Design, Synthesis, and Characterization of Bent-Core Mesogen-Jacketed Liquid Crystalline Polymers

Chen, Xiaofang; Tenneti, Kishore; Bai, Yaowen; Zhou, Rong; Wan, Xinhua; Fan, Xinghe; Zhou, Qifeng

doi:10.1021/ma051939d

Cited by 67 publications

(56 citation statements)

References 60 publications

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“…When the two samples were heated to a temperature much higher than the highest phase transition temperature, the LC birefringence was still observed and remained before decomposition. These phenomena were all similar to other MJLCPs [32,33]. Using PG1-3 as an example, Figs.…”

Section: Phase Transitions and Phase Structuressupporting

confidence: 84%

“…The steric hindrance produced by the bulky and rigid side groups will force the main-chain to exhibit an extended and stiff conformation similar to dendronized polymers [4,5,[11][12][13][14][15][16][17][18][19][20]. In the past two decades, systematic research on the structure-property relationships for MJLCPs with different side groups has been done [27][28][29][30][31][32][33]. Recently, the functionalization of this system has been researched.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Phase Structures of Dendronized Polymers with Dendritic Azobenzene Side Groups Based on Mesogen-Jacketed Liquid Crystalline Polymers

Yang

Lü

et al. 2014

Molecular Crystals and Liquid Crystals

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The first-and second-generation dendronized polymers, poly (2, 5-bis {[3, 5-di (4 -methoxy-4-oxyhexyloxy azobenzene) benzyl] oxycarbonyl} styrene) (PG1) and poly (2, 5-bis {3, 5-di [3, 5-di (4 -methoxy-4 -oxyhexyloxy azobenzene) benzyl] oxycarbonyl} styrene) (PG2), were successfully synthesized, and their phase structures were investigated by differential scanning calorimetry (DSC), polarized light microscopy (PLM), and one-dimensional wide-angle X-ray diffraction (1D WAXD). The results show that the liquid crystalline (LC) phase structures of the dendronized polymers containing dendritic azobenzene side groups depend strongly on the molecular weights (MWs) and the generation of dendritic azobenzene side groups. Compared the low MWs PG2with the low MWs PG1, the degree of order in LC phase increased with increasing the generation of dendritic azobenzene side groups.

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Section: Phase Transitions and Phase Structuressupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Synthesis and Phase Structures of Dendronized Polymers with Dendritic Azobenzene Side Groups Based on Mesogen-Jacketed Liquid Crystalline Polymers

Yang

Lü

et al. 2014

Molecular Crystals and Liquid Crystals

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“…Schematic Representation of the Shear Geometry BP molecule has a contour length of ∼3.3 nm, we propose that each smectic layer consists of two layers of BP molecules forming a bilayer structure (SmA 2 ), similar to a few other bentcore LC polymers reported. 34,43 The smectic layer scattering arcs are weak, possibly due to the low concentration of the BP molecules. Note that pure BP molecules do not exhibit LC behavior.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Nanostructures of Bent-Core Molecules Blended with Poly(styrene-b-4-vinylpyridine) Block Copolymer

et al. 2007

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We report the phase structures observed in blends of poly(styrene-b-4-vinylpyridine) (PS-b-P4VP) block copolymer (BCP) and a bent-core molecule 1-[4′-(3′′,4′′,5′′-tridecyloxybenzoyloxy)phenyleneoxycarbonyl]-3-[(4′-hydroxyphenyl)oxycarbonyl]benzene (BP). Hydrogen bonding between the terminal -OH group of BP and pyridine of P4VP led to the formation of P4VP(BP) n complex, which exhibited liquid crystalline (LC) order. This LC ordering, combined with microphase separation of the BCP, led to the formation of hierarchical nanostructures. The phase structures of the blend samples were investigated as a function of the concentration of BP using small-angle and wide-angle X-ray scattering and transmission electron microscopy techniques. By increasing the BP content, BCP phase morphology transformed from lamellae to cylinders. In the two cases investigated, the P4VP/BP complex formed a bilayer smectic A LC structure within the BCP domains, and these layered structures were oriented perpendicular to the BCP interface. A detailed structural and morphological study will be reported. IntroductionHierarchical nanostructures, usually spanning from the molecular scale (sub-nanometers) to hundreds of nanometers, are of great technological importance. Block copolymers (BCPs) provide one of the most straightforward templates to achieve hierarchical nanostrucutres. 1 BCP microphase separation could lead to the formation of a variety of structures such as lamellae, cylinders, gyroid, and spheres. 2 The length scale of these phase separated structures is ∼10-50 nm. Amorphous BCP (coilcoil) phase structures have been extensively investigated. 2,3 Tuning the chemical structure of one or several segments of the BCP leads to the possibility of forming a secondary structural order within the BCP domains. To this end, a few types of BCP systems have been proposed, including crystalline-amorphous (or crystalline-crystalline) BCPs 4-8 and liquid crystalline (LC) BCPs. 9-20 In the first case, polymer chains crystallize in the confined (soft or hard confinement) space that is formed by the BCP microphase separation. Structural hierarchy can be achieved due to the ordered structure formation at two different length scales as a result of BCP microphase separation (10-50 nm) and the crystalline structure formation (1-10 nm). In the second case, LC or LC polymers are used as one BCP block. LCs form ordered structures on the 1-10 nm length scale. Thus, LC BCPs represent a natural hierarchical-structure-forming system. The structural flexibility of LC also enables incorporating functionalities into BCP microdomains. A number of LC BCPs have been investigated. Depending on the LC molecular architecture, LC BCPs can be divided into side-chain LC-BCPs, 9,[12][13][14]20 main-chain LC-BCP, 15,16 and BCPs formed by mesogen-

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“…New structures with functional groups were designed. 31,32 Interesting results were obtained. However, controlled radical polymerization techniques were less frequently used.…”

Section: Molecular Design and Synthesis Of Mjlcpsmentioning

confidence: 95%

Jacketed polymers: Controlled synthesis of mesogen‐jacketed polymers and block copolymers

Gao

Fan

Shen

et al. 2008

J. Polym. Sci. A Polym. Chem.

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The controlled radical polymerization of mesogen‐jacketed liquid crystalline polymers has triggered great interests in synthesis of complex structures as well as well‐defined linear homopolymers with controlled molecular weight and narrow molecular weight distributions. This review highlights the synthetic strategies of controlled radical polymerization of linear homopolymers, star polymers, superbranched polymers, graft polymers, block copolymers, star block copolymers, and so on. The employed living methods include nitroxide‐mediated radical polymerization and atom transfer radical polymerization. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 319–330, 2009

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Design, Synthesis, and Characterization of Bent-Core Mesogen-Jacketed Liquid Crystalline Polymers

Cited by 67 publications

References 60 publications

Synthesis and Phase Structures of Dendronized Polymers with Dendritic Azobenzene Side Groups Based on Mesogen-Jacketed Liquid Crystalline Polymers

Synthesis and Phase Structures of Dendronized Polymers with Dendritic Azobenzene Side Groups Based on Mesogen-Jacketed Liquid Crystalline Polymers

Hierarchical Nanostructures of Bent-Core Molecules Blended with Poly(styrene-b-4-vinylpyridine) Block Copolymer

Jacketed polymers: Controlled synthesis of mesogen‐jacketed polymers and block copolymers

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