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  • 1
    Digitale Medien
    Digitale Medien
    Structure-property relationship of polyurethane ionomer (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 956-961 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Polyurethaneionomer ; DMPA ; neutralization ; mechanicalproperties ; viscoelasticproperties
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract Polyurethane (PU) ionomers were prepared using various types of polyol (PTAd, PCL, PTMG, and PPG) and isocyanate (MDI, HDI, and IPDI), together with different extender (DMPA) contents, degree of neutralization, and number average molecular weight (M n) of polyol. Modulus (E′), strength (σb), and glass transition temperature (T g) significantly increased with the increased amount of extender and extender neutralization. Among three of the iocyanate used, PU from MDI gave the highest modulus, strength, andT g. With regard to theM n of PTAd (600, 1000, 2000), PU from PTAd 600M n gave the highest modulus, strength, andT g, due probably to the highest hard segment content and phase mixing. On the other hand, PU from PTAd 2000M n gave significantly improved strength over PTAd 1000M n, and the highest elongation. The results were interpreted in terms of soft-segment crystallization, and soft-hard phase separation, which was concluded from the lowered softT g.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00655964
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  • 2
    Digitale Medien
    Digitale Medien
    Miscibility of poly(styrene-co-acrylonitrile) with random copolymers of tetramethyl bisphenol-A polyarylate and tetrabromo bisphenol-A polyarylate (1994)
    Springer
    Polymer bulletin 33 (1994), S. 237-239 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Tetramethyl bisphenol-A polyarylate (TMPAR) was miscible with poly(styrene-coacryloni trile) 's(SANs) containing 4, 7, 10, and 13wt% of acrylonitrile(AN) repeating unit. As the content of tetrabromo bisphenol-A polyarylate(TBPAR) repeating unit in the random copolymer of TMPAR and TBPAR was increased, the miscibility window in the blends with SANs was narrowed. The intramolecular repulsion between styrene and AN repeating units in SAN was suggested to be the main driving force for the miscibility of SANs with the random copolymers of TMPAR and TBPAR.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00297361
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  • 3
    Digitale Medien
    Digitale Medien
    Multi-block copolymer dispersions through polyurethane macroiniferters (1998)
    Springer
    Polymer bulletin 40 (1998), S. 675-681 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Summary Tetraphenylethane-based polyurethane macroiniferter has been used to prepare polyurethane-polymethacrylic acid multi-block copolymers. These block copolymers have been converted into corresponding anionomers by treating them with triethylamine. Dispersions have been prepared by adding water into dimethylformamide solutions of block copolymers and their anionomers. Particle size and viscosity of the dispersions have been determined. The films obtained from the dispersions have been characterized by mechanical and dynamic mechanical analyses.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002890050307
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  • 4
    Digitale Medien
    Digitale Medien
    Shape memory polyurethane containing amorphous reversible phase (2000)
    Springer
    Journal of materials science 35 (2000), S. 1579-1583 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Segmented thermoplastic polyurethanes (TPUs), which consist of an amorphous soft segment from 1,3-butanediol and hexamethylene diisocyanate (HDI) and a crystalline hard segment from 4,4′-bis-(6-hydroxy hexoxy)biphenyl and tolylene 2,4-diisocyanate were synthesized. Their thermal and mechanical properties, shape memory effect, utilizing amorphous soft segment domain as reversible phase and crystalline hard segment domain as frozen phase, were examined. The reversibility observed on repeated deformation was improved as the magnitude of deformation was reduced and the hard segment content was increased, or by crosslinking with excess HDI.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004761206709
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  • 5
    Digitale Medien
    Digitale Medien
    Characterization of ultra low density polyethylenes (PE-ULD) (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 91-101 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: In der vorliegenden Arbeit wurden die strukturellen, thermischen, rheologischen und molekularen Eigenschaften von Polyethylen ultraniedriger Dichte (PE-ULD) untersucht. Da PE-ULD hauptsächlich als Modifikator von anderen Polyolefinen verwendet wird, wurde das rheologische Verhalten besonders ausführlich untersucht.
    Notizen: Ultra low density polyethylene (PE-ULD), the newest and most recently commercialized member of polyethylene family, has been characterized in terms of structure, thermal and rheological properties, and molecular parameters. Since the prime use of PE-ULD is polyolefin modifier, emphasis is put on the melt rheology of the samples to provide data base for blending with other resins.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1992.051940108
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  • 6
    Digitale Medien
    Digitale Medien
    Copolymer composition-dependent light transmission of polymer/liquid crystals composite films (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 55-64 
    Details
    ISSN: 0887-6266
    Schlagwort(e): PDLC ; polarization ; angular discrimination ; copolymer ; Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Electrooptic responses (voltage and angular-dependent transmittance) of polymer/liquid crystal composite films with H, V, and unpolarized lights have been studied based on a nematic liquid crystal (Ro-5921) and four types of homopolymers and copolymers from ethyl methacrylate and styrene with different compositions. In this way, the index ratio of the polymer (np) to the ordinary refractive index of liquid crystal (no)(np/no) has been varied systematically, and the effect of the index ratio on viewing angle, applied voltage, response times, and transient response have been investigated. With increasing styrene content in the copolymer, droplet size increased, threshold (Vth) and saturation (Vsat) voltage, and rise time decreased. With np ≲ no, maximum transmittance occurred at normal incidence, regardless of the type of polarization. On the contrary with np 〉 no, V-polarization gave a peak in the transmittance-voltage curve, and transmittance overshot upon removal of the field, and these were interpreted in terms of effective refractive index and two-step relaxations. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 55-64, 1998
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Aqueous dispersion of polyurethanes from H12MDI, PTAd/PPG, and DMPA: Particle size of dispersion and physical properties of emulsion cast films (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 393-398 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Aqueous dispersions of ionic/nonionic polyurethane (PU) were prepared from hydrogenated diphenylemthane diisocyanate (H12MDI), poly(tetramethylene adipate) glycol (PTAd), polypropylene glycol (PPG), monofunctional ethylene-propylene oxide ether, and dimethylol propionic acid (DMPA). The effects of DMPA, PTAd/PPG ratio, and the average molecular weight of PPG on the state of dispersion, mechanical, and viscoelastic properties of the emulsion cast films were determined using Authosizer, Instron, and Rheovibron.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1991.070430218
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  • 8
    Digitale Medien
    Digitale Medien
    Melt rheology of poly(ethylene terephthalate), polyarylate, and their blends (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 40 (1990), S. 1805-1818 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Rheological properties of two polyesters; poly(ethylene terephthalate) (PET) and bisphenol A-50/50 isophthalic/terephthalic acid based polyarylate (PAR), and their 85/15, 50/50, and 30/70 (PET/PAR) blends were investigated using a RDS rheometer, 290-310°C. Measurements included complex viscosity and modulus. Activation energy for flow and relaxation spectrum were subsequently calculated. Results indicated that PET/PAR blends are rheologically incompatible, i.e., zero-shear viscosities of the blends showed a negative deviation from the averages of the two homopolymers with a sharp minimum at 85/15 composition. The relaxation spectrum for 85/15 blend also showed a relaxation plateau, a characteristic of rigid particle suspension. The morphology of the polymer blends was examined from cryogenically fractured and etched surface using a scanning electron microscopy (SEM). Morphological observation indicated that PAR-rich phases, order of 0.1μm, were finely dispersed in PET phase for 85/15 blend, whereas the dispersion of PET phase in PAR-rich phase was in spherical form, order of 0.5μm in diameter, for the 50/50 blend.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1990.070401101
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  • 9
    Digitale Medien
    Digitale Medien
    IPDI-based polyurethane ionomer dispersions: Effects of ionic, nonionic hydrophilic segments, and extender on particle size and physical properties of emulsion cast film (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 2295-2301 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Isophoron diisocyanate (IPDI) -based polyester polyurethane (PU) dispersion in water was prepared in a prepolymer mixing process. Dimethylol propionic acid (DMPA), triethylamine (TEA), and triethyl tetramine (TETA) were used, respectively, as potential anionic center, neutralizing agent, and chain extender in aqueous phase. The effects of DMPA, butanediol (BD), and nonionic hydrophilic segment, viz. monofunctional ethylene-propylene oxide ether polyol, on the particle size of dispersion and the mechanical and viscoelastic properties of the emulsion cast films were systematically analyzed.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1991.070431219
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  • 10
    Digitale Medien
    Digitale Medien
    Reactive melt blends of nylon with poly(styrene-co-maleic anhydride) (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 43 (1991), S. 357-363 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Melt blends of nylon with poly(styrene-co-maleic anhydride) (SMA) were prepared in a twin-screw extruder. Viscoelastic properties of the melt and morphological, thermal, and mechanical properties of the blends were determined. Fourier-transform infrared (FTIR) spectroscopy measurement indicated reactions between nylon and SMA. Melting peak temperature (Tm) of nylon was not changed in blends. This, together with the FTIR results, assured that the reactions occur mainly with the free amide end groups of nylon. Melt viscosity, elasticity, and the heat-distortion temperature (HDT) of nylon was significantly increased with the addition of SMA. Tensile strength and impact strength of nylon were, respectively, in general, increased and decreased with SMA.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1991.070430214
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