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  • Polymer and Materials Science  (21)
  • 1
    Electronic Resource
    Electronic Resource
    Vibrational spectrum of the unordered polypeptide chain: A Raman study of feather keratin (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1513-1528 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Raman spectra of native and solubilized feather keratin have been obtained, and the amide I and amide III regions have been analyzed by band resolution techniques. The amide I region of the native form indicates that at least 64% of the protein has an antiparallel chain pleated sheet structure, the remainder being unordered. For the solubilized keratin all of the protein is in an unordered state. The amide III region is not as easily analyzed into component contributions. Normal vibration analyses on N-acetyl-L-alanine-N-methylamide support the conclusion that the amide III region is not as satisfactory as the amide I region in characterizing unordered structures. Even in the latter case caution must be used, since the observed amide I band is an average over the conformational distribution in the particular unordered system.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360150807
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  • 2
    Electronic Resource
    Electronic Resource
    Polyurethane ionomers. I. Structure-properties relationships of polyurethane ionomers (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 2467-2479 
    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 influence of chemical structure on mechanical properties of polyurethane ionomers (PU ionomers) has been examined. NCO-terminated prepolymers prepared from primarily 4,4-methylene bis(phenyl isocyanate) (MDI) and poly(oxytetramethylene) glycol (PTMO) were chain extended with tertiary amine-containing diols and the ionomers obtained by quaternization of the prepolymers. The N-methyldiethanolamine chain extender gave the best physical properties. The mechanical properties of the PU ionomers were improved with decreasing chain length of PTMO and with increasing concentration of quaternary ammonium centers (or NCO/OH ratio of PU prepolymers). A lower degree of quaternization resulted in a decrease in the mechanical properties of the resulting PU ionomers, but their properties could be improved by post-quaternization. The adhesion of the PU ionomers to aluminum and the glass transition temperature increased with increasing concentration of quaternizing centers.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290804
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  • 3
    Electronic Resource
    Electronic Resource
    Vibrational analysis of peptides, polypeptides, and proteins. XXI. β-Calcium-poly(L-glutamate) (1984)
    New York : Wiley-Blackwell
    Biopolymers 23 (1984), S. 1565-1594 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The observed Raman and ir spectra of Ca-poly(L-glutamate) in the β conformation have been analyzed by means of a normal mode calculation. The force field for the main chain was transferred without refinement from β-poly(L-alanine), yet it provides a good prediction of the observed bands and, in particular, explains subtle differences in the spectra of these two β-sheet structures. Main- and side-chain modes are well characterized, and the dependence of the amide III frequency on side-chain composition is again demonstrated.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360230811
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  • 4
    Electronic Resource
    Electronic Resource
    Structural changes and chain orientational behavior during tensile deformation of segmented polyurethanes (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 2085-2098 
    Details
    ISSN: 0887-6266
    Keywords: orientation ; polyurethane ; deformation ; orientation function ; hydrogen bond ; hard domain ; soft domain ; infrared dichroism ; relaxation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Structural changes and segmental orientation behavior of polyurethane have been studied during uniaxial deformation. The orientation function change of the two (free and hydrogen bonded C=O stretching peaks) peaks during a full cycle of deformation has been observed to be distinctively different. Even though the hydrogen-bonded C—O peaks showed hysteresis behavior, the free C—O peaks exhibited quite elastic behavior. It was thus concluded that the orientation behavior of free and hydrogen-bonded C—O stretching peak represents the deformation characteristics of soft and hard domains, respectively. The orientation behavior at different temperatures also has been studied. Temperature has a significant effect on the orientation behavior of the soft domain, whereas it has negligible effect on the hard domain orientation. It was also demonstrated that the structural change due to the deformation could be analyzed by infrared spectroscopy. Some of the hydrogen-bonded carbonyl groups have been observed to be transferred to the free carbonyl groups, indicating that a small amount of the hard segments in the hard domain have been pulled out into the soft matrix upon deformation. The orientational relaxation also has been studied as a function of time. The segmental relaxation of the hard segments appears to be quite characteristic depending on the nature of the domain in which they reside. © 1994 John Wiley & Sons, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090321215
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  • 5
    Electronic Resource
    Electronic Resource
    Spectroscopic study of a model composite: Compressive behavior of the reinforcement fiber and the buildup of thermal residual stress (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 27 (1989), S. 337-353 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The compressive behavior of polydiacetylene (PDA) single-crystal fiber and the buildup of thermal residual stress in PDA/epoxy model composite systems have been studied by Raman-mechanical spectroscopy. The compressive failure of the PDA fiber has been directly observed when the macroscopic compressive stress, applied during a bending experiment, exceeds a critical value. Fiber failure in model composites caused by thermal residual stress can also be observed by Raman measurements as well as optical microscopy. In fact, the most clear indication of fiber failure was the observation of kink bands formed. The thermal residual stress buildup which resulted from significant temperature changes in this model composite have also been studied. Contrary to most accepted views, our analysis showed the adhesion between the reinforcement fiber to the epoxy matrix to be strong.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1989.090270209
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  • 6
    Electronic Resource
    Electronic Resource
    Fourier-transform infrared study of the nematic order in thermotropic main-chain polyesters (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 827-837 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Infrared spectroscopy has been used to analyze the microstructures of liquid-crystalline polymers in various mesophases. It was quite evident that there is little indication of conformational order associated with the flexible polymethylene sequences in the nematic or isotropic phases. However, additional spectroscopic evidence does suggest that polyesters with an even number of methylene units have a higher degree of lateral order when compared to those with an odd number in the liquid-crystalline state.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.090240409
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  • 7
    Electronic Resource
    Electronic Resource
    Vibrational spectroscopic study of poly(ethylene terephthalate) crystallized by annealing in the oriented state (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 223-230 
    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: Poly(ethylene terephthalate) filament yarn has been annealed in nitrogen atmosphere, in silicone oil, or in nonreacting organic solvents. Morphological changes resulting from the annealing processes have been followed by Raman spectroscopy. Crystallinity, as evidenced by the width of the 1730 cm-1 carbonyl stretching vibration, is shown to affect the macroscopic properties of these filaments. Furthermore, these spectroscopic results, together with shrinkage measured, suggest that the shrinkage and the crystallization processes in the polymer fiber proceed at different rates in different fluid media.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070260121
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  • 8
    Electronic Resource
    Electronic Resource
    A Raman study of the phase transition in crystalline trans-1,4-polybutadiene (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 14 (1976), S. 521-529 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman spectroscopy has been used to analyze the characteristics of the crystal-crystal phase transition of trans-1,4-polybutadiene. The low- and high-temperature structures were found to coexist at the transition. The Raman spectra obtained at high temperature can be understood on the basis of the change in chain conformation associated with the phase transition.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.180140312
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  • 9
    Electronic Resource
    Electronic Resource
    Longitudinal acoustic mode in polymers. IV. LAM-3 of the general perturbed rod and applications to paraffins and polymers (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 2105-2114 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dependence of the LAM-3 frequency on the various parameters of a perturbed composite elastic rod has been calculated. Together with the previously calculated nonlinear variation of LAM-1 with these parameters, it can be expected that experimental measurements of both of these bands will permit a more detailed analysis of properties of long-chain molecules. The predictions of the theory are in complete agreement with experimental results on n-paraffins. For data on polyethylene and poly(ethylene oxide) reasonable solutions can be found, although the experimental information on polymers is not yet accurate enough or sufficiently devoid of assumptions to permit definitive conclusions to be reached.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180161202
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  • 10
    Electronic Resource
    Electronic Resource
    Longitudinal acoustic mode in polymers. II. Solution of the general composite perturbed elastic rod (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 15 (1977), S. 1769-1778 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The theory of the longitudinal vibrations of a composite rod with perturbing forces at the ends has been generalized by the inclusion of inertial effects at the ends of the rod. The frequencies have been calculated for both symmetric and asymmetric forces and masses. The problem of coupled rods has also been treated, and its relation to the isolated rod is shown. These results should be applicable to the study of longitudinal acoustic modes in long chain molecular systems.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.180151007
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