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  • Chemistry  (20,884)
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  • 1
    Unknown
    Computational Chemistry and Molecular Modeling : Principles and Applications (2008)
    Berlin, Heidelberg : Springer
    Details
    Keywords: Chemistry ; Chemistry, Physical organic ; Chemistry ; Mathematics
    ISBN: 9783540773047
    URL: https://doi.org/10.1007/978-3-540-77304-7
    Language: English
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    E-BOOK
  • 2
    Unknown
    Radiation Induced Molecular Phenomena in Nucleic Acids : A Comprehensive Theoretical and Experimental Analysis (2008)
    Dordrecht : Springer
    Details
    Keywords: Biochemistry ; Biology ; Data processing ; Biomedical engineering ; Chemistry ; Chemistry, Physical organic ; Materials
    ISBN: 9781402081842
    URL: https://doi.org/10.1007/978-1-4020-8184-2
    Language: English
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and I.R. Studies of the Complexes of Methylethyl-, EthyI(n-propyl)- and n-Propyl(n-butyl)tin Dichlorides with Some Nitrogen Donors (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 468 (1980), S. 231-234 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und IR-Untersuchungen der Komplexe von Methylethyl-, Ethyl(n-Propyl)-und n-Propyl (n-Butyl)zinn-dichloriden mit einigen StickstoffdonatorenEs wurden die Komplexe von Methylethylzinn-dichlorid mit 3-, 4-Picolinen, Isoquinolin und Benzylamin, von Ethyl(n-propyl)zinn-dichlorid mit Pyridin, 3-Picolin und Isoquinolin and von n-Propyl(n-butyl)zinn-dichlorid mit Isoquinolin, n-Propylamin and Benzylamin dargestellt und ihre Zusammensetzung aus dem Zinn- und Chlorgehalt bestimmt. IR-Messungen (4000-200 cm-1) weisen darauf hin, daß in allen hexakoordinierten Komplexen des Methylethyl-zinn-dichlorides die Chloratome in eis-Position stehen. Im Fall der hexakoordinierten Komplexe des Ethyl(n-propyl) und n-Propyl(n-butyl)zinn-dichlorides jedoch kann die mehrfache Aufspaltung der Zinn-Chlorvalenzbande auf dem Vorliegen von Konformationsisomeren beruhen. Leitfähigkeitsmessungen wurden zur Bestimmung des Ionencharakters ausgeführt.
    Notes: Complexes of methylethyltin dichloride with 3-, 4-picolines, isoquinoline and benzyl amine, of ethyl(n-propyl) tin dichloride with pyridine, 3-picoline and isoquinoline and of n-propyl (n-butyl)tin dichloride with isoquinoline, n-propyl amine and benzyl amine have been prepared and their stoichiometries established from their tin and chlorine contents. I.R. measurements (4000-200 cm-1) suggest that in all the hexa-coordinated complexes of methylethyltin dichloride, the chlorines are in cis-position. In case of hexa-coordinated complexes of ethyl(n-propyl)- and n-propyl (n-butyl) tin dichlorides, however, the multiple splitting of tin-chlorine stretching band may also be due to the presence of conformational isomers. The conductance measurements have also been carried out to determine their ionic character.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19804680130
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  • 4
    Electronic Resource
    Electronic Resource
    Studies on the polyblends of poly(vinyl chloride) with various methacrylate copolymers, physical and mechanical properties. I (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 1401-1419 
    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 effect of blending various methacrylate copolymers on the physical and mechanical properties of poly(vinyl chloride) (PVC) has been investigated. Copolymers of methylmethacrylate with methylacrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate in 80:20 and 50:50 wit methylmethacrylate have been prepared and characterized by nuclear magnetic resonance spectroscopy. Polyblends of PVC and such polyacrylates have been prepared in 80:20 ratio by melt blending technique and characterized by thermomechanical analysis to study the glass transition behavior vis-à-vis the compatibility of these blends. Mechanical properties of these blends revealed a substantial increase in impact strength particularly when long chain acrylate polymers like butyl acrylate and 2-ethyl hexyl acrylates are used; however, there is a decrease in the yield stress and initial modulus. A shift from brittle failure to ductility has been observed in blends of PVC on incorporation of these acrylate copolymers. Scanning electron microscopic studies have been carried out to support these observations.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070380801
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on the polyblends of poly(vinyl chloride) with various methacrylate copolymers, melt rheological properties. II (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 1421-1437 
    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: Studies have been made on the melt rheological properties of poly(vinyl chloride) (PVC) with copolymers of methyl methacrylate (MMA) and methyl acrylate (MA), ethyl acrylate (EA), butyl acrylate (BA), and 2-ethyl hexyl acrylate (EHA) at a blending ratio of 80:20. Effect of blend composition on shear stress-shear rate, melt viscosity, melt elasticity, and extrudate distortion have been studied. A significant decrease in the melt viscosity is observed on incorporation of low Tg, acrylate copolymers such as those with BA and EHA, thereby reducing the processing temperature. First normal stress and die swell ratio also decreases with an increase in the side chains of acrylate copolymer. PVC blended with P(MMA-co-BA) and P(MMA-co-EHA) is sensitive to both temperature and shear stress.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070380802
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and I. R. studies of Ethyl(n-Propyl)Tin Dichloride and its Adducts with Nitrogen Donors (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 445 (1978), S. 242-244 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Äthyl(n-Propyl)-Zinndichlorid und seine Addukte mit Stickstoff-DonatorenÄthyl(n-Propyl)-Zinndichlorid wurde nach der Methode der Umverteilung dargestellt. Mit Phenylhydrazin, Anilin, Piperidin, n-Propylamin und n-Butylamin bildet es 1:2-Addukte, mit Benzylamin nur ein 1:1-Addukt. Die IR-Spektren der Verbindung und der Komplexe werden mitgeteilt.
    Notes: Preparation of ethyl(n-propyl)tin dichloride by the redistribution-reaction method has been reported. It has been found to form 1:2 adducts with phenyl hydrazine, aniline, piperidine, n-propyl- and n-butylamines while with benzyl amine only 1:1 adduct is obtained. IR spectra of EtPRnSnCl2 and its complexes have been discussed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784450131
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  • 7
    Electronic Resource
    Electronic Resource
    Thermally stimulated depolarization studies of cellulose nitrate (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 16-18 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die thermisch stimulierte Depolarisation von Cellulosenitrat wurde in Abhängigkeit von der Polarisierungsspannung, der Polarisierungstemperatur, der Aufheizgeschwindigkeit und der Lagerzeit gemessen. Ein Maximum, das auf die polare Estergruppe zurückzuführen ist und dessen Höhe mit der Polarisierungsspannung zunimmt, wird bei etwa 50°C beobachtet. Das Maximum tritt bei niedrigen (≤90°C) und hohen (≥140°C) Polarisierungstemperaturen nicht auf. Im dazwischen liegenden Temperaturbereich nimmt der maximale Strom von 100 bis 120°C ab und steigt danach wieder an. Höhe und Temperaturlage des Maximums nehmen mit der steigenden Aufheizgeschwindigkeit zu und mit der Lagerzeit ab.
    Notes: Thermally stimulated depolarization of cellulose nitrate has been measured as a function of polarizing voltage, electret forming temperature, heating rate and storage time. A single peak due to polar side ester group is observed at approximately 50°C, whose magnitude increases with polarizing voltage. The peak is absent for low (≤90°C) and high (≥140°C) electret forming temperatures. In the intermediate temperature range the value of the peak current decreases with the forming temperature from 100 to 120°C and then increases. The magnitude of the peak current and the peak temperature increase with heating rate and decrease with storage time.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340104
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  • 8
    Electronic Resource
    Electronic Resource
    Structure and physical properties of grafted jute fiber (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 55 (1995), S. 543-547 
    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: Jute fiber was grafted by acrylonitrile and methylmethacrylate monomers in raw and bleached condition. It was also noted that optimum grafting takes place after about 4 h of grafting. It was also noted that in bleached jute fiber, the grafting percentage is higher at all stages of grafting but the tenacity value at the highest add-on is practically the same as that of raw fiber with much less add-on. The crystalline orientation of the grafted jute fiber was correlated with the fiber tenacity. The moisture regain (%) of the fiber after grafting showed a decreasing trend with an increase in grafting percentage. No structural change of the fiber occurred due to grafting. © 1995 John Wiley & Sons, Inc.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070550401
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  • 9
    Electronic Resource
    Electronic Resource
    Non-rubber modified impact polystyrene by suspension polymerization: Bench scale studies (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 61 (1996), S. 1-7 
    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: Polystyrene (PS) homopolymer is transparent but has low impact strength. High impact PS (HIPS), made by grafting on elastomer, has good impact strength but is not transparent. The operating parameters, namely, polymerization temperature and initiator concentration, during styrene homopolymerization (in suspension) can be modified such that 5-10% of benzene-insoluble PS gel is formed that remains dispersed as very fine to small discrete particles in the continuous PS phase. The resulting polymer retains transparency and impact properties comparable to those of HIPS. © 1996 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of electron beam radiation on structural changes of trimethylol propane trimethacrylate, ethylene vinyl acetate, and their blends (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 60 (1996), S. 1329-1341 
    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 effect of electron beam irradiation at different radiation doses (2, 5, 10, 15, and 20 Mrad) on trimethylol propane trimethacrylol propane trimethacrylate (TMPTMA), ethylene vinyl acetate (EVA, 12% vinyl acetate content), and their blends (0.5, 1, 1.5, 2, 2.5, 3, and 5 parts/100 parts EVA) was investigated. An IR study showed some residual unsaturations retained in irradiated pure TMPTMA, while in blends all unsaturations were used up at a very early stage of irradiation. The concentration of the carbonyl group due to air oxidation increased in pure EVA and blends, but it reached a maximum at the 1.5-part TMPTMA level and 5-Mrad dose. some ether linkages were formed during irradiation in pure EVA and the blends, although in pure EVA the concentration of ether linkages reached a maximum at the 2-Mrad dose and then decreased and in the blends it increased with an increase in radiation dose. Gel content showed an increasing trend with an increase in radiation dose, but it increased marginally with TMPTMA level. A blend of EVA with 1 part TMPTMA produced more gel than pure EVA at the same irradiation dose. © 1996 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
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