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  • 1
    Electronic Resource
    Electronic Resource
    Pervaporation of water-ethanol through poly(vinyl alcohol)/chitosan blend membrane (1992)
    Springer
    Polymer bulletin 29 (1992), S. 423-429 
    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 Blend membrane consisting of poly(vinyl alcohol)(PVA) and chitosan was prepared from solvent casting technique for effective separation of ethanol-water mixture by pervaporation. Selectivity toward water and the flux through the blend membrane, crosslinked with glutaraldehyde at the concention of 4×10-6 mol/g, were∼450 and 0.47 kg/m2.hr, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00944840
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  • 2
    Electronic Resource
    Electronic Resource
    Pervaporation of water/acetic acid through polyimide membranes from 3,3′, 4,4′-benzophenone tetracarboxylic dianhydride and 4,4′-oxydianiline (1992)
    Springer
    Polymer bulletin 29 (1992), S. 431-438 
    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 Pervaporation performance of polyimide (PI) membrane from 3,3′, 4,4′-benzophenone tetracarboxylic dianhydride (BTDA) and 4,4′-oxydianiline (ODA) was investigated at 80wt% feed acetic acid concentration and at 65°C. Imide contents in PI film were estimated by thermogravimetric analysis (TGA) method. The separation factor of PI membrane increases with the degree of imidization, while the flux was almost constant. The separation factor toward water through PI-94 membrane was about 417 with the flux of 47 g/m2. hr measured at 65°C and with 80wt% acetic acid as a feed. PI-94 showed the best pervaporation performance toward the separation of water from acetic acid solution among the PI membranes investigated. The swelling behaviors at various feed concenration were also examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00944841
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  • 3
    Electronic Resource
    Electronic Resource
    Separation of benzene/cyclohexane by pervaporation through chelate poly(vinyl alcohol)/poly(allyl amine) blend membrane (1994)
    Springer
    Polymer bulletin 33 (1994), S. 591-598 
    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 Chelate poly(vinyl alcohol)/poly(allyl amine) blend membrane was prepared and used for the separation of benzene/cyclohexane mixture by pervaporation processes. The coordination of benzene in the feed with cobalt in the membrane plays a major role in the separation of the mixture. Chelate poly(vinyl alcohol)/poly(allyl amine) blend membrane showed a preferential sorption toward benzene and was found to be more effective for permeating benzene in the benzene/cyclohexane mixture than an original Schiff base poly(vinyl alcohol)/poly(allyl amine) membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00296169
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  • 4
    Electronic Resource
    Electronic Resource
    Radiation-induced grafting of methylmethacrylate onto ultrahigh molecular weight polyethylene and its adhesive characteristics (2000)
    Springer
    Journal of materials science 11 (2000), S. 593-600 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The surface of ultrahigh molecular weight polyethylene (UHMWPE) was modified by radiation-grafting methylmethacrylate (MMA) in the presence of sulfuric acid and metallic salt to increase bonding strength with polymethylmethacrylate. The effect of the addition of metallic salts and sulfuric acid on the radiation grafting reaction was investigated when MMA was grafted to the irradiated UHMWPE. The adhesive characteristics with the grafting yield were investigated using conventional acrylic bone cement based on poly(methyl methacrylate) [PMMA]. The results showed that the inclusion of an $${\text{FeSO}}_{\text{4}} \cdot {\text{7H}}_{\text{2}} {\text{O}}$$ and sulfuric acid in MMA grafting solutions was extremely beneficial and led to a most unusual synergistic effect, while $${\text{CuSO}}_{\text{4}} \cdot 5{\text{H}}_{\text{2}} {\text{O}}$$ led to a detrimental effect. The tensile bonding strength between UHMWPE and PMMA sheet increased remarkably with an increased grafting yield on UHMWPE surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008988421660
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  • 5
    Electronic Resource
    Electronic Resource
    β-Chitin-based wound dressing containing silver sulfurdiazine (2000)
    Springer
    Journal of materials science 11 (2000), S. 817-823 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Physical and biological properties of some wound dressing materials based on β-chitin were studied. Water vapor transmission rates (WVTR), oxygen permeabilities and biodegradation kinetics were examined for film-type samples. WVTR of samples was in the range 2400–2800 g/m2/day. However, oxygen permeabilities of the samples were relatively low. To improve oxygen permeabilities, porous sponge-type wound dressing materials were prepared. In addition, these sponge-type samples contained antimicrobial agents, silver sulfadiazine (AgSD), in order to prevent bacteria infection on a wound surface. Anti-microbacterial tests on agar plate were carried out to confirm the bactericidal capacity of present materials. These materials impregnating AgSD had the complete bactericidal capacity against pseudomonas aeruginosa up to 7 days. Finally, a wound healing effect of β–chitin-based semi-interpenetrating polymer networks was evaluated from the animal test using the wistar rat in vivo. Histological studies confirm the proliferation of fibroblasts in the wound bed and a distinct reduction in infectious cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008961730929
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and surface characterization of heparin-immobilized polyetherurethanes (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 2331-2338 
    Details
    ISSN: 0887-624X
    Keywords: poly(ether urethane) ; surface modification ; heparin immobilization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Novel poly(ether urethanes) containing diester groups in the side chains (PU) were synthesized from 4,4′-diphenylmethyl diisocyanate, polytetramethylene glycol, and diethyl bis(hydroxymethyl)malonate as a chain extender. The surface modification of the PU film was carried out by a hydrolysis reaction, poly(ethylene oxide) (PEO) grafting, and heparin immobilization, and the surface-modified PUs were then characterized by attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, electron spectroscopy for chemical analysis (ESCA), and a contact angle goniometer. The concentration of carboxylic acid groups introduced on the PU surfaces as determined by the rhodamine interaction method was 61 nmol/cm2 when treated with 4N NaOH/methanol (1 : 2 v/v) for 30 min and subsequently with a citric acid-methanolic aqueous solution. The amounts of heparin coupled to the carboxyl groups on the PU surfaces and to the terminus amino groups on the PU-PEO were 0.92 and 0.84 μ g/cm2, respectively. There was almost no heparin released from the immobilized surface of a physiological solution for 100 h, thereby indicating the strong stability of immobilized heparin. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2331-2338, 1998
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Semi-interpenetrating polymer networks composed of β-chitin and poly(ethylene glycol) macromer (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 2285-2287 
    Details
    ISSN: 0887-624X
    Keywords: Semi-IPNs ; β-chitin ; hydrogel ; wet strength ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080331324
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamics of solvent diffusion in an aromatic polyimide (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 945-954 
    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: Diffusion behaviors of two polyimides (PIs) synthesized from 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA), 4,4′-oxydianiline (ODA), and 4,4′-diaminodiphenylsulfone (DDS) were investigated by the gravimetric method. The weight uptake of penetrants (solvents) was nearly proportional to the exposure time in solvent. This phenomenon was considered as the Case II diffusion (non-Fickian) mechanism. Two PI films had an affinity to N-methyl-2-pyrrolidinone (NMP) rather than to dimethylsulfoxide (DMSO). The solubility parameter differences between two polyimides and NMP are less than 5, whereas that between polyimides and DMSO are greater than 5, as calculated by Hoy's group contribution method. The solvent uptake of anisotropic films contributed to an increase in the thickness. The swollen amount of anisotropic films increased with the swelling temperature but tended to decrease with the imide content and the thickness of the anisotropic films. Isotropic films of two PIs did not swell in both NMP and DMSO. © 1994 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070510517
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  • 9
    Electronic Resource
    Electronic Resource
    Pervaporation of pyridine-water mixture through poly(acrylonitrile-co-4-styrene sulfonic acid) membrane (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 59 (1996), S. 227-233 
    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 modified polyacrylonitrile (PAN) membranes used in this study had sulfonic acid moiety to act as a specific functional group for the dehydration of pyridine aqueous solution. The in situ complex formed between pyridine in the feed and sulfonic acid moiety in the membrane could enhance the dehydration capacity of the modified PAN membranes. It was found that the pervaporation patterns were closely related to the content of the sulfonic acid in the modified PAN membranes. The effective in situ complex membrane can be prepared by controlling the content of sulfonic acid in the membrane. The in situ complex membrane shows an increase of permeation flux with a slight decrease in separation factor as operating temperature increase. © 1996 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Swelling of thermosensitive interpenetrating polymer networks composed of poly(vinyl alcohol) and poly(acrylic acid) (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 61 (1996), S. 697-702 
    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 swelling behavior of interpenetrating polymer networks (IPNs) composed of poly(vinyl alcohol) (PVA) and poly(acrylic acid) (PAA) in water was studied. The PVA/PAA IPN gels were prepared by four synthetic methods. The swelling behaviors of these IPNs made by different methods were compared. The differences in swelling behaviors of samples are discussed on the basis of their structural and physical differences. © 1996 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
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