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  • Polymer and Materials Science  (88)
  • 2020-2024
  • 2000-2004
  • 1990-1994  (69)
  • 1965-1969  (19)
  • 1940-1944
  • 1
    Electronic Resource
    Electronic Resource
    Effect of structure and composition on physico-mechanical properties of methyl methacrylate/alkyl (meth)acrylate copolymers (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 205 (1993), S. 47-58 
    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: Methylmethacrylat (MMA) mit einem Prepolymergehalt von 6-8% wurde mit unterschiedlichen Anteilen (1-20%) 2-Ethylhexylmethacrylat (EMMA), n-Hexylmethacrylat (HMA), 2-Ethylhexylacrylat (EHA) oder n-Hexylacrylat (HA) copolymerisiert. Aus den erhaltenen Copolymeren wurden Folien hergestellt, an denen der Einfluß der Copolymerstruktur auf Lichtdurchlässigkeit, Dichte und mechanische Eigenschaften ermittelt wurde. zugsfestigkeit and Speichermodul nahmen mit zunehmendem Comonomergehalt ab. Die Dehnung stieg im Fall von MMA/EHA- und MMA/HA-Copolymerfolien mit 15 und 20 Gew.-% Comonomeranteil merklich an. Mittels DMTA wurde die Erweichungstemperatur der Copolymeren bestimmt. Die HDT und die Erweichungstemperatur nahmen unter Biegebelastung mit steigendem Comonomergehalt de Copolymeren ab.
    Notes: The paper describes the fabrication of cast acrylic sheets by copolymerizing a prepolymer syrup of methyl methacrylate (MMA) with varying amounts (1-20 wt.-%) of 2-ethylhexyl methacrylate (EHMA), n-hexyl methacrylate (HMA), 2-ethylhexyl acrylate (EHA) and n-hexyl acrylate (HA). The effect of structure of copolymer on light transmittance, density and mechanical properties was evaluated. Tensile strength and storage modulus decreased with increasing comonomer content. Strain increased significantly in the case of MMA/EHA and MMA/HA copolymer sheets having 15 and 20 wt.-% of comonomer. Softening temperature of copolymer samples was determined using dynamic mechanical thermal analysis. Heat deflection temperature under flexural load and softening temperature decreased with increasing comonomer content in copolymer.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052050104
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of α-methyl styrene on curing behaviour and interfacial properties of glass fibre-reinforced vinyl ester resins (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 212 (1993), S. 67-75 
    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: Die Härtungseigenschaften des Bismethacrylat-Derivates von Bisphenol-A-diglycidylether (VE-Harz) mit Styrol und α-Methylstyrol (MS) als Reaktivverdünner wurden untersucht. Ein zunehmender Gehalt an MS verzögerte die Härtung. Mit Glasfasermatten, die teilweise mit γ-Methacryloyloxyropyl-trimethoxysilan (MTS) behandelt waren, wurden Composites hergestellt, deren Grenzflächen-Scherspannung mit der Ein-Faser-Methode gemessen wurde. Die Beschichtung mit MTS verbesserte die Grenzflächen-Scherspannung der Composites um ca. 30-50%. Ein MS-Gehalt von bis zu 5 Gew.-% MS hatte keinen Einfluß auf die interlaminare Scherfestigkeit (ILSS), weder bei den glasfaserverstärkten Composites noch bei den Ein-Faser-Proben. Eine Erhöhung des MS-Anteils auf 15 Gew.-% verbesserte sowohl die ILSS als auch die Biegesteifigkeit und die Biegefestigkeit.
    Notes: The curing behaviour of bismethacryloyl derivative of diglycidyl ether of bisphenol A (vinyl ester VE resin) containing styrene and α-methyl styrene (MS) as reactive diluents was studied. Delayed curing was observed in samples containing increasing proportions of MS. Interfacial shear stress of untreated as well as γ-methacryloyloxy-propyl trimethoxy silane (MTS) treated, glass fibre-reinforced VE resin composites were measured by single fibre technique. In comparison to untreated glass fibres, a 30 - 50% increase in interfacial shear stress was observed in composites based on MTS treated glass fibres. Addition of up to 5 wt.-% MS to VE resin did not affect the interfacial shear strength (ILSS). This behaviour was observed by using ILSS measurement of both glass fabric-reinforced composites as well as single fibre specimens. Further increase in MS to 15 wt.-% resulted in an increase in ILSS and bending stiffness as well as flexural strength.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052120107
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  • 3
    Electronic Resource
    Electronic Resource
    Design of monomers for nonshrinking polymerizations, and synthesis of some N, S-analogs of spiroorthocarbonates (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 1667-1673 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The design of spiroorthocarbonate monomers (SOCs) and related structures is discussed with the aim of maximizing monomer polymerizability in the absence of undesirable byproducts. The successful syntheses of N,S-analogs of aryl- and alkaryl-SOCs are reported; these are monomers of structure where P and Q are —O— and —OC(CH3)2-, mp 156-158°C; and P and Q are —OCH2— and —OCH2—, mp 148-150°C. As is indicated by infrared spectra, the polymerization of both monomers is initiated by boron trifluoride etherate. © 1993 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310704
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  • 4
    Electronic Resource
    Electronic Resource
    Phase behavior of cyclic siloxane-based liquid crystalline compounds (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 32 (1994), S. 2039-2047 
    Details
    ISSN: 0887-624X
    Keywords: liquid crystal ; cyclic siloxane ; hydrosilation ; cholesterol ; biphenyl ; phase behavior ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of 24 cyclic siloxane-based liquid crystalline compounds was synthesized using conventional hydrosilation chemistry. Variables examined included ring size, spacer group length, and type and composition of pendant mesogeric groups. Both pentamethylhydro- and tetramethylhydrosiloxane rings were reacted with mesogens based on cholesterol, biphenyl, or equimolar mixtures of both. Four different length spacer groups containing terminal vinyl groups were used to attach the mesogens to the cyclic siloxane core. The thermotropic liquid crystalline phase behavior was studied using differential scanning calorimetry (DSC) and polarized optical microscopy (POM). A lengthening of spacer groups resulted in lower crystallization temperatures for the biphenyl-based compounds and lower glass transition temperatures for the cholesterol- and mixed mesogen-based compounds. The tetramethyl ring derivatives exhibited higher glass transition or crystallization temperatures than their pentamethyl counterparts. Biphenyl-based compounds exhibited low temperature crystalline phases while the cholesterol-based compounds exhibited low temperature glassy phases. © 1994 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1994.080321105
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  • 5
    Electronic Resource
    Electronic Resource
    Platinum and the hot corrosion behaviour of a nickel based superalloy (1990)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 41 (1990), S. 710-715 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Platin und das Heißgaskorrosionsverhalten einer Superlegierung auf NickelbasisDas Verhalten einer Platin enthaltenden Superlegierung auf Nickelbasis (RJM 2012) bei Heißgaskorrosion wird mit dem Verhalten einer ähnlichen, jedoch kein Platin enthaltenden Legierung (IN 792 + Hf) verglichen. Die Ergebnisse der Versuche im Brenner-Prüfstand bei 800°C zeigen, daß die Zunderschichten auf der platinhaltigen Legierung auch nach 1000 h noch schützend wirken, während die platinfreie Legierung schon nach 200 h stark angegriffen wird. Der Einfluß des Platins auf den Schädigungsmechanismus wird erörtert.
    Notes: The hot corrosion behaviour of a platinum containing nickel based superalloy (RJM 2012) is compared with that of a similar alloy (IN 792 + Hf) without platinum. The results of burner rig testing at 800°C showed that the oxide scales on the platinum containing alloy were still very protective after 1000 h on test whilst the alloy without platinum was severely attacked after only 200 h. The influence of platinum on the degradation mechanisms is discussed.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19900411211
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  • 6
    Electronic Resource
    Electronic Resource
    Capillary electrophoresis - electrochemistry of microdialysis samples for pharmacokinetic studies (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 463-468 
    Details
    ISSN: 1040-0397
    Keywords: Microdialysis sampling ; capillary electrophoresis ; electrochemical detection ; L-dopa ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrochemical detection has been shown to be a sensitive method of detection in capillary electrophoresis (CE). The small sample volume required for CE makes it ideal for the analysis of microdialysis samples. In this paper, capillary electrophoresis with electrochemical detection is utilized in the analysis of samples obtained during continuous monitoring of the pharmacokinetics of L-dopa in the rat. The detection limit for L-dopa was 98 attomoles or 3.9 ng/mL. The elimination half-life was calculated to be 10.3 ± 1.1 minutes. Voltammetric characterization was used to verify the identity of L-dopa and its metabolites. The effects of electrochemical pretreatment on the detector performance was also investigated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040412
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of α-methyl styrene on properties of epoxy-novolac based vinyl ester resins (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 211 (1993), S. 157-164 
    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: Ein Vinylesterharz auf der Basis eines epoxidierten Novolakes wurde mit Styrol/a-Methylstyrol-Gemischen unterschiedlicher Zusammensetzung als Reaktvverdünner vernetzt. Das Hürtungsverhalten wurde anhand der Gelbildungszeit untersucht. Mit zunehmendem Gehalt an a-Methylstyrol verzögerte sich die Härtungsreaktion, und die Zugfestigkeit der ausgehärteten Harze verschlechterte sich bei gleichzeitiger Verbesserung der Wärmestandfestigkeit. Die Biegefestigkeit und der Biegemodul sowohl der ausgehärteten Harze als auch damit hergestellter Glasfaserlaminate (Harzgehalt ca. 41 Gew.-%) nahmen zu. Zwölfstündige Lagerung der Laminate in siedendem Wasser führte mit steigendem Gehalt an α-Methylstyrolzu einer Verringerung der interlaminaren Scherfestigkeit.
    Notes: The paper describes the synthesis of vinyl esters using epoxy-novolac resin. The curing behaviour of the resins containing different portions of styrene and α-methyl styrene (α-MS) as reactive diluents was studied by gel time determination. Delayed curing was observed in samples containing increasing proportions of α-MS. An increase in the α-MS content resulted in a decrease in the tensile strength and increase in heat deflection temperature of the cured sheets. The flexural strength and flexural modulus of both resin and glass fibre-reinforced composites (resin content approx. 41 wt.-%) increased. Treatment with boiling water (12 h) of laminates resulted in a decrease in interlaminar shear strength with an increase in α-MS content.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052110114
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  • 8
    Electronic Resource
    Electronic Resource
    Copolymers of methyl methacrylate and N-cyclohexyl maleimide: Preparation and properties (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 221 (1994), S. 1-9 
    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: Durch radikalische Copolymerisation von Methylmethacrylat (MMA) und N-Cyclo-hexylmaleimid (NCM) in Benzol wurden Copolymere mit niedriger Grenzviskosität erhalten. Copolymere mit NCM-Gehalten zwischen 0 und 30 Gew.-% und wesentlich höheren Grenzviskositäten wurden auch mittels Copolymerisation in Substanz in Form von Platten hergestellt. Eine Erhöhung des NCM-Gehaltes bewirkte eine Zunahme der thermischen Stabilität, des E-Moduls und der Wasseraufnahme sowie eine Abnahme der Zugfestigkeit, der Bruchdehnung, der Schlagzähigkeit gekerbter Probekörper und der Lichtdurchlässigkeit. Die Trübung nahm bis zu einem NCM-Gehalt von 15 Gew.-% nur geringfügig zu.
    Notes: Copolymers of methyl methacrylate (MMA) and N-cyclohexyl maleimide (NCM) with low intrinsic viscosity were obtained when free-radical copolymerization was carried out in benzene solution. Copolymers containing 0-30 wt.-% NCM were also prepared by bulk polymerization as cast acrylic sheets and had much higher intrinsic viscosity. An increase in NCM content in copolymers resulted in an increase in thermal stability and modulues and a decrease in tensile strength, strain at break, impact strength of unnotched specimen and light transmittance. The increase in haze was marginal up to 15 wt.-% of NCM. A decrease in water absorption was observed with an increase in NCM content.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052210101
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of a methylmethacrylate-butadiene-styrene modifier on the dynamics of the viscoelastic beta process in poly(vinyl chloride) (1990)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 28 (1990), S. 1987-2005 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The viscoelastic properties of a methylmethacrylate-butadiene-styrene (MBS) modifier over the temperature range -140 to 20°C and frequency range 0.01592 (0.1 Rad/s) to 79.62 Hz (500 Rad/s) is represented in terms of a relaxation function proposed by Havriliak and Shortridge to represent the viscoelastic beta process of MBS-modified and unmodified poly(vinyl chloride) (PVC). The parameters of the expression as well as their temperature dependence were determined from the multiresponse methods developed by Havriliak and Watts. The complex modulus of PVC/MBS modifier blends at 8.26, 10.71, and 13.04 wt % modifier, over a temperature range -140-20°C, and at a frequency of 1 Hz can be represented, nearly within experimental error, in terms of the complex modulus of the neat components, the volume fraction of the modifier, and the blend equations of Uemura and Takayanagi. The small but persistent deviations that are observed are discussed in terms of hydrostatic stresses due to differential coefficients of expansion.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1990.090281109
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of density changes with expansion polymerizationThis investigation was supported in part by funds provided to the University of Missouri-Kansas City School of Dentistry by a USPHS Research Grant DE-08450 from the National In-stitute of Dental Research, Bethesda, MD 20892. (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 729-733 
    Details
    ISSN: 0887-6266
    Keywords: density change determination for polymerizations with minimal volume change ; spiro-orthocarbonates, expansion polymerization density change determination for ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Materials that polymerize without substantial volume contraction have numerous valuable applications in dentistry and other fields. Two new symmetrical aliphatic spiro-orthocar-bonates, formulated from cis- and trans-2-hydroxymethyl-cyclohexanol to give 2,3,8,9-di(tetramethylene)-1,5,7,11-tetraoxaspiro [5,5] undecanes, showed, by density determinations in dilute solution, that expansion occurs with polymerization. The cis / cis-spiroorthocarbonate racemic mixture showed a 3.9% expansion upon polymerization, and the trans/trans racemic mixture showed a 3.5% expansion. The densities were determined by pycnometry, with a precision reliable to at least four figures. This method is thus recommended for cases of soluble monomer/polymer pairs for which the density difference will be small and where the partial specific volumes are independent of concentration, thereby avoiding the complexities of variable physical states of monomer and/or polymer. © 1993 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090310613
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