Order to disorder transition of comb copolymer Am+1Bm: a self-consistent field study

Wang, Rong; Jiang, Zhibin; Hu, Jinglei

doi:10.1016/j.polymer.2005.03.115

Cited by 16 publications

(38 citation statements)

References 49 publications

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“…This phenomena is also observed in A m+1 B m diblock comb copolymer. 26 The confined segments increase with side chain number increasing, so the χN increases, which means lower temperatures to microphase separate.…”

Section: Resultsmentioning

confidence: 99%

Disorder-to-Order Transition of Triblock Comb Copolymer A_m+1(BC)_m

Qian

Wang

2011

Macromolecules

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The disorder to order transition of comb copolymer A m+1(BC) m is investigated by the self-consistent field theory. The interaction parameters between the three different blocks are considered by varying the composition of the comb triblock copolymer with the side chain number m = 1 and 3. As the side chain number m increases, the Flory–Huggins interaction parameter of disorder to order transition (DOT) increases and the lowest DOT occurs when the volume fractions of blocks A, B, and C are approximately equal. When one component is the minority, the disorder-to-order transition curve is similar to binary A m+1B m comb copolymer. The influence of the side chain density on phase transition is also discussed. The comb copolymer is more difficult to phase separate with larger side chain number m and shorter side chain.

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Section: Resultsmentioning

confidence: 99%

Disorder-to-Order Transition of Triblock Comb Copolymer A_m+1(BC)_m

Qian

Wang

2011

Macromolecules

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“…However, block B is also restricted by block A. So, the influence of block B on DOT is larger than that of block C. Compared with the comb block copolymer (B m + 1 - g -C m ) [37], we can see that the disorder to order transition is very similar. The curves are asymmetric.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, more and more researchers pay attention to the disorder to order phase transition of supramolecular polymers [30–32]. At the meantime, self-consistent field theory (SCFT) method has been largely used to study the phase behavior of block copolymers [33–37]. It is also used to study the disorder to order transition of block copolymers [38, 39].…”

Section: Introductionmentioning

confidence: 99%

Disorder to Order Transition and Ordered Morphology of Coil-Comb Block Copolymer by Self-Consistent Field Theory

Jiang¹,

Qian²,

Yang³

et al. 2015

Nanoscale Res Lett

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The disorder to order transition and the ordered patterns near the disordered state of coil-comb copolymer A-b-(Bm + 1-g-Cm) are investigated by the self-consistent field theory. The phase diagrams of coil-comb copolymer are obtained by varying the composition of the copolymer with the side chain number m = 1, 2, and 3. The disorder to order transition is far more complex compared with the comb copolymer or linear block copolymer. As the side chain number m increases, the Flory-Huggins interaction parameter of disorder to order transition (DOT) increases and the lowest DOT occurs when the volume fractions of blocks A, B, and C are approximately equal. When one component is the minority, the disorder to order transition curve is similar with binary copolymer, but the curve shows the asymmetric property. The comb copolymer is more stable with larger side chain number m and shorter side chain. The ordered patterns from the disordered state are discussed. The results are helpful for designing coil-comb copolymers and obtaining the ordered morphology.

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“…Therefore, the volume fractions of the backbone chain A and the side groups B are given: f A = ( m + 1) N A / N and f B = mN B / N . Because the structure parameter m affects the phase diagram of the comb copolymer, we fix m = 10 in this paper to focus on the influencing factors including the stiff extent of the main chain on the liquid crystal behaviors of MCSCLCPs. The composition of the species can be varied by changing the grafting density (the number of side chains per unit length of the backbone chain).…”

Section: Theoretical Formalismmentioning

confidence: 99%

“…The self-consistent field theory (SCFT) has proved to be one of the most successful theoretical methods for investigating equilibrium phases of block copolymers 34 including comblike architectural polymers. 35 For the continuous wormlike chain model, however, solving the diffusion equation of the chain propagator q(r,u,s) for describing the chain segment distribution becomes difficult due to the introduction of the extra parameter, namely a unit vector defined on a spherical surface u for describing the orientation of semiflexible segments. For the case of r-independent nematic phase, the Legendre-expansion approach for solving q(u,s), in the form of long-chain statistics, was initiated by Vroege and Odijk.…”

Section: ■ Introductionmentioning

confidence: 99%

Uniaxial–Biaxial Nematic Phase Transition in Combined Main-Chain/Side-Chain Liquid Crystal Polymers Using Self-Consistent Field Theory

2012

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We investigate the isotropic–anisotropic phase transitions and the conformation of combined main-chain/side-chain liquid crystal polymers (MCSCLCPs) by numerically solving semiflexible chain self-consistent field theory (SCFT) equations with the pseudospectral method. Two kinds of interactions are involved: the global coupling between backbone segments, between the backbone and side groups, and between the side mesogens and the local coupling between the polymer backbone and its attached side groups. When the hinges are flexible, both global and local effects prefer parallel alignments of backbone and side groups, forming only prolate uniaxial nematic phase NPIII. When the hinges are relatively stiff, the competition between the global interaction preferring parallel orientations of the system and the perpendicular tendency of the two components due to the comb architecture results in rich phases with various orientation modes, including uniaxial prolate phases NPI, NPII, and oblate phase NO and biaxial phases NBI, NBII, and NBIII. The new phases NO and NBIII have not yet been reported by the previous theoretical results. We conclude that the occurrence of the biaxial phases results from not only the perpendicular toplogical structures between the oriented main chain and side groups but also the bending feature of the wormlike chain backbone, another necessary condition for NBI and NBII.

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Order to disorder transition of comb copolymer Am+1Bm: a self-consistent field study

Cited by 16 publications

References 49 publications

Disorder-to-Order Transition of Triblock Comb Copolymer A_m+1(BC)_m

Disorder-to-Order Transition of Triblock Comb Copolymer A_m+1(BC)_m

Disorder to Order Transition and Ordered Morphology of Coil-Comb Block Copolymer by Self-Consistent Field Theory

Uniaxial–Biaxial Nematic Phase Transition in Combined Main-Chain/Side-Chain Liquid Crystal Polymers Using Self-Consistent Field Theory

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Order to disorder transition of comb copolymer Am+1Bm: a self-consistent field study

Cited by 16 publications

References 49 publications

Disorder-to-Order Transition of Triblock Comb Copolymer Am+1(BC)m

Disorder-to-Order Transition of Triblock Comb Copolymer Am+1(BC)m

Disorder to Order Transition and Ordered Morphology of Coil-Comb Block Copolymer by Self-Consistent Field Theory

Uniaxial–Biaxial Nematic Phase Transition in Combined Main-Chain/Side-Chain Liquid Crystal Polymers Using Self-Consistent Field Theory

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Disorder-to-Order Transition of Triblock Comb Copolymer A_m+1(BC)_m

Disorder-to-Order Transition of Triblock Comb Copolymer A_m+1(BC)_m