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  • 1
    Electronic Resource
    Electronic Resource
    Ligand-exchange kinetics in methylatobis(dimethylglyoximato)cobalt(III) complexes (1969)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 91 (1969), S. 5188-5189 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01046a059
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Ligand-exchange kinetics in methylatobis(dimethylglyoximato)cobalt(III) complexes (1969)
    American Chemical Society
    Details
    Publication Date: 1969-08-01
    Print ISSN: 0002-7863
    Electronic ISSN: 1520-5126
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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    PAPER CURRENT
  • 3
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    Ultrahigh Molecular Weight Aromatic Siloxane Polymers (1983)
    In:  CASI
    Details
    Publication Date: 2014-09-11
    Description: Silphenylene-siloxane polymers can be prepared by a condensation reaction of a diol 1,4-bis(hydroxydimethylsilyl)benzene and a silane bis(dimethylamino)dimethylsilane. Using a stepwise condensation technique, a polymer (R=CH3) with a molecular weight in excess of 1.0 x 1 million has been produced. The polymer exhibits increased thermal stability, compared to a methyl siloxane polymer without the aromatic phenyl ring in the backbone. The use of bis(dimethylamino)methylvinylsilane should allow for ready crosslinking at the vinyl sites (R=-CH=CH2) introduced into the backbone. However, under the conditions of the reaction system a high molecular weight polymer was not obtained or the polymer underwent a crosslinking process during the synthesis.
    Keywords: NONMETALLIC MATERIALS
    Type: Alabama Univ. Res. Rept.: 1983 NASA(ASEE Summer Faculty Fellowship Program; 13 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Ultrahigh molecular weight aromatic siloxane polymers (1982)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The condensation of a diol with a silane in toluene yields a silphenylene-siloxane polymer. The reaction of stiochiometric amounts of the diol and silane produced products with molecular weights in the range 2.0 - 6.0 x 10 to the 5th power. The molecular weight of the product was greatly increased by a multistep technique. The methodology for synthesis of high molecular weight polymers using a two step procedure was refined. Polymers with weight average molecular weights in excess of 1.0 x 10 to the 6th power produced by this method. Two more reactive silanes, bis(pyrrolidinyl)dimethylsilane and bis(gamma butyrolactam)dimethylsilane, are compared with the dimethyleminodimethylsilane in ability to advance the molecular weight of the prepolymer. The polymers produced are characterized by intrinsic viscosity in tetrahydrofuran. Weight and number average molecular weights and polydispersity are determined by gel permeation chromatography.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA. Marshall Space Flight Center The 1982 NASA(ASEE Summer Fac. Fellowship Program; 13 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Ultra-high molecular weight silphenylene-siloxane polymers (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Silphenylene-siloxane copolymers with molecular weights above one million were prepared using a two stage polymerization technique. The technique was successfully scaled up to produce 50 grams of this high polymer in a single run. The reactive monomer approach was also investigated using the following aminosilanes: bis(dimethylamino)dimethylsilane, N,N-bis(pyrrolidinyl)dimethylsilane and N,N-bis(gamma-butyrolactam)dimethylsilane). Thermal analyses were performed in both air and nitrogen. The experimental polymers decomposed at 540 to 562 C, as opposed to 408 to 426 C for commercial silicones. Differential scanning calorimetry showed a glass transition (Tg) at -50 to -55 C for the silphenylene-siloxane copolymer while the commercial silicones had Tg's at -96 to -112 C.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TP-2295 , NAS 1.60:2295
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Ultra-High-Molecular-Weight Silphenylene/Siloxane Polymers (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Elastomers having molecular weights above 1 million made by twostage polymerization. Two-stage process proves far more successful than synthesis from reactive monomers. Process involves synthesis of silanolterminated prepolymer and subsequent extension of prepolymer chain with additional aminosilane monomer. Multistage method allows chain-extending monomer added in precise amounts between stages.
    Keywords: MATERIALS
    Type: MFS-27065 , NASA Tech Briefs (ISSN 0145-319X); 9; 4; P. 117
    Format: text
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    NASA TECHNICAL REPORTS
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