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  • 1
    Electronic Resource
    Electronic Resource
    Multiple ordered phases in a block copolymer melt (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 1743-1751 
    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/ma00032a019
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  • 2
    Electronic Resource
    Electronic Resource
    Aggregation in Living Polymer Solutions by Light and Neutron Scattering: A Study of Model Ionomers (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 4996-5005 
    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/ma00118a031
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  • 3
    Electronic Resource
    Electronic Resource
    Variable Shear-Induced Orientation of a Diblock Copolymer Hexagonal Phase (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 3008-3011 
    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/ma00112a061
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  • 4
    Electronic Resource
    Electronic Resource
    Ternary mixture of a homopolymer blend and diblock copolymer studied near the Lifshitz composition by small-angle neutron scattering (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 33 (2000), S. 686-689 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A ternary mixture of two homopolymers and the corresponding diblock copolymer represents a good model system to study critical phenomena near the mean field predicted Lifshitz point. The structure factor of concentration fluctuations is in this regime of the phase diagram described by a formula which independently accounts for the peak-position q*, the scattering intensity at q*, S(q*), and the forward scattering, S(0). The susceptibility, which is given by the maximum value of either S(0) or S(q*), shows markedly renormalized critical behavior with critical exponents significant larger than the 3d-Ising value relevant for simple binary blends.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889899013187
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  • 5
    Electronic Resource
    Electronic Resource
    Small-Angle Neutron Scattering Studies of the Phase Behavior and Mesophases of Homopolymers, Block Copolymers and Complex Mixtures (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 30 (1997), S. 702-707 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Small-angle scattering of X-rays and neutrons are particularly powerful techniques for studying complex materials such as polymers, micellar solutions and lyotropic mesophases of amphiphilic molecules. In the present paper, we review some of the recent progress on polymer complex fluids made using small-angle neutron scattering. These studies include examination of the phase behavior of binary polymers where fluctuations due to the free volume significantly renormalize the critical behavior. Block copolymers phase-separate on the microscopic level given by the length scale of the polymer coils and form a variety of mesoscopic ordered phases. Blends of homopolymers and diblock copolymers show new physical phenomena where different critical behavior meets in a Lifshitz point. Block copolymers in selected solutions self-assemble into micellar structures which provide the basis for ordered structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889897001921
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  • 6
    Electronic Resource
    Electronic Resource
    Pressure and Temperature Effects in Homopolymer Blends and Diblock Copolymers (1997)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 30 (1997), S. 696-701 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Thermal composition fluctuations in a homogeneous binary polymer blend and in a diblock copolymer were measured by small-angle neutron scattering as a function of temperature and pressure. The experimental data were analyzed with theoretical expressions, including the important effect of thermal fluctuations. Phase boundaries, the Flory–Huggins interaction parameter and the Ginzburg number were obtained. The packing of the molecules changes with pressure. Therefore, the degree of thermal fluctuation as a function of packing and temperature was studied. While in polymer blends packing leads, in some respects, to a universal behaviour, such behaviour is not found in diblock copolymers. It is shown that the Ginzburg number decreases with pressure sensitively in blends, while it is constant in diblock copolymers. The Ginzburg number is an estimation of the transition between the universality classes of the `mean-field' approximation and the three-dimensional Ising model. The phase boundaries in blends increase with pressure, while the phase boundary of the studied block copolymer shows an unusual shape: with increasing pressure it first decreases and then increases. Its origin is an increase of the entropic and of the enthalpic parts, respectively, of the Flory–Huggins interaction parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889897001404
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  • 7
    Electronic Resource
    Electronic Resource
    Molar-mass dependence of the lamellar thickness in symmetric diblock copolymers (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 835-842 
    Details
    ISSN: 0392-6737
    Keywords: Order-disorder and statistical mechanics of model systems ; Small-angle scattering, EDXD, EXAFS, and other techniques ; Layer structures, intercalation compounds, and superlattices: growth, structure, and nonelectronic properties ; Polymers, elastomers, and plastic ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A homologous series of nine symmetric poly(styrene)-block-poly(butadieme) diblock copolymers was synthesized and characterized. The scaling of the lamellar thickness,D, with the chain lengthN(DαN δ ) was investigated with small-angle X-ray scattering. Different sample preparation methods were used: annealing, solvent-casting and shear alignment. We find that the lamellar thickness and thus the value of the exponent δ depends on the preparation method used,i.e. care must be taken to ensure that the samples investigated are in thermodynamic equilibrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456732
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  • 8
    Electronic Resource
    Electronic Resource
    The bulk dynamics of a compositionally asymmetric diblock copolymer studied using dynamic light scattering (2000)
    Springer
    The European physical journal 1 (2000), S. 275-283 
    Details
    ISSN: 1292-895X
    Keywords: PACS. 61.41.+e Polymers, elastomers and plastics [:AND:] 83.10.Nn Polymer dynamics - 87.64.Cc Scattering of visible, uv, and infrared radiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We have studied the bulk dynamics of a compositionally asymmetric poly(ethylene propylene)-poly(dimethylsiloxane) (PEP-PDMS) diblock copolymer in a large temperature range both in the ordered and in the disordered state. The volume fraction of the PEP block is 0.22. Apart from the disordered state, the sample shows three ordered morphologies. Using dynamic light scattering, we have investigated the dynamics in all four phases and combined these results with those obtained using pulsed field gradient NMR. In the disordered state, we find--apart from the slow cluster mode--the heterogeneity mode related to the self-diffusion of single chains. The relaxation time of this mode, reduced by temperature and the zero-shear viscosity , , increases with temperature. In the cubic phase right below the ODT temperature, we observe two diffusive processes, and we attribute the faster one to the mutual diffusion of micelles and block copolymers not bound to micelles (“free chains”) through the PDMS matrix. The slower mode may either be due to the mutual diffusion of free chains and chains bound to PEP micelles or to the cooperative diffusion of micellar aggregates. In the non-cubic ordered state at intermediate temperatures, an additional weak diffusive mode is observed. The low-temperature ordered state is body-centered cubic, and here, only the mutual diffusion of micelles and free chains lies in our experimental time window.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101890050029
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