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  • Polymer and Materials Science  (8,676)
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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and thermal transitions of a soluble, main chain, nematic liquid crystalline polymer exhibiting a kinetically trapped, disordered structure (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 1347-1361 
    Details
    ISSN: 0887-6266
    Keywords: liquid crystalline polymer ; nematic ; isotropic/nematic transition ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An aromatic copolyester composed of 25 mol % phenyl hydroquinone, 10 mol % isophthalic acid, 40 mol % chloroterephthalic acid, and 25 mol % t-butyl hydroquinone (PICT) has been synthesized. This amorphous, glassy polymer is soluble in common organic solvents such as methylene chloride. Thin, solution-cast films may be prepared which are in a metastable, vitrified, optically isotropic state. On first heating of an isotropic film at 20°C/min in a calorimeter, one glass transition is observed at low temperature (approximately 49°C) and is ascribed to the glass/rubber transition of the metastable, isotropic polymer. This thermal event is followed by a small exotherm due to the development of order during the scan, which results in a second Tg at approximately 125°C. This Tg is associated with the glass/rubber transition of the ordered polymer. Nematic order can be developed by thermal annealing. The lower Tg increases toward the upper Tg as annealing time is increased. For an initially isotropic film annealed at 90°C, the increase of the lower Tg with annealing time and the increase in birefringence observed by optical microscopy are governed by similar kinetics. Isotropization occurs in the temperature range of 250-300°C. The nematic polymer is slightly more dense than its isotropic analog. No detectable differences between isotropic and nematic samples were observed in rotating frame proton spin lattice relaxation times. © 1996 John Wiley & Sons, Inc.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks of polyurethanes and epoxy resin, II. Compatibility and morphologyPart I cf.10. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 15-22 
    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: Interpenetrierende Netzwerke (IPN) aus Polyurethanen (PU) und dem Glycidylether eines Phenol-Formaldehyd-Kondensates (GEPF) wurden durch gleichzeitige Polymerisation („Cokondensation“) hergestellt. Die dynamisch-mechanischen Eigenschaften und die Morphologie dieser IPN wurden untersucht. Dabei zeigte sich, daß PU/GEPF IPN eine Mehrphasen-Morphologie aufweisen. Mit PU sowohl auf Polyesterpolyol- als auch auf Polyetherpolyol-Basis zeigten die dynamisch-mechanischen Analysen (DMA) verschiedene Verschiebungen der Verlustmoduli (E″) der Hoch- und Niedertemperaturübergangsbereiche in Abhängigkeit von Typ und Molekulargewicht der im PU verwendeten Polyol-Komponente. Drei verschiedene übergangsbereiche konnten bis zu einem bestimmten PU-Gehalt beobachtet werden.
    Notes: The interpenetrating polymer networks (IPN) of polyurethanes (PU) and a glycidyl ether of phenol formaldehyde (GEPF) were prepared by a simultaneous polymerization method. The dynamic mechanical properties and morphologies of the IPNs were investigated. It was found that multiphased morphology was formed in the PU/GEPF IPNs. With the PU based on polyester- or polyether-type polyols, the dynamic mechanical analysis (DMA) of these IPNs exhibited various shifts in the loss moduli (E″) of the high and low temperature transition domains depending upon the types and molecular weights of the polyols employed in the PU. Three distinct transition domains were observed as the PU content increased up to a certain level.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051940102
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  • 3
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer networks of polyurethanes and epoxy resin, I. Mechanical behavior (1991)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 193 (1991), S. 89-98 
    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: Interpenetrierende Netzwerke (IPN) aus Polyurethanen (PU) und dem Glycidylether eines Phenol-Formaldehyd-Kondensates (GEPF) wurden durch gleichzeitige Polymerisation („Cokondensation“) hergestellt. Der Einfluß des PU-Molekulargewichts und -Gehalts auf die mechanischen Eigenschaften wird diskutiert. Bei PU/GEPF IPN aus Polyester-Typ-PU nahmen mit steigendem PU-Gehalt sowohl die Zugfestigkeit als auch die Bruchenergie ab, während die Schlagfestigkeit signifikant anstieg. Demgegenüber zeigten PU/GEPF IPN aus Polyether-Typ-PU eine sinkende Heterogenität mit abnehmendem Molekulargewicht der Polyetherpolyol-Komponente im PU und dementsprechend eine Zunahme sowohl der Zugfestigkeit als auch der Bruchenergie. Die Schlagfestigkeit zeigte dagegen mit steigendem PU-Gehalt zunächst einen Anstieg zu einem Maximalwert, um dann wieder abzufallen.
    Notes: The interpenetrating polymer networks (IPNs) prepared from polyurethane (PU) and a glycidyl ether of phenol formaldehyde (GEPF) were synthesized by using a simultaneous polymerization method. The effects of PU molecular weight and amount on the mechanical property are discussed. For the PU/GEPF IPNs based on polyester-type PU, as the PU content was increased, the tensile strength and fracture energy decreased, but the impact strength increased significantly. However, for the PU/GEPF IPNs based on polyether-type PU, the extent of heterogeneity was decreased with decreasing molecular weight of polyether polyol in PU and the tensile strength and fracture energy were enhanced. The impact strength increased to a maximum value and then decreased when the PU content was further increased.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1991.051930109
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  • 4
    Electronic Resource
    Electronic Resource
    Solution behavior of ampholytic styrene ionomers (1984)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 22 (1984), S. 2005-2016 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this article are described the solution properties of ampholytic ionomers obtained by the radical copolymerization of styrene with the ion-pair comonomer 3-methacrylamidopropyltrimethylammonium, 2-acrylamido-2-methylpropanesulfonate. The solution properties were studied in mixed solvents, with a good solvent for the polystyrene backbone and another for the ionic moieties, and in the individual good solvent of benzyl alcohol. The data obtained strongly support extensive intermolecular ionic interactions in solution.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1984.170220906
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  • 5
    Electronic Resource
    Electronic Resource
    Polymerization of vinylpyridinium salts. IX. Preparation of monomeric salt pairs (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 15 (1977), S. 487-491 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.130150808
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  • 6
    Electronic Resource
    Electronic Resource
    Ampholytic polystyrene ionomers from cationic-anionic monomer pairs (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 2983-2992 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preparation of a new form of ionomer is described. This class of material is based on the polymerization of a neutral monomer with a small amount of a cationic-anionic monomer pair. The resulting ionomers are ampholytic in character and contain no inorganic ions. In this investigation, the polymerization of styrene with 3-methacrylamidopropyldimethylammonium and trimethylammonium 2-acrylamido-2-methylpropanesulfonate in a variety of solvents is described.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.170181008
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of a new composite material: Fe2O3-impregnated poly(tetrafluorethylene). Particle size determination and photoacoustic spectroscopy (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 1427-1433 
    Details
    ISSN: 0021-8995
    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
    Notes: Iron carbonyl sorption in PTFE, followed by in situ oxidation, gives the composite material, iron oxide-PTFE. Oxide particle size determination was performed by electron microscopy. The particles were found to be nearly spherical and very small, having diameters in the 30-40 Å range on average. Optical absorption spectra were obtained by photoacoustic spectroscopy, and their intensities show a complex dependence on iron oxide concentration in the samples.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1980.070250716
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  • 8
    Electronic Resource
    Electronic Resource
    Depolymerization of poly(ethylene terephthalate) resin under pressure (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 1501-1507 
    Details
    ISSN: 0021-8995
    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
    Notes: The process of depolymerization of PET resin by EG glycolysis under pressure is investigated. The kinetics of this pressurized depolymerization of PET resin is discussed. It was found that the rate of depolymerization is dependent of temperature, pressure, and concentration ratio of EG to PET. The rate of depolymerization is proportional to the square of EG concentration and faster than that under atmospheric pressure. Glycolyzed products under pressure consist of the PET monomer, BHET, and oligomers, mostly dimer and trimer. An equilibrium between BHET and oligomers is attained quickly soon after the depolymerization step is completed in the case of a higher ratio of EG/PET used. In the case of lower ratio of EG/PET, the final product now consists of higher molecular weight of oligomers rather than monomer, dimer, and trimer.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420603
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  • 9
    Electronic Resource
    Electronic Resource
    Syntheses of stereoregular and optically active polyamides from active 4-chloro-1-benzotriazolyl diesters and diamines (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 75-85 
    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 prepare optically active polyamides was established, based on the polycondensation of two new active diesters: the active diesters of 4-chloro-1 hydroxybenzotriazole, such as 1,1'-(terephthaloyldioxy)bis(4-chloro-benzotriazole), and 1,1'-(isophthaloyldioxy)bis(4-chlorobenzotriazole), with optically active isomers of 2,4-diaminopentane. Dipolar aprotic solvents such as N,N-dimethylformamide and dimethyl sulfoxide were used as reaction solvents. The solution polycondensation carried out in solution at room temperature afforded optically active polyamides. The aminolysis of the two active diesters was carried out as a model reaction study.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1986.080240106
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis, processing, and third-order nonlinear optical properties of benzobisthiazole polymers containing thiophene moieties (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 723-729 
    Details
    ISSN: 0887-624X
    Keywords: benzobisthiazole ; nonlinear optical ; thiophene ; degenerate four-wave mixing ; bithiophene ; terthiophene ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Benzobisthiazole polymers containing mono-, bi-, and terthiophene moieties were synthesized through polycondensation in polyphosphoric acid of 2,5-diamino-1,4-benzenedithiol dihydrochloride with thiophene-2,5-dicarboxylic acid, 2,2′-bithiophene-5,5′-dicarboxylic acid, and 2,2′:5′,2″-terthlophene-5,5″-dicarboxylic acid, or their corresponding diacid chlorides, respectively. Intrinsic viscosities of up to 8.1 dL/g (methanesulfonic acid, 30°C) were recorded. Polymer structures were verified by elemental analysis and spectroscopic comparison of the polymers with appropriate model compounds. Onset of breakdown under thermogravimetric analysis in air occurred in the 460-590°C range with the benzobisthiazole polymers containing a monothiophene linkage being the most stable. Films suitable for third-order optical susceptibility measurements could be prepared by extrusion techniques from the benzobisthiazole polymer containing a monothiophene linkage. Degenerate four wave mixing measurements on this film yielded a third order optical susceptibility χ(3) of approximately 4.5 × 10-10 esu. © 1993 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310317
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