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  • 1980-1984  (8)
  • Polymer and Materials Science  (8)
  • (In vivo)
  • myelin basic protein
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Year
Keywords
  • Polymer and Materials Science  (8)
  • (In vivo)
  • myelin basic protein
  • Chemistry  (8)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 25 (1980), S. 2129-2132 
    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
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 1283-1298 
    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: Dehydrochlorinated poly(vinyl chloride)-g-polystyrene (DHPVC-g-PSt) prepared by free radical grafting was characterized, and some of its physical properties were evaluated. The presence of graft was established by the appearance of new absorption peaks in the IR spectra of the graft copolymer. GPC analysis showed increase in the average molecular weights of the graft copolymer upon increase in the PSt content. Besides, GPC revealed the uniform PSt distribution of DHPVC-g-PSt. A marked improvement in the thermal stability of DHPVC-g-PSt over that of DHPVC and DHPVC/PSt blends was observed. Graft copolymers with high percent grafting were thermally more stable than even the original PVC. Stress-strain data indicated decrease in yield stress, breaking stress and elongation, along with an increase in the initial modulus, upon increase in PSt content of the graft copolymer.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 1245-1254 
    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: Dehydrochlorinated poly(vinyl chloride) (DHPVC) was graft copolymerized with styrene monomer using benzoyl peroxide (Bz2O2) as free radical initiator, in vacuum. The effect of synthesis conditions such as time, initiator concentration, the ratio of monomer to polymer, and temperature on various grafting parameters was studied. On the whole, a maximum of 47 wt % polystyrene (PSt) in the graft (DHPVC-g-PSt) was obtained. PSt contents of graft copolymers determined by gravimetry, chlorine analysis, and UV spectroscopy have been compared. A “grafting from” mechanism has been proposed for the graft copolymerization.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 2125-2129 
    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
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 2217-2226 
    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: Nylon 6-g-polyacrylamide graft copolymer prepared by photoinduced initiation was characterized and some of its properties were evaluated. Intrinsic viscosity of the graft copolymer increased continously with percent grafting. Thermal stability decreased corresponding to the increase in add-on %. The moisture regain, diameter, and density showed an increase with percent grafting. The acid dyeability of the graft copolymer decreased with increase in graft level, whereas the disperse dye uptake increased initially up to a graft add-on of 28.9% and then showed a decrease.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 1327-1333 
    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: Nylon 6 fiber, grafted with various vinyl monomers, viz., methyl methacrylate (MMA), ethyl methacrylate (EMA), and n-butyl methacrylate (n-BMA) were evaluated for their tensile, dye uptake, moisture regain, and solubility characteristics and compared to those of the parent nylon 6 fiber. The tensile properties (tenacity and initial modules) of the grafted samples show a decreasing trend and the percentage breaking elongation an increasing trend with the increase in the graft level in the case of all the three monomers compared to parent nylon 6 fiber. Disperse dye uptake also shows a decrease with the increase in the graft level in all the three monomers grafted only onto nylon 6 fiber. With the introduction of hydrophobic groups in the polymer backbone the moisture regain values decrease. This is true for all the samples and follows the order MMA-g-nylon 〉 EMA-g-nylon 〉 n-BMA-g-nylon. Solubility of the polymer in the solvent orthochlorophenol (OCP) and metacresol (MC) also decreases with the increase in the graft level for all the three monomers used in the following manner: OCP: EMA-g-nylon 〉 n-BMA-g-nylon 〉 MMA-g-nylon; MC: n-BMA-g-nylon 〉 EMA-g-nylon 〉 MMA-g-nylon.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 112 (1983), S. 95-106 
    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 thermischen Eigenschaften von Methylmethacrylat (MMA), Ethylmethacrylat (EMA) und n-Butylmethacrylat (n-BMA), gepfropft auf Nylon 6 Fasern mit verschiedenen Pfropfgraden wurden durch Thermogravimetrie (TGA) und Differentialthermoanalyse (DTA) untersucht und die Ergebnisse mit denen von Nylon 6 Fasern verglichen. Es wurde gefunden, daß die Anfangsabbautemperatur (IDT) der gepfropften Proben geringer war als die von Nylon 6. Andererseits wurde die gesamte thermische Stabilität mit allen drei Monomeren größer, gefolgt von einer späteren Abnahme mit zunehmendem Pfropfgrad. Für die gepfropften Proben folgen IDT und IPDT (initial procedural decomposition temperature) der Reihe MMA-g-Nylon 〈 EMA-g-Nylon 〈 n-BMA-g-NylonDie Differentialthermoanalyse zeigt ein Absinken der Glastemperatur (Tg) sowie der Schmelztemperatur (Tm). Bei mit MMA und EMA gepfropften Proben ist das Absinken klein über einen weiten Bereich des Pfropfgrades. Bei n-BMA ist das Absinken stärker. Ein breiter Schmelzbereich wurde bei den gepfropften Proben gefunden. Untersuchungen über die Entflammbarkeit zeigten ebenfalls, daß mit zunehmendem Pfropfgrad und zunehmender Länge der Alkylkette die Leichtigkeit der Entflammbarkeit zunimmt, ausgedrückt durch den Sauerstoffindex. Die möglichen Gründe für diese Phänomene werden diskutiert.
    Notes: Thermal Properties of methyl methacrylate (MMA), ethyl methacrylate (EMA) and n-butyl methacrylate (n-BMA) grafted onto nylon 6 fibre with various graft levels were investigated by thermogravimetric analysis (TGA) and differential thermal analysis (DTA) and the results compared with that of parent nylon 6 fibre. It was found that the initial decomposition temperatures (IDT) of the grafted samples were lower than that of the parent nylon 6 fibre. On the other hand with all the three monomers, there was an increase in overall thermal stability followed by subsequent decrease with increase in the graft level. Among the grafted samples both the IDT and IPDT (initial procedural decomposition temperature) followed the order MMA-g nylon 〉 EMA-g nylon 〈 n-BMA-g nylonDifferential thermal analysis shows a depression in glass transition temperature (Tg) as well as in melting temperature (Tm). In the case of the MMA and EMA grafted samples, the depression is small over a wide range of graft level. In the case of the n-BMA grafted samples, the depression is higher. A wide melting range was obtained in the grafted samples. Flammability studies also showed that with an increase in the graft level as well as an increase in the alkyl chain the ease of flammability increased as expressed by limiting oxygen index (LOI) values. The possible reasons for the phenomena occurred have been discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 121 (1984), S. 195-208 
    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: Es wurden Proben von Nylon 6 Fasern, auf die Acrylmonomere wie Methylmethacrylat (MMA), Ethylmethacrylat (EMA) und n-Butylmethacrylat (n-BMA) mit unterschiedlichen Pfropfgraden aufgepfropft wurden, mit IR-Spektroskopie, Röntgenstreuung und Rasterelektronenmikroskopie untersucht. Dabei wurden die durch das Pfropfen entstandenen Änderungen im Vergleich zu den ungepfropften Nylon 6 Fasern ermittelt. Die IR-Spektren der rnit den verschiedenen Monomeren gepfropften Nylon 6 Fasern zeigen eine kleine Anderung in der Peakhohe. Die charakteristischen Peaks des ungepfropften Nylon 6 blieben bei den gepfropften Fasern mehr oder weni- ger erhalten. Ein Peak bei 1730 cm-' (Estergruppe) bestatigt, da13 das Polymere rnit dem Monomeren gepfropft worden ist.Die Daten der Rontgenstreuung an den gepfropften Proben zeigen einige bemer- kenswerte Veranderungen rnit dem Pfropfgrad, die von der Natur des gepfropften Monomeren abhangen. Der Kristallinitatsgrad variiert rnit dem Pfropfgrad. Zu Be- ginn des Pfropfens zeigt sich eine Abnahme beim Pfropfen rnit PMMA und eine Zu- nahme im Falle von PEMA und Pn-BMA.Bei hoheren Pfropfgraden (uber 50%) nimmt der Kristallinitatsgrad in allen drei Fallen ab. Der Orientierungsindex zeigte ein Ansteigen zu Beginn des Pfropfens bei rnit EMA und n-BMA gepfropftem Nylon 6 und fallt dann ab, wahrend er fur rnit MMA gepfropftes Nylon 6 kontinuierlich auch bei niedrigem Pfropfgrad abfallt.Die Untersuchungen der Oberflächencharakteristik bei den Ausgangs- und ge- pfropften Proben zeigen starke Änderungen der Oberfläche bei den verschiedenen Proben. Mit dem Ansteigen des Pfropfgrades nimmt der Durchmesser der Faser zu, und es erscheinen Poren und Risse an der Oberfläche.
    Notes: Samples of nylon 6 fibers grafted with the acrylic monomers methyl methacrylate (MMA), ethyl methacrylate (EMA), and n-butyl methacrylate (n-BMA) with various graft levels were investigated by infrared, X-ray and scanning electron microscopic studies and the changes due to grafting with respect to the parent nylon 6 fibers were studied.The IR spectra of grafted nylon 6 samples show that there is a little change in the peak heights by grafting of nylon 6 with various monomers. The characteristic peaks of parent nylon are, more or less, maintained in the case of grafted samples. A peak at 1730 cm-1 of the ester group was noted which confirms that the polymer has been grafted with the monomer.X-ray diffraction data on the grafted samples show some remarkable variations with the degree of grafting, depending upon the nature of the graft monomer. The percentage of crystallinity varies with the degree of grafting. In the initial stages of grafting it shows a decrease in the case of PMMA graft and an increase in the case of PEMA and Pn-BMA graft. At higher degrees of grafting (above 50% graft add-on) the percentage of crystallinity decreases in all the three cases. Orientation index has been found to increase in the initial stages of grafting in the case of EMA and n-BMA grafted nylon 6 and it decreases later on, whereas in the case of MMA graft it decreases continuously even at low graft level.The studies of surface characteristics for the parent and grafted samples show that spectacular changes on the surface of the various samples have taken place. With the increase in the graft level the diameter of the fiber increases and also the voids and cracks appear on the surface.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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