inverse gas chromatography with open tubular column (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 1815-1826 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Inverse gas chromatography (IGC) with open tubular column was used to determine low pressure solubilities of 13 organic solutes in low-density polyethylene (LDPE) for temperatures from 50 to 175°C. Based on the principle of corresponding states, two simple correlation equations were developed for estimation of the solubility of nonpolar and slightly polar solutes in rubbery and molten LDPE.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1985.070300503
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  • 8
    Digitale Medien
    Digitale Medien
    Viscoelastic character of poly(ethylene oxide) in aqueous solutions: Effect of shear rate, concentration, salt, and anionic surfactant (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 31 (1986), S. 333-340 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A technique useful for estimating the viscoelastic properties of dilute solution poly(ethylene oxide) was developed. With this technique, the effect of concentration, shear rate, presence of salt and/or anionic surfactant, and molecular weight on the viscoelastic properties in dilute solution were determined. Differences in the viscoelastic properties of commercial grade materials were observed. An explanation for the differences in salt and surfactant solutions based on formation of a weak ionic network is presented.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1986.070310204
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  • 9
    Digitale Medien
    Digitale Medien
    Effect of metal particle incorporation on adhesive and electrical properties of acetylene-terminated polyisoimide prepolymers (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 1295-1304 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Modification of properties of an addition-curing polyisoimide prepolymer is achieved by the incorporation of small metal particles. No evidence for the modification of the cure chemistry of the prepolymer is observed. Physical modification of the system is observed in electrical, dynamic mechanical, and adhesive properties. Compositions containing various volume fractions of metal and polymer were prepared. Two different molecular weights of prepolymer were studied. Samples were prepared by fabricating single overlap adhesive specimens to aluminum. These lap shear specimens were then used for the electrical and adhesive properties of the material. The electrical properties improved markedly at above 25 volume percent metal loading. The adhesive properties to aluminum showed a maximum at 20-25 volume percent loading. X-ray photoelectron spectroscopy was used to examine adhesive failure surfaces.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1988.070360605
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  • 10
    Digitale Medien
    Digitale Medien
    Accelerated imidization reactions using microwave radiation (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 1647-1653 
    Details
    ISSN: 0887-624X
    Schlagwort(e): microwave processing ; imidization ; rapid curing ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Microwave radiation has been clearly shown to result in enhancement of the rate of reaction for an imidization reaction. Analysis of the kinetic parameters showed that the apparent activation energy for the reaction was reduced from 105 to 55 kJ/mol, under the conditions of this experiment. The mechanism which has been proposed to explain this enhancement is based on the concept of a nonuniform temperature on a molecular scale, rather than a true reduction in the activation energy. © 1992 John Wiley & Sons, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1992.080300817
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