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  • 1
    Electronic Resource
    Electronic Resource
    Mechanism of enhancement of conductivity for pyrolyzed polypyrrolone film at high temperature (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 1567-1572 
    Details
    ISSN: 0887-624X
    Keywords: pyrolysis ; polypyrrolone film ; electrical conductivity ; carbonization ; graphitization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effects of the pyrolytic temperature on the structure of the pyrolyzed polypyrrolone (PMDA-DAB) films were investigated. The structure of pyrolyzed PMDA-DAB film was characterized by elemental analysis, XPS spectra, x-ray diffraction, and SEM images. It suggests that the pyrolysis process of PMDA-DAB films consists of carbonization and graphitization processes, and the transitional temperature is at ca. 800°C. During carbonization process (Tp 〈 800°C), most oxygen is removed and the enhancement of conductivity with the pyrolytic temperature may be due to an extended conjugation of π-electron orbitals resulting in an increase of the number of charge carriers. During graphitization (Tp 〉 800°C), both oxygen and hydrogen are removed completely, and an increase in the mobility of charge carriers may increase conductivity with pyrolytic temperature. A graphite-like structure with heterocyclic rings containing nitrogen atoms is proposed for the PMDA-DAB film pyrolyzed at 1200°C. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and properties of polyimides containing 2,2′-bipyridine derivatives (1997)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 198 (1997), S. 833-841 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A series of polyimides containing 2,2′-bipyridine, 7, were synthesized by reaction of 4,4′-diamino-2,2′-bipyridine (4) with various aromatic dianhydrides, followed by imidization upon heating. These polyimides are fairly thermostable, and 5% weight loss occurs in the range of 484°C-580°C. The glass transition temperatures are between 276°C and 313°C. Their poly(amic acids) 6 can be partially quaternized using 1,2-dibromoethane and then easily imidized upon heating. The temperature of quaternized polyimides at which 5% weight loss is observed is around 300°C, the glass transition temperatures range from 202-239°C. These quaternized polyimides can also develop color under UV irradiation in a poly(N-vinyl-2-pyrrolidone) (PVP) matrix with maximum absorption at 800 nm. The bipyridine-based poly(amic acids) 6 can trap various metal ions from solution and then can be imidized by heating. The XPS data indicate the formation of a 1:1 (bipyridine: metal molar ratio) complex and a 2:1 complex. The temperature at which for the polyimide-metal complexes 5% weight loss is observed is around 300°C. Both the poly(amic acid)-metal complex and the polyimide-metal complex catalyze the condensation of benzaldehyde with acetophenone, with yields of chalcone of ca. 6.7-31.7%. The order of catalytic activity for different metal ions is Zn(II) 〉 Co(II) 〉 Cu(II).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1997.021980314
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and properties of polybenzimidazobenzophenanthrolines (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 1561-1565 
    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: Polycondensation of 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA) with 3,3′-diaminobenzidine (DAB) and 3,3′4,4′-tetraaminodiphenyl ether (TADPE), respectively, in N,N′-dimethylacetamide (DMAc) at room temperature was found to produce high-viscosity polybenzimidazobenzophenanthroline (PBIPA) precursors. The PBIPA films, exhibiting excellent thermal and mechanical properties, were conveniently prepared by the heat cure of precursors. UV-vis spectra and IR spectra of PBIPA were measured. The permeability to H2, O2, and N2 of these two polymer membranes was determined at 30°C and 1 atm. © 1995 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580919
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  • 4
    Electronic Resource
    Electronic Resource
    Silicon-containing polypyrrolone for gas-separation applicationProject supported by National Natural Science Foundation of China. (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 855-861 
    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 permeability to H2, O2, and N2 of silicon-containing polypyrrolone (SiDA-OTA) and three silicon-containing polypyrrolone random copolymers was determined at 30°C and 1 atm. The SiDA-OTA shows simultaneously increased permeability and permselectivity over the analogous polyimide (SiDA-ODA). The substitution of SiDA for the BPDA moiety in a polypyrrolone appears to result in a significant increase in gas permeability. The random copolymers contain different amounts of SiDA and DODA, which show lower permeability and higher permeselectivity than does SiDA-OTA. Wide-angle X-ray diffraction measurements of the mean intersegmental distance of the materials characterized the packing of different polymer types. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070510508
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  • 5
    Electronic Resource
    Electronic Resource
    Structure/permeability relationships of polyamide-imides (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 54 (1994), S. 1965-1970 
    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: Structure/permeability correlations for a family of aromatic polyamide-imides are presented. The variations in chemical structure lead to significant changes in permeability. The crystallization of PAP results in a very low permeability. The introduction of bulky group tends to increase permeability without a corresponding decrease in permselectivity. This result contributes to the inhibition of chain packing and segmental mobility. Wide-angle X-ray diffraction measurements of average segmental spacing of the materials and fractional free volume calculations characterize the packing of the different polymers. © 1994 John Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070541219
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  • 6
    Electronic Resource
    Electronic Resource
    Gas permeability of polyimides and polypyrrolone derived from 2,2′-bis(p-trimellitoxyphenyl)hexafluoropropane dianhydride (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 59 (1996), S. 1315-1320 
    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 permeability coefficients for H2, O2, and N2 in four polyimides and one polypyrrolone based on 2,2′-bis(p-trimellitoxyphenyl)hexafluoropropane dianhydride were determined at 30°C and 1 atm. Systematic variations in chemical structure were found to lead to significant changes in permeabilities and selectivities. The relationship between the chemical structure of the polymers, some of their physical properties (d-spa+ing, fractional free volume), and their gas permeability behavior are discussed. Introduction of 2 flexible segments tends to increase permeability but decrease selectivity. Structural moieties, which simultaneously inhibit chain packing and intrasegmental mobility, may increase permeability while maintaining selectivity. Temperature dependency of gas permeabilities was also reported for polypyrrolone. © 1996 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
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  • 7
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    Electrical properties and structure characterizations of pyrolyzed polypyrrolone (1997)
    Elsevier
    Details
    Publication Date: 1997-09-01
    Print ISSN: 0379-6779
    Electronic ISSN: 1879-3290
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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  • 8
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    Electrical property of pyrolyzed polypyrrolone film at high temperature (1995)
    Elsevier
    Details
    Publication Date: 1995-12-01
    Print ISSN: 0379-6779
    Electronic ISSN: 1879-3290
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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  • 9
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    Structural characterizations and electrical properties of pyrolyzed polyimide containing silicon in the main chain (2002)
    Elsevier
    Details
    Publication Date: 2002-02-01
    Print ISSN: 0379-6779
    Electronic ISSN: 1879-3290
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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  • 10
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    One-Pot Assembly of Microfibrillated Cellulose Reinforced PVA–Borax Hydrogels with Self-Healing and pH-Responsive Properties (2016)
    American Chemical Society (ACS)
    Details
    Publication Date: 2016-12-07
    Description: ACS Sustainable Chemistry & Engineering DOI: 10.1021/acssuschemeng.6b02279
    Electronic ISSN: 2168-0485
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by American Chemical Society (ACS)
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