Hydrogen-bond induced side-chain liquid crystalline polymers based on nicotinic acid derivatives

Saravanan, C.; Ambili, V.; Kannan, P.

doi:10.1016/j.reactfunctpolym.2009.12.002

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…The molecular arrangement of the rectangular columnar phase in complex 4j is depicted in Figure 8(c) of which the d1 ¼ 4.36 nm (2u ¼ 1.88) and d2 ¼ 3.41 nm (2u ¼ 2.218) are the long and short axes of Col r phase, respectively, and l ¼ 0.5 nm (2u ¼ 15.48) is the lateral molecular distance (11,18). The present complex 4j that possesses four azo linkages favours the disc-shaped arrangement as that reported for nicotinic acid derivatives (19). This observation has strongly implied that the …”

Section: Resultssupporting

confidence: 55%

Self-assembled 1,2-bis[4-(4-(10-decyloxy)phenylazo)]benzoylhydrazine dimer and its hydrogen-bonded complexes

Yeap

Balamurugan

Rakesh

et al. 2013

Supramolecular Chemistry

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Section: Resultssupporting

confidence: 55%

Self-assembled 1,2-bis[4-(4-(10-decyloxy)phenylazo)]benzoylhydrazine dimer and its hydrogen-bonded complexes

Yeap

Balamurugan

Rakesh

et al. 2013

Supramolecular Chemistry

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“…In some cases, hydrogen bonds could positively contribute to LC formation. 30 The amide-containing acrylate (A-C 6 -BA-ABO) showed LC behavior during the heating and cooling processes, although there was a significant high-temperature shift in the LC range compared to that of the ester-linked counterpart (A-C 6 -BA-HBO), as will be mentioned later. The observed high-temperature shift probably results from its hydrogenbonding characteristics and the increased structural rigidity of the amide linkage, 31 which is based on its double-bond character due to keto-enol tautomerism.…”

Section: Bo-containing Acrylate and The Corresponding Polymer Lc Behavior Of The Bo-containing Acrylatesmentioning

confidence: 91%

Liquid‐crystalline behavior and thermal conductivity of vinyl polymers containing benzoxazole side groups

Hasegawa

Nagai

Sokabe

et al. 2021

Polymer International

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A series of methacrylamides containing benzoxazole (BO) mesogenic side groups and different lengths of alkyl units was synthesized in this study. A methacrylamide containing the n-dodecyl group was selected as a suitable monomer to obtain beneficial thermally conductive polymeric materials because of its sufficient solubility in toluene in the subsequent radical polymerization and because of its liquid crystallinity. This methacrylamide led to a highly soluble polymer with film-forming ability. The BO-containing polymethacrylamide also exhibited liquid-crystalline (LC) behavior during the heating and cooling processes. The cast film was kept at a slightly lower temperature than the clearing temperature and quenched to room temperature. This procedure afforded a film maintaining optical anisotropy at room temperature, implying that a frozen LC structure is maintained at room temperature. The quenched film also resulted in a significantly enhanced thermal conductivity (⊗ = 0.60 W m −1 K −1 ) without the aid of fillers and external fields, unlike the as-cast counterpart without optical anisotropy. A polyacrylate containing a flexible long alkylene (C 6 ) spacer between the main chains and a BO-containing mesogenic side group was also investigated. The polyacrylate exhibited LC behavior during the heating and cooling processes over wide ranges. The polyacrylate film quenched from an established temperature, which contains a frozen LC structure, also exhibited a significantly enhanced ⊗ value (0.63 W m −1 K −1 ) without fillers and external fields. Thus, the BO-containing vinyl polymers studied in this work are promising candidates for novel heat-releasing materials.

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“…Saravanan et al exploited the self-assembly of H-bond donor and acceptor complexes through intermolecular complementary hydrogen bond formation, for obtaining supramolecular side-chain liquid-crystalline poly(acrylate)s [49]. To this aim, two poly[4-(m-acryloyloxyalkyloxy) benzoic acid]s (m= 6 or 8) were employed as polymer components, while different LC nicotinic acid derivatives were utilized as complementary H-bond donor/acceptor counterparts.…”

Section: Supramolecular Self-assembled Lcpsmentioning

confidence: 99%

Exploitation of Self‐Assembly Phenomena in Liquid‐Crystalline Polymer Phases for Obtaining Multifunctional Materials

Giamberini

Malucelli

2016

Advanced Materials Interfaces

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This chapter aims to provide a recent overview on the self-assembly phenomena that take place within specific liquid-crystalline polymer (LCP) phases and can be driven by different strategies (such as surface effects, amphiphilic interactions and weak intermolecular forces like hydrogen bonding, -stacking, etc.). Indeed, these phenomena are able to induce the formation of liquid-crystalline domains that may show peculiar thermal, mechanical, barrier, optical, and/or dielectric properties, which can be exploited for the build-up of multifunctional materials for a wide range of applications. Some examples of self-assembled LCP systems are thoroughly discussed, showing the correlations between their structure, the final properties, and some potential applications.

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Hydrogen-bond induced side-chain liquid crystalline polymers based on nicotinic acid derivatives

Cited by 8 publications

References 25 publications

Self-assembled 1,2-bis[4-(4-(10-decyloxy)phenylazo)]benzoylhydrazine dimer and its hydrogen-bonded complexes

Self-assembled 1,2-bis[4-(4-(10-decyloxy)phenylazo)]benzoylhydrazine dimer and its hydrogen-bonded complexes

Liquid‐crystalline behavior and thermal conductivity of vinyl polymers containing benzoxazole side groups

Exploitation of Self‐Assembly Phenomena in Liquid‐Crystalline Polymer Phases for Obtaining Multifunctional Materials

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