Synthesis of POSS-functionalized liquid crystalline block copolymersviaRAFT polymerization for stabilizing blue phase helical soft superstructures

Abstract

A study of the phase transition behaviors of blue phase liquid crystals containing different amounts of POSS-functionalized LC BCPs.

Polyhedral Oligomeric Silsesquioxane Hybrid Polymers: Well‐Defined Architectural Design and Potential Functional Applications

“…Recently, PHEMAPOSS‐ b ‐P6CBMA (POSS‐LC BCPs) 23 with the same PHEMAPOSS block length and different P6CBMA block length have been proposed by Zhang et al By incorporating different ratios of POSS‐LC BCPs with a block containing blue phase liquid crystal groups, the electro‐optical (E‐O) property of the BP has been greatly improved.…”

“…For instance, Zhang et al have proposed a series of functionalized side chain POSS macromolecules via RAFT polymerization, in which PHEMAPOSS is functionalized as the RAFT agent by polymerizing a POSS‐functionalized monomer (HEMAPOSS). By properly controlling PHEMAPOSS length and adjusting the second kind of monomer, sidechain POSS polymers, such as PHEMAPOSS‐ b ‐PDMAEMA 21 , PHEMPOSS‐ b ‐PMAA 22 , PHEMAPOSS‐ b ‐P6CBMA 23 , and PHEMAPOSS‐ b ‐P(DMAEMA‐ co ‐CMA) 24 ,34b have been successfully designed and synthesized for applications in stimuli‐responsive behaviors, self‐assembly, liquid crystals, and controllable drug release. The chemical structure of PHEMAPOSS‐ b ‐PMAA and self‐assembly behaviors in water with different lengths of hydrophilic PMAA moiety are shown in Figure b .…”

Progress in the self-assembly of organic/inorganic polyhedral oligomeric silsesquioxane (POSS) hybrids

“…136 Interestingly, Zhang et al used RAFT polymerization and doping to synthesize various POSS-functionalized liquid-crystalline PHEMAPOSS- b -P6CBMA BCPs, with the POSS unit and the mesogenic cyanobiphenyl block stabilizing blue-phase liquid crystals (LCs). The doped LC BCP materials had a lower hysteresis and driving voltage, excellent thermal stability, and a higher value of Kerr constant K. 137 The Dai group used ATRP to prepare stimuli-responsive PEG- b -P(MAPOSS- co -DPA) polymeric systems. This series of POSS-based amphiphilic copolymers formed spherical micelles with a core–shell structure, with average diameters in the range 158–223 nm, based on TEM imaging and dynamic light scattering (DLS) (Fig.…”

Inducing enantioselective crystallization with and self‐assembly of star‐shaped hybrid polymers prepared via “grafting to” strategy

“…The introduction of POSS can afford the hybrid materials significant improvement of thermostability, mechanical property, flammability resistance, and so forth. [34][35][36] What is more, POSS compounds with functional groups can be used as the core to prepare starshaped polymers via "grafting from" or "grafting to" strategy. For example, Yang et al 37 prepared POSS-based redox-responsive star-shaped polymers using "grafting from" method by the atom transfer radical polymerization of (2-dimethylamino)ethyl methacrylate with bromide-modified POSS as the initiator.…”

“…These functional POSS moieties can be facilely incorporated into polymers to prepare organic‐inorganic hybrid materials. The introduction of POSS can afford the hybrid materials significant improvement of thermostability, mechanical property, flammability resistance, and so forth 34–36 . What is more, POSS compounds with functional groups can be used as the core to prepare star‐shaped polymers via “grafting from” or “grafting to” strategy.…”