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Polyethers derived from bisphenols and highly fluorinated aromatics (1992)

Irvin, Jennifer A. ; Neef, Charles J. ; Kane, Kevin M. ; [et al.]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 1675-1679

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ISSN: 0887-624X

Keywords: fluoropolymers ; low dielectric constant ; thermally stable ; aromatic polyethers ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: A series of fluorinated aromatic polyethers was synthesized via aromatic nucleophilic substitution of highly fluorinated aromatics (1,2,4,5-tetrafluorobenzene, hexafluorobenzene, and decafluorobiphenyl) with bisphenol AF or bisphenol A. Polymerization with 1,2,4,5-tetrafluorobenzene was not observed, and polymerization of hexafluorobenzene with bisphenol proceeded only if the potassium carbonate-bisphenol ratio was carefully controlled. The polymer condensed from decafluorobiphenyl and bisphenol AF was prepared in 77% yield with an inherent viscosity of 1.01 dL/g. The polymer prepared from the condensation of decafluorobiphenyl with bisphenol A was obtained in 48% yield with an inherent viscosity of 0.28 dL/g. These polymers were very soluble in common organic solvents, formed clear, colorless films, and were thermally stable (〉 450°C by TGA). The fully fluorinated polymer exhibited low water uptake (0.3%) and dielectric constant (2.17). © 1992 John Wiley & Sons, Inc.

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pola.1992.080300820

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Cyclopolymerization of 3-phenyl[5]ferrocenophane-1,5-dimethylene: Synthesis and electronic properties of a polyferrocenophane (1997)

Neef, Charles J. ; Glatzhofer, Daniel T. ; Nicholas, Kenneth M.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 3365-3376

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ISSN: 0887-624X

Keywords: cyclopolymerization ; ferrocenophane ; cyclophane polymer ; poly(vinylferrocene) ; non-conjugated conducting polymer ; polymer electrochemistry ; redox active polymer ; metallocene polymer ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Radical cyclopolymerization of 3-phenyl[5]ferrocenophane-1,5-dimethylene (2) and copolymerization with styrene gave polymers (3 and 4) with [3]ferrocenophane moieties pendant to the backbone. Cyclic voltammetry (CV) on polymer 3 in CH2Cl2 showed two oxidation waves at -0.13 and +0.05 V (versus ferrocene/ferrocenium) and CV on copolymer 4 showed one oxidation potential at -0.03 V. CV on 3 in dimethylacetamide showed only one oxidation potential at -0.10 V. Near-IR spectroscopy of partially oxidized 3 showed a broad intervalence band at ca. 2000 nm, indicative of low-energy barriers to electron hopping. Conductivity measurements on 3 and poly(vinylferrocene) (PVFc) oxidatively doped with iodine vapors under an argon atmosphere showed a maximum conductivity ca. 5 × 10-5 S/cm before the samples cracked, while 4 exhibited a maximum conductivity of 1.6 × 10-6 S/cm. On iodine doping under ambient conditions, polymers 3, 4, and PVFc showed maximum conductivities of 7.6 × 10-4, 9.5 × 10-5, and 5.5 × 10-5 S/cm, respectively. Conductivity measurement were also performed on samples of 3+BF4- with oxidation levels ranging from 8 to 56%. Conductivities of these samples ranged from ca. 10-10 to 10-9 S/cm under vacuum and ca. 10-6 S/cm under ambient conditions, indicating that atmospheric moisture has a strong effect on the conductivity. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 3365-3376, 1997

Additional Material: 4 Ill.

Type of Medium: Electronic Resource

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Synthesis of poly(benzylidene phthalide)s: A new class of polymers (1991)

Cassidy, Patrick E. ; Johnson, C. Greg ; Neef, Charles J. ; [et al.]

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 29 (1991), S. 1313-1317

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ISSN: 0887-624X

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Pyromellitic dianhydride (PMDA) was condensed with different aromatic diacetic acids via a Perkin reaction to produce new polymers containing the benzylidenephthalide group in the backbone. Yields ranged from 50 to 90% with inherent viscosities ranging from 0.07 to 0.37 dL/g. Polymerizations at 275°C for 4 h using p-phenylenediacetic acid and PMDA gave the polymer with highest inherent viscosity. However, polymerization under identical conditions of p,p′-diphenyl ether diacetic acid, each with PMDA, yielded poor results. For these two monomers the best polymerization conditions were 250°C for 8 h. In general, the most thermally stable polymer was derived from the diphenyl ether diacetic acid monomer (308°C). This polymer was obtained in highest yields and gave the greatest amount of pyrolytic residue in argon (67%).

Additional Material: 3 Tab.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pola.1991.080290910

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