Effect of smectogenicity of the ionic groups on the thermotropic liquid crystalline behavior of pyridinium and poly(4-vinylpyridinium) salts quaternized with mesogenic groups

Chovino, Christian; Frère, Y.; Guillon, Daniel; Gramain, Philippe

doi:10.1002/(sici)1099-0518(19970930)35:13<2569::aid-pola4>3.0.co;2-m

Cited by 19 publications

(14 citation statements)

References 9 publications

(12 reference statements)

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“…4). A similar effect was observed in most of the systems of Guillon and coworkers mentioned earlier (they reported first‐ and second‐order reflections of similar intensity generally), and was associated with an additional plane of symmetry in the lamellar electron density profile 32–34…”

Section: Resultssupporting

confidence: 83%

“…Its monolayer nature concords with what we observed for other complexes with sulfonated polyelectrolytes,13, 19 but it contrasts with the partially interdigitated smectic A mesophases formed by the similar complex reported by Ujiie and Iimura12 and by the proton‐transfer surfactomesogen complexes described previously by us 18. On the other hand, analogous SCLCP polymers, where mesogenic side groups are attached covalently to ionic (quaternized) backbones, were found by Guillon and coworkers to also give rise to orthogonal single‐layer mesophases,6, 32, 33 including for mesogenic groups with cyano and chiral tails (which are typically associated with partial bilayer and tilted layer mesophases, respectively) 34. The latter result was attributed to the dominant effect of the ionic interactions on the packing structure.…”

Section: Resultssupporting

confidence: 65%

“…Two possible models of the monolayer structure, proposed also by Guillon and coworkers for their materials32–34 and equally applicable to the present systems, are illustrated in Figure 5. The first model (left) shows a completely interdigitated lamellar packing of the side chains giving lateral alternating head‐to‐tail orientation.…”

Section: Resultsmentioning

confidence: 82%

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Liquid crystalline complexes of an azo‐containing surfactomesogen with oppositely charged polyelectrolytes

Tibirna

Bazuin

2005

J Polym Sci B Polym Phys

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A triethyl-ammonium functionalized 4-nitro-4 0 -alkoxy azobenzene mesogen with a 10-carbon spacer (azo10Q, a ' 'surfactomesogen' ') was complexed in equimolar proportions to a variety of oppositely charged polyelectrolytes, and studied by differential scanning calorimetry (DSC), polarizing optical microscopy, and X-ray diffraction. The complexation generates a single-layer smectic A mesophase over a very wide temperature range from a surfactomesogen that, alone, melts directly to the isotropic phase. The clearing temperatures, ranging from 130 to 190 8C and generally higher than the melting point of azo10Q, are dependent on the nature of the polyelectrolyte as well as its molecular weight. In contrast, a prominent glass transition near ambient temperature appears to be independent of molecular weight, but varies somewhat with the type of polyelectrolyte. A second T g -like transition of much lower intensity is detectable at higher temperatures (generally above 100 8C), and, with literature support, is tentatively attributed to nanophase separation involving sublayer planes in the lamellar packing structure. A series of nonequimolar complexes was also investigated, and it was found that, with decreasing azo10Q content, the clearing temperature viewed by DSC decreases rapidly in intensity (and somewhat in temperature) and then disappears although birefringence remains, whereas the lower glass transition increases rapidly in temperature to finally merge with the upper one.

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Section: Resultssupporting

confidence: 83%

Section: Resultssupporting

confidence: 65%

See 1 more Smart Citation

Liquid crystalline complexes of an azo‐containing surfactomesogen with oppositely charged polyelectrolytes

Tibirna

Bazuin

2005

J Polym Sci B Polym Phys

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“…Our design is to incorporate ionic liquid moieties into side‐chain LC polymers. There are a few reports28–31 on side‐chain ionic LC polymers. These materials may have the potential for application as solid polymer electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Water in different poly(styrene sulfonic acid)‐grafted fluoropolymers

Walsby

Hietala

Maunu

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:We investigated the water present in a series of radiation-grafted fluoropolymers with similar poly(styrene sulfonic acid) (PSSA) contents with the aim of determining the influence of the initial fluoropolymer. Radiationgrafted membranes were compared with Nafion 117 and 105. Sorption curves and differential scanning calorimetry thermograms showed that all the membranes contained the same number of water molecules tightly bound to the sulfonic acid groups; this water did not freeze. In radiationgrafted membranes, the content of freezing water absorbed from the liquid-phase water varied according to the swelling abilities of the membrane, which were dependent on the initial fluoropolymer. Larger pores accompanied high water uptakes and high conductivity. The amount of water absorbed from the vapor phase was similar for all radiationgrafted membranes with similar PSSA contents, irrespective of matrix material. Nafion membranes had higher conductivities at intermediate hydration levels, and the relaxation times measured by NMR were longer than for the radiationgrafted materials. This suggests that the channels for water and proton conduction are different in the two types of materials.

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“…In a previous study, we observed 4‐vinylpyridine (4VP) N ‐substituted with an alkyloxybiphenyl mesogen polymerizes spontaneously leading to a fully quaternized poly(4‐vinylpyridine) (P4VP) 6. This specific polymerization method was used to prepare P4VP N ‐substituted with different mesogens; however, there has been no report on the use of π‐conjugated cores longer than a biphenyl group 7, 8. P4VP N ‐substituted with biphenyl cores through a flexible spacer normally develops single‐layer smectic phases with upright molecules (or mesogens) laterally arranged head to tail, as was deduced for pyridine N ‐substituted with similar mesogens 9, 10.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and liquid‐crystalline properties of poly(4‐vinylpyridinium) bromides N‐substituted with dialkyloxyterphenyl groups

Santos-Martell

Larios-López

Rodríguez-González

et al. 2010

J of Applied Polymer Sci

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Poly(4-vinylpyridine)s (P4VPs) fully and partially quaternized with dialkyloxyterphenyl groups were synthesized and characterized. These new polymers developed both liquid-crystalline (LC) properties and a light emission (luminescence) in the blue region. The mesomorphic behavior of the polymers was initially characterized by differential scanning calorimetry and polarizing optical microscopy and was further corroborated by X-ray diffraction analyses. The X-ray diffraction patterns showed in the low-angles region several equidistant diffraction peaks (d 001 , d 002 , d 003 , . . .) and in the wide-angles region a broad peak typical of nonordered mesophases. From d 001 and the length of the monomers, we deduced that the molecular arrangement in the mesophase corresponded to a double-layered stacking of molecules with mesogens tilted with respect to the smectic plane and the backbones sandwiched between. In this arrangement, the different parts of mesogens are segregated from one another in layered domains. The longer smectic periods observed for copolymers indicated that the nonsubstituted pyridine cycles were sandwiched between two smectic layers. The emission spectra of these polymers were characterized by a broad signal centered at 365 nm. The combination of LC properties with luminescence in the polymers is interesting for the preparation of thin films with aligned emitters, particularly for linearly polarized light emission.

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Effect of smectogenicity of the ionic groups on the thermotropic liquid crystalline behavior of pyridinium and poly(4-vinylpyridinium) salts quaternized with mesogenic groups

Cited by 19 publications

References 9 publications

Liquid crystalline complexes of an azo‐containing surfactomesogen with oppositely charged polyelectrolytes

Liquid crystalline complexes of an azo‐containing surfactomesogen with oppositely charged polyelectrolytes

Water in different poly(styrene sulfonic acid)‐grafted fluoropolymers

Synthesis and liquid‐crystalline properties of poly(4‐vinylpyridinium) bromides N‐substituted with dialkyloxyterphenyl groups

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