Theory of microphase separation in graft and star copolymers

Cruz, Mónica Olvera de la; Sánchez, Isaac C.

doi:10.1021/ma00164a008

Cited by 295 publications

(268 citation statements)

References 10 publications

(15 reference statements)

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“…However, the asymmetry is strongly reduced. Altogether, the phase diagrams show the 'normal' shape as expected from the literature on melts of complex block copolymers [30,15,23]. The asymmetry is obvious due to the fact that the architecture of a comb copolymer is not invariant under the interchange of A with B or f with 1 − f .…”

Section: Phase Diagramssupporting

confidence: 73%

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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: Phase Diagramssupporting

confidence: 73%

“…This translates into the following constraint on R m i (s), represented with the function δ c in eq 1 [15] .…”

Section: Theorymentioning

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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“…10,18,48,49 These fluctuations are described by a matrix of partial structure factors S(q) (q is the scattering vector) that describe correlations between different components in the system. Homogeneous systems have det[S(q)] > 0 for all values of q.…”

Section: Introductionmentioning

confidence: 99%

Microphase and Macrophase Separation in Multicomponent A/B/A−C Polymer Blends with Attractive and Repulsive Interactions

et al. 2006

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A balanced A-C diblock copolymer surfactant was used to organize mixtures of immiscible A and B homopolymers. The C block of the copolymer exhibits repulsive and attractive interactions with the A and B homopolymers, respectively, leading to rich phase behavior. Experimental results indicate the existence of a microphase-separated state at low temperatures, a homogeneous phase at intermediate temperatures, and macrophase separation at high temperatures. It is unusual for a microphase-separated blend to exhibit a homogeneous phase prior to macrophase separation. In this study, component A was saturated polybutadiene with 89% 1,2-addition, component B was polyisobutylene, block A of the diblock copolymer was chemically equivalent to component A, and block C of the diblock copolymer was saturated polybutadiene with 63% 1,2-addition. We use a combination of Flory-Huggins theory (FHT), self-consistent field theory (SCFT) and the random-phase approximation (RPA) to understand the origin of our observations. All of the parameters needed for the SCFT, FHT, and RPA calculations were obtained from independent measurements. The measured length scale of the periodic concentration fluctuations in the homogeneous state and the domain spacing of the microphase-separated blends were in close agreement with RPA and SCFT, respectively. The transition temperatures between phases predicted with theory were in reasonable agreement with the experimental measurements.

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“…[29][30][31][32] As a consequence, the interest gradually shifts toward more complicated architectures such as comb or graft copolymers. [33][34][35][36][37] The discussion of structure formation in comb copolymers using the weak segregation limit has been presented in some detail. Compared to diblock copolymers, the description is only slightly complicated by the fact that the single chain correlation functions are more involved.…”

Section: Introductionmentioning

confidence: 99%

Comb Copolymer Brush with Chemically Different Side Chains

2002

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Comb copolymer brush with chemically different side chainsStepanyan, R.; Subbotin, A.V.; 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. , and poor ( AB / ∼ N -1 ) solvent are derived both by a mean field calculation and by scaling arguments. Properties of the system below and above the transition point are described. Some unusual "bowlike" conformations are predicted for a single molecule in the microphase separated state in a good solvent.

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Theory of microphase separation in graft and star copolymers

Cited by 295 publications

References 10 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

Microphase and Macrophase Separation in Multicomponent A/B/A−C Polymer Blends with Attractive and Repulsive Interactions

Comb Copolymer Brush with Chemically Different Side Chains

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