Self-assembly, liquid crystalline behavior and electrorheological performance of phthalocyanine-contaning polysiloxanes

Li, Xin; Chang, Xiaolong; Zheng, Xin-Qiang; Kong, Weiwei; Zhuang, Yanxin; Yan, Guiyang; Meng, Fanbao

doi:10.1016/j.eurpolymj.2021.110417

Cited by 4 publications

(3 citation statements)

References 58 publications

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“…Combining silica and polysiloxane networks with a liquid crystalline template serves as a framework for various mesoporous materials. − On the other hand, the high flexibility of linear polysiloxanes induces an amorphous state at room temperature. Linear polysiloxanes are used in oils, greases, and shampoos. − Moreover, introducing side chains with a high aggregation ability forms a self-assembled nanostructure of linear polysiloxanes at or above room temperature. − A similar phenomenon is observed in the case of block copolymers. , …”

Section: Introductionmentioning

confidence: 81%

Humidity-Induced Self-Assembled Nanostructures via Ion Aggregation in Ionic Linear Polysiloxanes

et al. 2022

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Polysiloxanes exhibit practical properties not observed in carbon or carbon−oxygen backbone polymers. Linear ionic polysiloxanes containing an amine hydrochloric salt exhibit a humidity-induced self-assembly (HiSA) behavior. HiSA leads to nanoscale structuring by the uptake of absorbed water around the ionic aggregates of the polymer, promoting the hydrophilic−hydrophobic phase separation of the polymer. The resulting polymer forms a self-assembled lamellar nanostructure with a period of ca. 1.6 nm. Herein, we investigate the factors affecting the HiSA behavior. Introducing a dimethylsiloxane unit into the ionic polysiloxane achieves a more ordered lamellar structure and improves the nanostructure stability at higher humidities. The flexibility of the polysiloxane backbone, formation of ionic aggregates, and hydrophilic−hydrophobic phase separation affect the HiSA behavior. This nanoscale assembly can be characterized as a lyotropic liquid crystal formed with the assistance of ion aggregation instead of the hydrophobic effect in aqueous systems of ordinary surfactants.

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Section: Introductionmentioning

confidence: 81%

Humidity-Induced Self-Assembled Nanostructures via Ion Aggregation in Ionic Linear Polysiloxanes

et al. 2022

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“…Kuznetsov et al 11,12 made a new ER fluid based on chitosan particles in 2021. Meanwhile, Dhar et al 13 used agarose to make an organic colloidal ER fluid, and Meng et al 14 successfully made ionic liquid-crystalline polysiloxane-based ER fluids. In 2018 Sedlacik et al 15 made iron( ii ) oxalate particles with a special shape, where the particles had an extremely respectable aspect ratio with their length of ranging from 15 to 30 μm and thickness ranging from 1 to 2 μm.…”

Section: Introductionmentioning

confidence: 99%

Enhanced response of titanium doped iron(ii) oxalate under electric field

Chen

et al. 2022

RSC Adv.

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“…6 Polymerization of ILCs results in the formation of polymerized ionic liquid crystals (PILCs), which can provide a facile entry into overcoming the ILCs' problems such as low viscosity, easy deformations, and low mechanical properties. Many PILCs exhibiting good thermostability, excellent mechanical strength, and high viscosity have been proposed by use of various polymer mainchains such as polystyrene, 7 polypyrrole, 8 polypyrindine, 9 poly(phenyl benzoate), 10 polysiloxane, 11 poly(ethylene glycol), 12 poly(vinylpyridine), 13 polyoxometalate, 14 and so forth. Moreover, PILCs can present a greater variety of liquid-crystalline order than ILCs.…”

mentioning

confidence: 99%

Self‐assembly, mesomorphic behavior, and ionic conductivity of polymerized ionic liquid crystals with a threshold switching characteristic

Tang

Chang

Zhu

et al. 2022

Polymers for Advanced Techs

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A series of pyridinium‐based polymerized ionic liquid crystals (PILCs) with different anions were synthesized, including poly(pyridinium bromide)s and poly(pyridinium trifluoroacetate)s, and their chemical structure, liquid‐crystalline properties and conductivity properties were investigated by many experimental techniques. At low temperature, some PILCs containing less cholesteryl mesogens presented smectic A phases; while the PILCs containing more cholesteryl mesogens displayed bicontinuous cubic phases. At high temperature, all the PILCs showed nematic phases. Compared with the corresponding poly(pyridinium bromide)s based on identical polymer cations, the poly(pyridinium trifluoroacetate)s showed lower glass transition and isotropic transition temperature. The PILCs displayed excellent temperature‐dependent ionic conductivity, making it attractive for applications in temperature‐controlled electronic switches. In cubic and smectic A phases, the PILCs presented Arrhenius‐like ionic conductivity behavior, and they exhibited Vogel–Fulcher–Tammann‐like behavior in nematic phases.

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Self-assembly, liquid crystalline behavior and electrorheological performance of phthalocyanine-contaning polysiloxanes

Cited by 4 publications

References 58 publications

Humidity-Induced Self-Assembled Nanostructures via Ion Aggregation in Ionic Linear Polysiloxanes

Humidity-Induced Self-Assembled Nanostructures via Ion Aggregation in Ionic Linear Polysiloxanes

Enhanced response of titanium doped iron(ii) oxalate under electric field

Self‐assembly, mesomorphic behavior, and ionic conductivity of polymerized ionic liquid crystals with a threshold switching characteristic

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