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  • Polymer and Materials Science  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Novel tris(phosphinates) of chromium(III) (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 6 (1968), S. 15-17 
    Details
    ISSN: 0449-2986
    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.1968.110060104
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  • 2
    Electronic Resource
    Electronic Resource
    Inorganic coordination polymers. X.Part IX of this series in Dahl and Block.1 Observations on the formation and nature of poly(di-μ-diphenylphosphinato-hydroxyaquochromium (III)),{Cr(H2O)(OH)-[OP(C6H5)2O]2}x (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 1397-1408 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Under different conditions two products, one green and one brown, were obtained by the air oxidation of chromium(II) diphenylphosphinate. Air oxidation of an aqueous suspension of the phosphinate apparently yields a mixture in which the green form predominates. As initially isolated, the green form is a low molecular weight polymer corresponding to {Cr(H2O)(OH)[OP(C6H5)2O]2}n, with n approximately 11. It spontaneously polymerizes further in organic solvents to high molecular weight polymers of the same composition, with n in the range 150-200. This polymerization reaction in volves the elimination of water and is probably a reaction between endgroups resulting in a basically linear polymer. The brown product, corresponding to low molecular weight {Cr2(H2O)(OH)2[OP(C6H5)2O]4}p, also polymerizes spontaneously but at a faster rate and to a gel. The polymer so produced is less soluble than that produced from the low molecular weight green product and is probably crosslinked.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.150060529
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  • 3
    Electronic Resource
    Electronic Resource
    Inorganic coordination polymers. XI. A new family of chromium(III) bis(phosphinate) polymers, [Cr(OH)(OPRR′O)2]xFor Part X of this series, see Maguire and Block.1 (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 3027-3038 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heating hydroxyaquochromium(III) bis(phosphinates) at temperatures up to 200°C under vacuum yields the corresponding anhydrous polymers [Cr(OH)(OPRR'O)2]x. The infrared and visible spectra and solution properties lead to the following conclusions. When R and R′ are phenyl groups, the hydroxyl groups appear to bridge between adjacent chromium atoms in the chain together with the phosphinate ligands to yield a linear, triple-bridged polymer. When at least one substituent on the phosphorus is an alkyl group, some of the hydroxyl groups crosslink between chains to yield less soluble polymers. Comparison of the properties of these new polymers with the parent polymers suggests that the latter should be formulated [Cr(H2O)n(OH)(OPRR′O)2]x·pH2O and that they contain more than one kind of monomer unit. The parent polymers can be readily prepared by a new method which involves reaction of a soluble chromium(III) salt with alkali metal phosphinates or of chromium(III) hydroxide with phosphinic acids in a water-tetrahydrofuran mixture.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150091022
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  • 4
    Electronic Resource
    Electronic Resource
    Inorganic coordination polymers. XII. Chromium(III) tris(phosphinates) (1973)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 11 (1973), S. 2691-2701 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cohesive films of a series of chromium(III) tris(phosphinates)[Cr(OPRR′O)(OPR″-R‴O)(OPR*R**O)]y in which the side groups on the phosphorus are alkyl, phenyl, and/or hydrogen groups have been prepared by reaction casting or by hot pressing. The preparative reaction appears to involve conversion of an aquahydroxo or hydroxo chromium(III) bis(phosphinate) to an intermediate hydroxo bis(phosphinate) containing coordinated phosphinic acid followed by an intrachain reaction leading to the tris(phosphinate). Tensile strengths of the chromium(III) tris(phosphinates) range from 100 to 5600 psi, elongations from less than 1 to 100%. Thermogravimetric data indicate that major decomposition occurs at temperatures from 200 to 435°C in air and from 410 to 510°C in nitrogen. Infrared spectra and physical properties are interpreted to support a structure for the chromium(III) tris(phosphinates) which is based on linear, triple-bridged chains. The presence of octyl or other long alkyl side groups on the phosphorus improves the physical properties, presumably by internal plasticization, but leads to decreased thermal stability.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1973.170111021
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  • 5
    Electronic Resource
    Electronic Resource
    Inorganic coordination polymers. XVIII. Observations on brittle and flexible films of {Cr[OP(CH3)(C6H5)O]2[OP(C8H17)2O]}xFor Part XVII of this series see Gillman.1 (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 2849-2856 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Films of {Cr[OP(CH3)(CH6H5)O]2[OP(C8H17)2O]}x, formed during the reaction of {Cr(OH)[OP(CH3)(C6H5)O]2}x with dioctylphosphinic acid, are either brittle or flexible depending on the details of the preparation of the chromium(III) bisphosphinate precursor. Both kinds of film appear to contain mainly triple-bridged chains. Differing degrees of randomness in distribution of the two kinds of phosphinate bridges and, hence, of the internally plasticizing octyl groups along the chain account for the observed differences in flexibility, x-ray diffraction patterns, and birefringence. The observed intrinsic viscosities of 9-18 dl/g indicate that these trisphosphinates form microgels rather than true solutions. The thermal degradation of these films proceeds by the oxidation and cleavage of the organic side groups. Addition of antioxidants to the flexible films significantly increases the longevity of their flexibility at 200°C.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170131220
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  • 6
    Electronic Resource
    Electronic Resource
    Inorganic coordination polymers. VII. Zinc(II) dimethyl-, methylphenyl-, and diphenylphosphinatesPresented in part at the 148th National Meeting of the American Chemical Society, Chicago, Ill., September 1964. (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 573-582 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zinc dimethyl-, methylphenyl-, and diphenylphosphinate have been prepared by the reaction of Zn(C2H3O2)2·2H2O with the appropriate acid or salt and found to exist in amorphous and crystalline forms. Zinc methylphenylphosphinate, the most tractable, exhibits many of the physical attributes of polymeric materials, both in solution and bulk form, supporting our earlier suggestion that these compounds are double-bridged coordination polymers. Thermogravimetric analysis indicates initial decomposition temperatures of 440, 425, and 490°C., respectively, for the three polymers, but long-term studies show initiation of decomposition at somewhat lower temperatures.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040311
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  • 7
    Electronic Resource
    Electronic Resource
    Inorganic coordination polymers. VIII. Cobalt(II) and zinc(II) phosphinate polymers and copolymersPresented in part at the 148th National Meeting of the American Chemical Society, Chicago, Ill., September 1964. (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 583-592 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The preparation, properties, x-ray powder patterns, and TGA curves are given for cobalt(II) dimethyl-, methylphenyl- and diphenylphosphinate. The polymeric character of cobalt(II) methylphenylphosphinate is demonstrated by its colligative properties and melt indexes. These cobalt(II) phosphinates along with hybrid copolymers of zinc(II) or cobalt(II) were prepared by the reaction of the metal acetate with the appropriate phosphinic acid or mixture of phosphinic acids. A consideration of the hybrid copolymers leads to the conclusion that both the zinc(II) and cobalt(II) dimethyl- and diphenylphosphinates are likewise polymeric. Thermal stability is discussed in terms of the structures suggested, and it is shown that crystallinity is related to polymer symmetry.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1966.150040312
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