Scattering theory and properties of block copolymers with various architectures in the homogeneous bulk state

Benoît, H.; Hadziioannou, G

doi:10.1021/ma00183a040

Cited by 240 publications

(249 citation statements)

References 9 publications

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“…Here, the total number of monomers of the comb copolymer N has been divided by n t in order to correctly account for the length of the repeat unit. [11,13]. It is important to realize again that in this case an increase in f A corresponds to a decrease in the side chain length compared to the length of the backbone between two successive side chains.…”

Section: Discussionmentioning

confidence: 95%

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Ordering at Two Length Scales in Comb−Coil Diblock Copolymers Consisting of Only Two Different Monomers

Nap

Brinke²,

Brinke³

2002

Macromolecules

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The microphase separated morphology of a melt of a specific class of comb-coil diblock copolymers, consisting of an AB comb block and a linear homopolymer A block, is analyzed in the weak segregation limit. On increasing the length of the homopolymer A block, the systems go through a characteristic series of structural transitions. Starting from the pure comb copolymer the first series of structures involve the short length scale followed by structures involving the large length scale. A maximum of two critical points exists. Furthermore, in the two parameter space, characterizing the comb-coil diblock copolymer molecules considered, a non-trivial bifurcation point exists beyond which the structure factor can have two maxima (two correlation hole peaks).

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Section: Discussionmentioning

confidence: 95%

“…The phase behavior of pure AB comb copolymer melts, i.e., without the A homopolymer block, has already been discussed in several papers. [11][12][13][14]. However, all of these, except for Dobrynin and Erukhimovich [14], are restricted to the calculation of the spinodals only.…”

Section: Parameterizationmentioning

confidence: 99%

Ordering at Two Length Scales in Comb−Coil Diblock Copolymers Consisting of Only Two Different Monomers

Nap

Brinke²,

Brinke³

2002

Macromolecules

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“…[3][4][5][6][7]12 No order-disorder transitions have been observed. The phase behavior of both systems resembles in many ways that of ordinary comb copolymers, [13][14][15][16] however, in particular for the more weakly associating systems also interesting differences are predicted due to the reversible nature of the side chain association. 17,18 The above phase behavior concerns pure polymer-oligomer systems without additional solvent.…”

Section: Introductionmentioning

confidence: 82%

On lyotropic behavior of molecular bottle-brushes: A Monte Carlo computer simulation study

Saariaho

Ikkala

Szleifer

et al. 1997

The Journal of Chemical Physics

129

175

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On lyotropic behavior of molecular bottle-brushes Saariaho, M.; Ikkala, O.; Szleifer, I.; Erukhimovich, I.; ten Brinke, G. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. A three dimensional continuous space Monte Carlo computer simulation study is presented to discuss the extension of flexible, linear polymer chains due to the presence of equally flexible side chains. We consider the enhancement of the persistence length of bottle-brush structures in an athermal solution due to steric interactions between the side chains. The largest structure studied consists of a backbone of 100 beads with 50 side chains of 20 beads each. The persistence length is evaluated in two different ways using the radius of gyration of the backbone and the bond angle correlation function, respectively. A correct description of the backbone conformations is shown to require at least two characteristic lengths. At a small length scale the backbone behaves flexible; the extension occurs at a larger length scale. There is a strong indication that the ratio between the persistence length and the diameter, which is the determining factor for lyotropic behavior of conventional semiflexible chains, levels off as a function of the side chain length. The value of this ratio is, moreover, too small to induce lyotropic behavior along this line. Recent experimental observations of lyotropic behavior of polymacromonomers are discussed in terms of these findings.

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“…The latter result is also understandable since the block in the ring are more constrained than in the diblock. To see how severe are these constraints it is instructive to compare the instability in the ring copolymer to that in the (AB) n copolymer 80) where there are n AB diblocks joined together in the linear chain. The size of the AB diblock is N and each blocks has the size N/2 (symmetric case).…”

Section: A Ring Copolymersmentioning

confidence: 99%

The structure and phase transitions in polymer blends, diblock copolymers and liquid crystalline polymers: The Landau‐Ginzburg approach

Hołyst

Vilgis

1996

Macro Theory & Simulations

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The polymer systems are discussed in the framework of the Landau-Ginzburg model. The model is derived from the mesoscopic Edwards hamiltonian via the conditional partition function. We discuss flexible, semiflexible and rigid polymers.The following systems are studied: polymer blends, flexible diblock and multi-block copolymer melts, random copolymer melts, ring polymers, rigid-flexible diblock copolymer melts, mixtures of copolymers and homopolymers and mixtures of liquid crystalline polymers. Three methods are used to study the systems: mean-field model, self consistent one-loop approximation and self consistent field theory. The following problems are studied and discussed: the phase diagrams, scattering intensities and correlation functions, single chain statistics and behavior of single chain close to critical points, fluctuations induced shift of phase boundaries. In particular

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Scattering theory and properties of block copolymers with various architectures in the homogeneous bulk state

Cited by 240 publications

References 9 publications

Ordering at Two Length Scales in Comb−Coil Diblock Copolymers Consisting of Only Two Different Monomers

Ordering at Two Length Scales in Comb−Coil Diblock Copolymers Consisting of Only Two Different Monomers

On lyotropic behavior of molecular bottle-brushes: A Monte Carlo computer simulation study

The structure and phase transitions in polymer blends, diblock copolymers and liquid crystalline polymers: The Landau‐Ginzburg approach

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