Competition of Lamellar Crystal and Smectic Liquid Crystal in Precise Polyethylene Derivative Bearing Mesogenic Side-Chains

Thermo‐Induced Bathochromic Emission in Columnar Discotic Liquid Crystals Realized by Intramolecular Planarization

“…[1][2][3][4][5][6] Fluorescent liquid crystal (LC) materials are effective assets in this aspect by combining remarkable solid-state light emission and thermotropic polymorphic molecular order. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] To induce the formation of stable LC phases, various secondary interactions among the mesogenic fluorophores are usually introduced, which tends to cause intermolecular electronic coupling and as a result leads to excimer emission in the ordered LC solid. [23][24][25][26][27][28][29][30][31] As excimer emission is usually sensitive to temperature, most of the fluorescent LCs exhibit blue-shifted emission upon increasing temperature due to the transition from excimer to monomer emission.…”

“…Thermochromic fluorescent materials exhibit remarkable emission color change in response to temperature, and such materials have been widely explored because of their potential for applications in data storage, temperature sensors, and optoelectronic devices [1–6] . Fluorescent liquid crystal (LC) materials are effective assets in this aspect by combining remarkable solid‐state light emission and thermotropic polymorphic molecular order [7–22] . To induce the formation of stable LC phases, various secondary interactions among the mesogenic fluorophores are usually introduced, which tends to cause intermolecular electronic coupling and as a result leads to excimer emission in the ordered LC solid [23–31] .…”

Relaxations of Entropically Stressed Polymer Glasses

“…When the conformation of polymer chains deviates from the equilibrium Gaussian statistics, a recovery force of entropic origin emerges to restore the high-entropy conformation. − In case the nonequilibrium conformations are maintained in a vitrified matrix, frozen-in entropic stress builds up, and this modifies polymer dynamics. − Entropic stress (σ es ) is ubiquitous in polymer materials, which are usually prepared under nonequilibrium processing conditions − and are even symbiotic with the high performance of oriented polymer materials, such as fibers and stretched films. , Unravelling the impacts of the entropic stress on the polymer dynamics and the kinetic pathway toward more stable, less energetic states in entropically stressed (ES) polymers may reveal useful information about the nonequilibrium dynamics of long-chain molecules and on the microscopic understandings of the mechanical behavior of oriented macromolecular glasses.…”

“…4−10 Entropic stress (σ es ) is ubiquitous in polymer materials, which are usually prepared under nonequilibrium processing conditions 4−13 and are even symbiotic with the high performance of oriented polymer materials, such as fibers and stretched films. 14,15 Unravelling the impacts of the entropic stress on the polymer dynamics and the kinetic pathway toward more stable, less energetic states in entropically stressed (ES) polymers may reveal useful information about the nonequilibrium dynamics of longchain molecules and on the microscopic understandings of the mechanical behavior of oriented macromolecular glasses.…”

Synthesis and Phase Behavior of (Semifluorinated Alkane)‐Based Side‐Chain Liquid Crystalline Copolymers

“…In addition to the strong segregation tendency between aromatic, fluorocarbon, and hydrocarbon components, the low grafting density and also the precise placement of mesogenic side‐chain makes the formation of novel self‐assembly structures possible. [ 43–46 ] Owing to the well‐defined chemical structures and complex interactions between microblocks, this series of SCLCPs can develop nematic, smectic (Sm), and a possible three‐dimensional (3D) tetragonal LC phase. Our results provide a new strategy for the structural design toward well‐defined SCLCP materials, and also broaden the horizon of the remarkable influence of perfluorinated segments on LC phase behaviors.…”