Tuning Structures of Mesogen‐Jacketed Liquid Crystalline Polymers and Their Rod–Coil Diblock Copolymers by Varying Chain Rigidity

Pan, Hongbing; Jing, Ping; Xiao, Anqi; Lyu, Xiaolin; Shen, Zhihao; Fan, Xinghe

doi:10.1002/macp.201700593

Cited by 6 publications

(7 citation statements)

References 53 publications

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“…From the experimental point of view, the lamellar phase seems to be the most stable ordered phase although some experimental diagrams also contain the hexagonal phase as well as phases with more complicated morphology. In contrast, a broad hexagonal phase and a very rich variety of other phases has been observed in rod-coil block copolymers in which the rigid block is composed of a flexible main chain with rigid mesogenic side groups [45,46].…”

Section: Discussionmentioning

confidence: 99%

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Molecular theory of liquid-crystal ordering in rod-coil diblock copolymers

Osipov

Gorkunov

2019

Phys. Rev. E

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Molecular-statistical theory of rod-coil diblock copolymers is proposed using the general density functional approach which enables one to consider the cases of both weak and strong segregation. The free energy of the system is expressed as a functional of the phase-space densities of rod and coil monomers, which depend on the orientational and translational order parameters. Temperature-concentration phase diagrams are obtained and the profiles of all order parameters are calculated numerically by minimizing the polymer free energy. The lamellar phase is shown to possess strong orientational order which is partially induced by the phase structural anisotropy. The enhanced stability of the lamellar phase is determined by a combination of the microphase separation effects and the emergence of long-range smectic order.

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Section: Discussionmentioning

confidence: 99%

“…Phase diagrams and the profiles of the orientational and translational order parameters of rod-coil diblock copolymers can be calculated numerically by minimization of the freeenergy Eq. (46). A typical temperature-concentration phase diagram is presented in Fig.…”

Section: Phase Diagrams and Order Parameter Profilesmentioning

confidence: 99%

Molecular theory of liquid-crystal ordering in rod-coil diblock copolymers

Osipov

Gorkunov

2019

Phys. Rev. E

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“…Thus, the chemical structure correctness of the hydrogen-bonding donor is confirmed by the 1 H NMR and FT-IR data. The molecular weight (MW) of PDMS- b -PM1H was calculated on the basis of PDMS- b -PM1 reported in our previous work . The calculation formula can be expressed as M = M 1 – 112 n , where M and M 1 are the MWs of PDMS- b -PM1H and PDMS- b -PM1, respectively, and n is the DP of the PM1 block.…”

Section: Resultsmentioning

confidence: 99%

Persistent Formation of Self-Assembled Cylindrical Structure in a Liquid Crystalline Block Copolymer Constructed by Hydrogen Bonding

et al. 2018

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A series of supramolecular liquid crystalline block copolymers (SLCBCPs) were prepared by hydrogen-bonding interaction between poly(dimethylsiloxane)-b-poly(2-vinylterephthalic acid) (PDMS-b-PM1H) and [4-(4′-hexyloxy)styryl]pyridine (NC6). PDMS-b-PM1H serves as the hydrogen-bonding donor and NC6 as the hydrogen-bonding acceptor. The SLCBCPs are obtained by mixing the hydrogen-bonding acceptor and donor in pyridine. Through increasing the molar ratio of pyridine to carboxyl, the SLCBCPs can transform from coil–coil block copolymers (BCPs) to rod–coil ones. When the ratio of pyridine to carboxylic acid is 0.50 or lower, the SLCBCPs are coil–coil-like. However, when the ratio exceeds 0.50, the SLCBCPs behave like rod–coil BCPs because the supramolecular block PM1H(NC6) exhibits liquid crystalline (LC) behavior owing to the “jacketing” effect. Small-angle X-ray scattering and transmission electron microscopy experiments were employed to characterize the microphase-separated nanostructures of the SLCBCPs. Interestingly, when the weight fraction of the supramolecular block PM1H(NC6) ranges from 51% to 92%, hexagonally packed cylinders (HEX) are always obtained. Compared to conventional BCPs, the SLCBCPs prepared can more easily self-assemble into the HEX nanostructures that may potentially serve as nanotemplates and porous materials after selective etching. In addition, the SLCBCPs can form hierarchically ordered nanostructures, including the HEX nanostructure of the SLCBCP and the LC phase of the supramolecular block.

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“…[ 119–124 ] In recent years the synthesis of such block copolymers was changed to methods of controlled radical polymerization or ring‐opening‐metathesis‐polymerization. [ 125–129 ] This made a direct synthesis of many block‐copolymers possible and led to the first systems, in which both blocks are LC. [ 125,127–129 ] This can be i) polymers with two rod‐like LC‐blocks, ii) polymers with two or three blocks of LC‐side chain polymers, or iii) polymers, which combine a central block of the LC‐main chain type and two peripheral blocks of the LC‐side chain type.…”

Section: Smectic Block‐copolymers With Lc and Non‐lc Componentsmentioning

confidence: 99%

“…[ 125–129 ] This made a direct synthesis of many block‐copolymers possible and led to the first systems, in which both blocks are LC. [ 125,127–129 ] This can be i) polymers with two rod‐like LC‐blocks, ii) polymers with two or three blocks of LC‐side chain polymers, or iii) polymers, which combine a central block of the LC‐main chain type and two peripheral blocks of the LC‐side chain type. [ 125,127,128,130,131 ]…”

Section: Smectic Block‐copolymers With Lc and Non‐lc Componentsmentioning

confidence: 99%

LC‐Polymers and Smectic Phases with Special Substructures/Nanophase Segregation

Zentel

2021

Macro Chemistry & Physics

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Liquid crystalline (LC) polymers find still a lot of interest, whereby the focus is—at present—on LC‐elastomers with different phases and their application for mechanical actuation. While the LC‐phases in LC‐polymers can—generally—be well described in analogy to their low molar mass counterparts, some special properties became evident for some systems with smectic phases. They are related to the modulation of the nanophase segregation within the smectic layers and include often the formation of sublayers consisting of poorly compatible parts of the polymer like bulky (=non mesogenic) units, ionic groups, or poorly miscible parts of the main chain (e.g., polysiloxanes). Such a behavior can be found for semiflexible LC‐main chain polymers and for LC‐side chain polymers. Here the authors i) describe polymers for which such a modification of the smectic structure is observed, ii) discuss the origin of the deviation, and iii) describe possible application for the design of functional materials. The formation of the substructures can allow, for example, a mixing of the LC‐polymers with other polymers, which have a good affinity to the second sublayer. It also allows it to separate, to some extent, the network structure from the packing of the mesogens in LC‐polysiloxanes.

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Tuning Structures of Mesogen‐Jacketed Liquid Crystalline Polymers and Their Rod–Coil Diblock Copolymers by Varying Chain Rigidity

Cited by 6 publications

References 53 publications

Molecular theory of liquid-crystal ordering in rod-coil diblock copolymers

Molecular theory of liquid-crystal ordering in rod-coil diblock copolymers

Persistent Formation of Self-Assembled Cylindrical Structure in a Liquid Crystalline Block Copolymer Constructed by Hydrogen Bonding

LC‐Polymers and Smectic Phases with Special Substructures/Nanophase Segregation

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