POSS-Containing Jacketed Polymer: Hybrid Inclusion Complex with Hierarchically Ordered Structures at Sub-10 nm and Angstrom Length Scales

Abstract

A series of organic−inorganic hybrid polymers, PnPOSS (n = 6, 10, which is the number of carbon atoms in the flexible alkyl spacers), containing a mesogen-jacketed liquid crystalline polymer (MJLCP) as the main chain and a crystalline nanobuilding block, polyhedral oligomeric silsesquioxane (POSS), in the side chains were designed and synthesized for constructing a hybrid inclusion complex. The phase structures and phase transitions of PnPOSS were investigated by differential scanning calorimetry, polarized light microscopy, wide-angle X-ray diffraction, small-angle X-ray scattering, and high-resolution transmission electron microscopy. With the competitive self-assemblies of the two covalently connected building blocks, namely MJLCP and POSS moieties, PnPOSS shows various phase structures including a sub-10 nm hexagonal columnar (Col h ) or columnar nematic liquid crystalline phase, an angstrom rhombohedral crystalline (K R ) phase, and a hierarchically ordered phase with Col h and K R coexisting. This work provides a new approach for the design and synthesis of hybrid inclusion materials.

Reversible Changes in the Grain Structure and Conductivity in a Block Copolymer Electrolyte

“…These peaks correspond to the rhombohedral packing of the POSS moieties. 35,36 The PEO-rich microphase remains amorphous at these temperatures ( Figure S11a Figure 2) and TEM (Figure 4). The effect of crystallinity on ordered microphases in block copolymers is a subject of long-standing interest.…”

Fabrication of dual‐layer poly(styrene‐b‐4‐vinyl pyridine)–poly(vinylidene fluoride) membranes with tailored pore sizes under 10 nm via surface quaternization

“…The casting solution containing PS4VP was prepared with the same method as demonstrated before . Before it was brought into contact with the PS4VP dope solution, the PVDF hollow‐fiber membrane was immersed in the intermediate‐treatment agent 1,4‐dioxane for 5 s to control the extent of the casting solution interpenetration into the porous support layer .…”

Cubic Polyhedral Oligomeric Silsesquioxane Based Functional Materials: Synthesis, Assembly, and Applications

“…[41b] Zhu et al reported as eries of POSS-embedded LC polymers comprising am esogen-jacketedl iquid crystallinep olymer as the main chain and POSS attached as the side chain. [42] Based on 1D and 2D wide-angle X-ray diffractiona nd temperaturedependents ynchrotron-radiation small-angle X-ray scattering experiments, P5 with n = 10 acted as as upramolecular rod-like mesogen and exhibited a2 Dh exagonal columnar (Col h )p hase. In the columnar assembly,t he polystyrene polymerb ackbone was envisaged to stay in the center with the POSS pendants staggered around the periphery,p resumably formingahelixlike structure.…”

“…Zhu et al reported a series of POSS‐embedded LC polymers comprising a mesogen‐jacketed liquid crystalline polymer as the main chain and POSS attached as the side chain . Based on 1D and 2D wide‐angle X‐ray diffraction and temperature‐dependent synchrotron‐radiation small‐angle X‐ray scattering experiments, P5 with n =10 acted as a supramolecular rod‐like mesogen and exhibited a 2D hexagonal columnar (Col h ) phase.…”