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  • 1
    Electronic Resource
    Electronic Resource
    A new lithium insertion compound (lithium,copper) tantalum oxide, (Li,Cu)TaO3, with the LiNbO3-type structure (1989)
    s.l. : American Chemical Society
    Inorganic chemistry 28 (1989), S. 3592-3595 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00317a038
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  • 2
    Electronic Resource
    Electronic Resource
    Chemiluminescence of polyethylene induced by UV irradiation (1992)
    Springer
    Polymer bulletin 29 (1992), S. 369-375 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The chemiluminescence (CL) of polyethylene (PE) film induced by UV irradiation was investigated. CL parameter, I0, which indicates the oxidation rate under UV irradiation was obtained from a kinetic analysis. The I0 was found to be valuable to evaluate the durability of PE films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00944833
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared dichroism of the methyl group for some ethylene/α-olefin copolymers (1981)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 2 (1981), S. 577-583 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1981.030020908
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  • 4
    Electronic Resource
    Electronic Resource
    Copolymerization of carbon dioxide and N-phenylethylenimine (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 12 (1974), S. 729-736 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copolymerizations of carbon dioxide and N-phenylethylenimine were carried out with the use of various catalysts and solvents. The infrared spectrum of the polymer produced showed the characteristic absorption peak at 1730-1735 cm-1 based on the urethane linkage.The content of the urethane linkage decreased in the following order: Mn(acac)2 ≈ MnCl24H2O 〉 Al(OBu)3 〉 Ti(OBu)4 〉 ZnCl2 ≫ BF3OEt2 = VCl3 = Mn(acac)3 = FeCl3 = CrCl3 · 6H2O = 0. The manganase (bivalent) catalyst in combination with n-hexane solvent was found to be the best system for the copolymerization, and this system received detailed study. Generally speaking, both the polymer yield and the content of the urethane linkage increased with increasing content of carbon dioxide in the feed as well as with increasing polymerization temperature. From the fractionation of polymer in methanol, it was found that the produced polymer is composed of both homopolymer of N-phenylethylenimine and copolymer of N-phenylethylenimine and carbon dioxide. The content of the urethane linkage of the copolymer thus fractionated was as high as about 80%.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.170120403
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  • 5
    Electronic Resource
    Electronic Resource
    Polymerization of propylene carbonate (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 15 (1977), S. 219-229 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polymerization of propylene carbonate was carried out at 120-180°C mainly with the use of diethylzinc catalyst. The polymer was a pale-yellow, viscous material of relatively low molecular weight (1000-4000). From the spectroscopic analysis of the polymer and its hydrolyzed product, the polymer was determined to have the structure where x ⋍ 0.50, y ⋍ 0.25, and z ⋍ 0.25. This strongly suggested that the polymerization of propylene carbonate proceeded via 2,7-dimethyl-1,4,6,9-tetraoxaspiro[4,4]nonane (DTN) as an intermediate compound. Hence, DTN was synthesized and polymerized with the use of diethylzinc catalyst. The structure of the polymer thus prepared coincided exactly with that of the polymer from propylene carbonate. From these, a plausible mechanism of the polymerization was developed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.170150120
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  • 6
    Electronic Resource
    Electronic Resource
    Study of deformation mechanism for linear low-density polyethylene (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 401-410 
    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 deformation mechanism for linear low-density polythylene (LLDPE) has been studied by electron microscopy, infrared spectroscopy, and pulsed nuclear magnetic resonance. Morphologically, the lamellae in the polar region of a spherulite are aligned in parallel to the drawing direction and then unfolded into microfibrils with drawing. The lamellae in the equatorial region are curved, corrugated, and unfolded partially. Actually, microfibrils are formed with transformation of both lamellae and some amorphous molecules throughout the drawing. Restraint of molecular mobility for the amorphous region increases with drawing, but mobility for the immobile region (lamellae and microfibrils) remains constant. Orientation of the trans-methylene sequences in amorphous regions proceeds with extension. These results can explain the changes of the s-s curve behavior.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070330211
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  • 7
    Electronic Resource
    Electronic Resource
    Copolymerization of carbon dioxide and some diene compounds (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 1907-1911 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760630
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of a polycarbonate directly from carbon dioxide, alkali metal diolates and α,ω-dihalo compounds (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 2379-2386 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A detailed study was carried out on the new synthesis of poly[oxycarbonyloxy-(1,4-cyclohexylene)oxycarbonyloxymethylen-1,4-phenylenemethylen] (3) from 4-bromomethylbenzyl bromide (1), dipotassium 1,4-cyclohexanediolate (2) and carbon dioxide by using a variety of crown ethers as catalysts, which has recently been found by the present authors. Crown ethers having an 18-member-ring showed the best catalytic property of the various crown ethers, and the reaction was conducted in various solvents at 40-120°C by using 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6 ether). A maximum yield with the highest molecular weight was obtained from the reaction at 100°C in dioxane solvent. In addition, as result of a kinetic study a plausible mechanism could be proposed. Similar reactions were also carried out with dipotassium and disodium 1,4-phenylenedimethanolate (6a, b) and dipotassium 4,4′-isopropylidenediphenolate (7) in place of 2.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021791004
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation of molecular orientation and conformational change upon drawing for various ethylene/1-butene copolymers by IR spectroscopy (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 787-795 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Infrared spectroscopy was used to investigate the molecular orientation and the conformational change upon drawing for various ethylene/1-butene copolymers in a wide range of crystallinity (0 ≤ Xc ≤ 85% ). The degree of crystalline orientation at constant draw ratio decreases with increasing crystallinity. The orientation function for the amorphous CH2 sequence in the trans conformation, f(am), was calculated assuming additivity for the orientation functions of the trans bands. f(am) increases with drawing in a characteristical way for the different materials and reaches a value higher than that of the amorphous gauche bands. Furthermore, it was found that f(am) is strongly dependent on crystallinity. The relative concentration of the amorphous CH2 sequences in the trans conformation increases at the expense of that of the gauche sequences. The transformation from gauche to trans in the amorphous phase occurs simultaneously with the orientation of the amorphous CH2 sequences.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850415
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  • 10
    Electronic Resource
    Electronic Resource
    Morphological study of melt-crystallized linear low-density polyethylene by transmission electron microscopy (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1501-1514 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The morphology of the lamellae in non-isothermally crystallized linear low-density polyethylene (LLDPE), conventional high-pressure low-density polyethylene (HP-LDPE), and a high-density polyethylene (HDPE) sample was investigated by transmission electron microscopy (TEM). LLDPE exhibits clearly two different types of lamellae, i.e., thick, long, and straight lamellae like those of HDPE, and thin, short, and curved lamellae which grow among the former ones. Also LLDPE shows the broadest distribution of the values for the lamella thickness among the three types of polyethylenes mentioned. The average lamella thickness decreases in the order HDPE 〉 LLDPE 〉 HP-LDPE. Fractions were used to study the effects of the kind and the degree of short chain branching (SCB) and of the molecular weight in the range from 4100 to 3,1·105. SCB has a predominant influence on the lamella thickness as well as on the shape, while the molecular weight does not largely affect lamella thickness but affects the shape of the lamellae. Further it was revealed from TEM observation that the isobutyl branch decreases lamella thickness more effectively than does the ethyl branch. This is in accordance with results from small-angle X-ray and differential scanning calorimetry measurements.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870619
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