Phase and orientational behaviors in liquid crystalline main-chain/side-group block copolymers

Fully Liquid-Crystalline ABA Triblock Copolymer of Fluorinated Side-Chain Liquid-Crystalline A Block and Main-Chain Liquid-Crystalline B Block: Higher Order Structure in Bulk and Thin Film States

“…A few BCPs consisting of MCLCPs and SCLCPs have been reported, and those LC structures and phase transitions were individually observed by wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC), respectively. The results indicated segregation of the MCLCP and SCLCP blocks, although a clear segregated domain structure was not observed. , …”

Intriguing three-component four-layer stacking nanostructures formed by the self-assembly of main-chain liquid-crystalline polyurethane elastomers, as analyzed by two-dimensional small-angle X-ray scattering

“…According to the chemical structure of the main-chain LC polymer used in this study (Scheme 1), it is classied as a multiblock-type copolymer. Although the simplest chemical structure is a diblock copolymer comprising an LC and another moiety, 32,33 this simplest structure does not cause the same level of physical constraint as a main-chain LC polymer, wherein both ends of the mesogenic unit are chemically bonded to amorphous moieties. In this regard, the physical constraint is comparatively intense in the case of an ABA-type triblock copolymer.…”

“…Although there are many studies reporting the results of 2D-SWAXS measurements for the case of the side-chain-type LC block copolymers, [41][42][43][44][45][46][47] the number is limited for the literature reporting the case of main-chain LC polymers. [32][33][34][35][36][37][38][39][40] Briey summarizing the literature on triblock copolymers [32][33][34][35][36][37][38][39][40] or oriented main-chain LC polymers subjected to shear or magnetic elds, [48][49][50] several reection peaks are observed in the SAXS region, highly aligned in the direction parallel to the ber axis or the direction of the applied eld, while the signals concerning the ordering and spacing of mesogenic units can be observed directly in the wide-angle X-ray scattering (WAXS) region. The reection peaks in the SAXS region are ascribed to the nanostructure; therefore, the morphology, such as the lamellar structure of the smectic C (SmC) phase, can be analyzed, as well as quantitative determination of the repeating periodicity of the layers.…”

The Influence of Annealing Atmosphere, Blending Ratio, and Molecular Weight on the Phase Behavior of Blend Materials

“…In order to obtain rich micro-region Processes 2021, 9, 1586 2 of 9 morphology of self-assembled block copolymers, researchers control and adjust the relevant process conditions to achieve this goal. For example, a temperature field [12,13], temperature gradient field [14,15], solvent field [16][17][18][19][20], shear field [21][22][23], magnetic field [24][25][26][27][28], and electric field [29][30][31] can be applied to control the morphology of self-assembled block copolymers. Both industry and academia have conducted a great deal of research into the morphology of field-regulated block copolymers.…”