Multiple Effects Tailoring the Self-organization Behaviors of Triphenylene Side-chain Liquid Crystalline Polymers via Changing the Spacer Length

Han, Xianghui; Yang, Xin; Chen, Sheng; Luo, Hang; Zhang, Dou; Zhang, Hai-Liang

doi:10.1007/s10118-018-2108-9

Cited by 12 publications

(3 citation statements)

References 45 publications

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“…Since the first liquid crystal polymer synthesized [25] using typical benzoate LC molecule, various types of LC molecules are thenceforth suggested in a way to tune the phase behavior of the material. For instance, the phase transition properties can be tuned by alternating different flexible spacer lengths [18,19], modulating microscopic irregularity. The crosslinked networks and polymers can also become reactive to light, by using mesogens that bear azobenzene chromophores [31], whose trans-cis isomerization affects overall LC orders.…”

Section: Microscale Lc Behaviorsmentioning

confidence: 99%

Multiscale Phase Behaviors of Nematic Solids: A Short Review

Kim

Lee

et al. 2022

Multiscale Sci. Eng.

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Nematic liquid crystalline solids are novel smart materials of which mesogenic molecules are incorporated within their polymeric chains via crosslinking. The material exhibits many interesting phase behaviors and is envisaged to be harnessed as a key material of soft responsive structures that are adaptive to their surroundings. These behaviors are originated by intricate interactions between diverse phenomena ranging from molecular interactions, mesoscopic phase transition, and elasticity of macroscale. The modeling and analysis of the behavior, therefore, requires the multiscale point of view in that the vast design space of such material cannot be fully exploited otherwise. In this regard, the multiscale behaviors of the nematic solids are first visited, elucidating qualitative behaviors and research of individual physics. Further, the multiscale analysis approach applied to understand and harness the behaviors of the nematic liquid crystalline solids is then reviewed.

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Section: Microscale Lc Behaviorsmentioning

confidence: 99%

Multiscale Phase Behaviors of Nematic Solids: A Short Review

Kim

Lee

et al. 2022

Multiscale Sci. Eng.

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“…Discotic liquid crystals (DLCs) are promising and useful optoelectronic materials for their advantageous properties such as capability of long-range self-assembly, self-healing, and high charge carrier mobilities along the stacking axis in variant columnar mesophases. − Combining the virtues of DLCs with good processability as well as the film-forming and mechanical properties of polymers, side-chain discotic liquid crystalline polymers (SDLCPs) composed of discotic (disc-like) mesogens attached as side groups through flexible spacers constitute a class of fascinating organic semiconducting materials. − Although some impressive examples of SDLCPs have been reported adopting various discotic mesogens (discogens) such as the derivatives of hexabenzocoronene (HBC), − multialkynylbenzene, , perylene, − porphyrin, and phthalocyanine (Pc), − triphenylene (TP) derivatives are among the most extensively investigated and particularly promising discogens attracting persistent attention due to their relative ease in synthesis, chemical stability, and rich mesophases. − Many TP-based SDLCPs have been explored through different polymerization methods with various polymer backbones such as polysiloxane, − poly(methyl)acrylate, − polystyrene, ,− polynorbornene, , conjugated polyacetylene, , and polythiophene. , Among them polyacrylate with moderate flexibility is one of the most preferred backbones for the development of SDLCPs. In recent years, our group has focused on the rational design and controlled synthesis of TP-based polyacrylate SDLCPs via reversible addition–fragmentation chain transfer (RAFT) polymerization for systematically clarifying and revealing some fundamental key issues such as the molecular weight (MW) effect and the spacer length influence of the well-defined SDLCPs. − On the basis of a huge homologous family of polyacrylate SDL...…”

Section: Introductionmentioning

confidence: 99%

Significantly Enhanced Thermotropic Liquid Crystalline Columnar Mesophases in Stereoregular Polymethylenes with Discotic Triphenylene Side Groups

Chen

et al. 2019

Macromolecules

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Side-chain discotic liquid crystalline polymers (SDLCPs) with discotic (disclike) mesogens (discogens) attached as side groups through flexible spacers constitute a class of fascinating organic polymer semiconducting materials. While so far almost all reported SDLCPs belong to conventional C2 polymers based on polymerization of vinyl monomers, limiting their structure diversities, substitution density, and efficiency promotion. In this article we present the synthesis of a series of syndiotactic polymethylene SDLCPs of Pm(TPn) with discotic triphenylene (TP) side groups of variant peripheral alkoxy substituents (n = 6, 4, 10) and different length alkyl spacers (m = 3, 4, 6, 8, 10, 12) through an indirect two-step rhodium-complex-catalyzed C1 carbene polymerization pathway. The thermal properties and ordered organization structures of the precursor polymers and polymethylene SDLCPs have been systematically investigated with differential scanning calorimetry (DSC) and polarized optical microscopy (POM), especially through synchrotron radiation variable-temperature small/wide-angle X-ray scattering (SAXS/WAXS) analyses. All of the series C1-type syndiotactic polymethylenes with high densely substituted TP side groups exhibit various hierarchical ordered columnar mesophases comparable to that of the typical side-chain C2 polymers of well-defined polyacrylates with TP discogens. Moreover, they possess a remarkably broadened temperature range of columnar structures persistent to very high temperatures in virtue of the stiff helical polymethylene backbone. This work provides a feasible route to prepare the C1-type SDLCPs with high densely substituted functional side groups and may offer an in-depth understanding for the hierarchical organization of ordered columnar structures with significantly increased thermal stability.

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“…Spacers are flexible molecular chains parting mesogens or/and acts as linker to the backbone chain in LC which aids their respective motion when signaled by a particular stimulus. Carbon number in spacer also regulates interactions (steric, π-π, or decoupling effect) and phases (columnar or hexagonal) as a function of governing properties in side-chain LC (Figure 2) [17]. These mesogens of LC constitute main chain of thermoplastic or thermosetting units e.g.…”

Section: Introductionmentioning

confidence: 99%

Exploration of elastomeric and polymeric liquid crystals with photothermal actuation: A review

Rastogi

Njuguna

Kandasubramanian

2019

European Polymer Journal

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Recent research in soft materials is an exhilarating category which has been transcending boundaries for variety of functional applications. This category also stems liquid crystals whose stimuli-responsive feature has fantasized researchers for application arrays in actuators and biomedical. Liquid crystals evince dual characteristics of liquid and solids empowering them to reversibly transit on external actuation. The after-effect of irradiating photons on liquid crystals (LC) facilitate outlying functioning and are engineered with gold nanorods, dyes, graphene and carbon nanotubes among others which greets to incoming stimulus and participates in transference of light energy to perceivable transformation through heat drive. This is progressively explored in medical domain for drug delivery, tissue engineering, cancer treatment, and other disciplines of medicine and bio-mimicking. Additionally, photothermal trigger equips localized punctilious treatment outshining diffusion assisted heating and enables spot treatment. However, LC utilization is burgeoning towards 3D printing, dyes ipa graphen sib tals (LC) bly tr quid crysta sit feature ha als nctio as f is an ex pli @gma ail.c manian K J, Un d eering, R ted Kin Rober e, Girinagar, characterizing it as 4D Printing. Present review framework probes LC and its photothermal actuation chemistry in the medical domain. Furthermore, it reflects on LC potential in smart manufacturing in 3D/4D printing, its challenges (limited concentration of filler, its miscibility, and actuation cycle fatigue) and future likelihood.

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Multiple Effects Tailoring the Self-organization Behaviors of Triphenylene Side-chain Liquid Crystalline Polymers via Changing the Spacer Length

Cited by 12 publications

References 45 publications

Multiscale Phase Behaviors of Nematic Solids: A Short Review

Multiscale Phase Behaviors of Nematic Solids: A Short Review

Significantly Enhanced Thermotropic Liquid Crystalline Columnar Mesophases in Stereoregular Polymethylenes with Discotic Triphenylene Side Groups

Exploration of elastomeric and polymeric liquid crystals with photothermal actuation: A review

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