Structural variations of liquid‐crystalline polymers: Cross‐shaped and laterally linked mesogens in main chain and side group polymers

Berg, Sibylle; Krone, Volker; Ringsdorf, Helmut

doi:10.1002/marc.1986.030070611

Cited by 49 publications

(19 citation statements)

References 22 publications

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“…[12] A similar packing structure to that in Figure 10 has been proposed previously by He [6] and earlier by Ringsdorf [1] for their nematic LC copolymers containing transverse rods capable of a maximum 608 rotation upon stretching. In these cases, in which there is no siloxane component to drive nanoscale segregation, a quiescent nematic arrangement that either has transverse rods and the polymer chain locally oriented in the same direction [6] or has transverse rods interdigitated at a large acute angle to the local polymer chain direction [1] is possible. In our case, with a regularly spaced siloxane unit driving lamellar organization, the arrangement in Figure 10 is possible.…”

Section: X-ray Diffractionsupporting

confidence: 49%

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A Liquid Crystalline Elastomer with a p‐Pentaphenyl Transverse Rod Laterally Attached to the Main Chain

Ren

McMullan

Guo

et al. 2008

Macro Chemistry & Physics

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An LCE with a p‐pentaphenyl transverse rod in the main chain was synthesized, in which the rod can be oriented parallel or normal to the main chain under uniaxial tension. DSC and WAXD studies indicate a highly ordered lamellar structure typical of a smectic A phase. Stress‐strain curves showed a large Young modulus at small strains, followed by a yield point, at which necking occurred and the specimen became transparent. An interesting rigid‐soft‐rigid phenomenon was observed in the yield section, which is likely to indicate a self‐assembly‐driven reconstruction process. Two possible arrangements of transverse rods and chain extenders are proposed for the network structure.magnified image

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Section: X-ray Diffractionsupporting

confidence: 49%

“…There have been previous reports of laterally linked mesogens of high molar mass. [1][2][3][4][5][6][7] The meta linkage was chosen here because it could, in principle, produce a 908 angle between the pentaphenyl rod and the chain direction in the fully extended chain case.…”

Section: Introductionmentioning

confidence: 99%

A Liquid Crystalline Elastomer with a p‐Pentaphenyl Transverse Rod Laterally Attached to the Main Chain

Ren

McMullan

Guo

et al. 2008

Macro Chemistry & Physics

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“…This type of liquid crystalline polymers was described by BERG et al [74]. The polymers have the structure shown in Scheme 16.…”

Section: Macromolecules With Perpendicularly Arranged Rigid Zinits Anmentioning

confidence: 98%

Structural variations of liquid crystalline polymer macromolecules. Review

Sęk

1988

Acta Polymerica

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A review of molecular shapes of liquid crystalline polymers with examples of the representatives of each group is presented. Strukturelle Variationen der Makromolekiile yon fliissig-kristallinen Polymeren. FortschrittsberichtEs wird ein Uberblick iiber die unterschiedlichen strukturellen Formen der Makromolekule von flussig-kristallinen Polymeren gegeben. Fur jede Gruppe wcrden einige reprasentative Beispiele vorgestellt. CmpytcmypmLe sapuayuu maEpoaonetcyn xcu&coicpucmamuuecmx nonmepos. 0630pAaeTCFI 0630p pa3JIHWIbIX CTpYKTYpHbIX @OPM MaKpOMOJIeKyJI XH~KOKpHCTaJIJIINeCKHX IlOJIAMepOB. AJIH KaXAOP rpynnbl IIPHBORFITCH HeCKOJIbKO TUIlHgHbIX IlpHMepOB. , , L , mer J . lS'(l982) 759. 1731 BRAUN. D.. and SCHIILKE. U.: Makromol. Chemie 187 L A

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“…Inspired by the molecular structure of a tetrafunctional mesogenic thiol-ene crosslinker reported by Keller, 36 we designed a series of novel X-shaped monomers 7-m (m 5 7, 8, 9, 10, 11, 12, represent different alkyl tail lengths). As shown in Scheme 2, 2,5-dihydroxyterephthalic acid was first , which had to be prepared through long synthetic routes including oxidation, substitution, and reduction reactions, [16][17][18][19][20][21][22][23][24][25][26][27] these new X-shaped monomers are oxidative inert, highly air-stable and much easier to access.…”

Section: Synthesis and Characterization Of The Polymersmentioning

confidence: 99%

Side‐on main‐chain liquid crystalline polymers prepared by acyclic diene metathesis polymerization and thiol‐ene click step‐growth polymerization

Yang

Lin

et al. 2014

J. Polym. Sci. Part A: Polym. Chem.

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In this manuscript, we design and synthesize a series of X‐shaped mesogenic monomers, bearing two terminal‐alkene tails. Starting from these X‐shaped monomers, acyclic diene metathesis polymerization and thiol‐ene polyaddition are applied for the first time to prepare two series of side‐on main‐chain liquid crystalline polymers (LCPs), respectively. The mesomorphic behaviors and structure‐property relationships of these new polymers are studied in detail by a combination of 1H NMR, GPC, TGA, DSC, POM, and XRD experiments. It turns out that the length of alkoxy terminal chains of the embedded mesogens and the length of the spacer connecting two adjacent mesogens on the polymer backbones markedly influence the mesomorphic properties. Furthermore, a side‐on main‐chain liquid crystalline elastomer fiber is prepared by crosslinking the LCP using a UV‐sensitive bifunctional benzophenone crosslinker. In comparison with the pure polymer fiber's monodomain alignment, the crosslinked elastomer fiber however shows nonaligned polydomain structure, probably due to the order competitions between the mixed crosslinkers, mesogens, and polymer backbones. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 1086–1098

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Structural variations of liquid‐crystalline polymers: Cross‐shaped and laterally linked mesogens in main chain and side group polymers

Cited by 49 publications

References 22 publications

A Liquid Crystalline Elastomer with a p‐Pentaphenyl Transverse Rod Laterally Attached to the Main Chain

A Liquid Crystalline Elastomer with a p‐Pentaphenyl Transverse Rod Laterally Attached to the Main Chain

Structural variations of liquid crystalline polymer macromolecules. Review

Side‐on main‐chain liquid crystalline polymers prepared by acyclic diene metathesis polymerization and thiol‐ene click step‐growth polymerization

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