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  • 1
    Electronic Resource
    Electronic Resource
    Phase transition in swollen gels. 2. Effect of charge concentration on the collapse and mechanical behavior of polyacrylamide networks (1982)
    s.l. : American Chemical Society
    Macromolecules 15 (1982), S. 782-788 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00231a019
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and elasticity of polyurethane networks. 5. Effect of diluent in the formation of model networks of poly(oxypropylene)triol and 4,4-methylenebis(phenyl isocyanate) (1986)
    s.l. : American Chemical Society
    Macromolecules 19 (1986), S. 2139-2146 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00162a006
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  • 3
    Electronic Resource
    Electronic Resource
    Phase transition in swollen gels. 6. Effect of aging on the extent of hydrolysis of aqueous polyacrylamide solutions and on the collapse of gels (1984)
    s.l. : American Chemical Society
    Macromolecules 17 (1984), S. 2868-2874 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00142a072
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal structure analysis of two crystalline bis(ω-hydroxyalkoxy)biphenyls using a combination of powder diffraction, IR spectroscopy and molecular simulation (1999)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 6 (1999), S. 1035-1043 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Synchrotron and standard X-ray powder diffraction (XRD) combined with IR spectroscopy and molecular simulations have been used to investigate the crystal structure of two crystalline mesogenic diols: 4,4′-bis(6-hydroxy-1-hexyloxy)biphenyl (D-I) and 4,4′-bis(11-hydroxy-1-undecyloxy)biphenyl (D-II). The crystal structure of D-I has been determined from high-resolution synchrotron powder-diffraction data collected at BM16 of the ESRF. The methods of grid search and Rietveld refinement have been used to determine this structure. The space group is Cc, with unit-cell parameters a = 44.392 (3), b = 7.221 (1), c = 6.631 (1) Å and β = 91.09 (1)°. The structure of D-II has a small degree of disorder. This structure was analyzed with a combination of experimental methods, conventional XRD, IR spectroscopy and molecular mechanics simulations, revealing the character of the structural disorder. Both the structures of D-I and D-II are lamellar-packed and layered. The hydrogen-bonding system between two adjacent layers in the structure of D-II is distorted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049599007840
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  • 5
    Electronic Resource
    Electronic Resource
    Network build-up by initiated polyreaction (1987)
    Springer
    Polymer bulletin 18 (1987), S. 209-215 
    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 The theoretical treatment of network formation in diamine-diepoxide curing under participation of etherification of excess epoxide groups, which is based on the combination of kinetic and statistical methods, has been extended to cover postgel parameters. Within the ring-free approximation, this treatment is rigorous. Relations have been derived for the extinction probabilities, sol fractions and concentrations of elastically active network chains. In the system under consideration, various definitions of an elastically active network chain are possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255112
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  • 6
    Electronic Resource
    Electronic Resource
    Swelling and photoelastic behaviour of ionized hydrogels of poly(acrylic acid) (1996)
    Springer
    Polymer bulletin 37 (1996), S. 791-798 
    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 The photoelastic and swelling behaviour of poly(acrylic acid) gels swollen in 1 M NaCl aqueous solution was studied as a function of crosslinking degree (1–5 wt.% ethylene glycol dimethacrylate) and degree of ionization αg = 0 − 1. The degree of swelling passes through a minimum at αg ≐ − 0.15 regardless of the degree of crosslinking, probably due to the formation of hydrogen bonds between ionized and nonionized carboxyl groups. In the same neutralization region, the equilibrium modulus reaches a maximum; on the other hand, the modulus related to the dry state is independent of α for all crosslinker concentrations. Thus the mechanical behaviour of poly(acrylic acid) gels is in accord with the Gaussian theory and no contribution of permanent physical interactions to the modulus is observed. The optical behaviour is more complex — the sign of the stress-optical coefficient C e changes three times with increasing α due to the orientation of the side groups. The analysis of the optical data shows that the C e value is controlled by the degree of swelling and by the ionization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00295779
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of composition on cooperative relaxation properties of random copolymers (1980)
    Springer
    Polymer bulletin 2 (1980), S. 25-30 
    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 The theory of ADAM and GIBBS (1965) has been extended to include a description of the composition dependences of relaxation times and of the glass transition temperature of a random copolymer using the known thermodynamic and viscoelastic parameters of homopolymers. Comparison with a number of copolymer systems shows that theoretical equations adequately correspond to experimental data if the sequence distribution effect is not operative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275549
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  • 8
    Electronic Resource
    Electronic Resource
    Phase transition in swollen gels (1989)
    Springer
    Polymer bulletin 22 (1989), S. 271-276 
    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 The dynamic mechanical behaviour of 4% aqueous solutions and networks of poly (N, N-diethylacrylamide) and copolymers of diethylacrylamide with sodium methacrylate (MNa) (molar ratio xMNA=0–0.05) swollen in water was measured in the temperature range 20–80 °C. With increasing temperature, at Tc polymer chains collapse from random coil to more compact globular conformations. While in the region of coil conformations (T 〉 Tc) the mechanical behaviour of solutions has a liquid-like character (the loss modulus G″ is higher than the storage modulus G′ for a constant frequency ω=1 Hz), in the region of globular conformations (T 〉 Tc) a heterogeneous physical network is built in solutions, and the mechanical behaviour has a solid-like character (G′ 〉 G″). In networks the collapse is reflected in an increase of storage modulus G′; the magnitude of this increase decreases with ionization. The dependence of the loss modulus G″ on the temperature of solutions and networks allows us to conclude that the magnitude of losses in the collapsed state is affected rather by xMNa (the modulus G″ increases with increasing ionization) than by the heterogeneous structure of the samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282852
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  • 9
    Electronic Resource
    Electronic Resource
    Phase transition in swollen gels (1990)
    Springer
    Polymer bulletin 23 (1990), S. 89-94 
    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 The DC conductivity of two networks — a poly(N,N-diethylacrylamide) network (N1) and a network prepared by the copolymerization of N,N-diethylacrylamide with 3 mol.% of sodium methacrylate (N2) — in deionized water in the temperature range 10–55°C was measured. While in the low-temperature range (expanded gel state) the volt-ampere (V-A) behaviour of both networks shows a semiconductive character (conductivity increases with increasing temperature), in the high-temperature range (collapsed gel state) the conductivity of the network N1 rapidly decreases with increasing temperature (metallic character). The presence of charges on the chain raises the conductivity and shifts the temperature of the change in conductivity to higher values. In the collapse region of the ionized network N2 anomalies were observed on the V-A characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00983969
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental evidence of the volume dependence of the deformational free energy of polymer networks (1979)
    Springer
    Polymer bulletin 1 (1979), S. 801-808 
    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 Analysis of reported data on the swelling and deformation of polymer networks shows that the volume-dependent term in the deformational free energy cannot be neglected. The analysis is based on a comparison between the equilibrium modulof networks prepared at various dilutions and of the same degree of swelling and on a comparison between concentration dependences of the interaction parameter for a linear and a crosslinked polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256282
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