Novel thin-film polymerization and time evolution of liquid crystal texture during polymerization

Configuration effects of ortho, meta, and para linkages on liquid crystallinity during thin-film polymerization of poly(ester-amide)s

“…After the appearance of the LC phase, the sizes of LC domains quickly increase, and the domains coalesce to each other. 10,11 At the same time annihilation between disclinations (defects) occurs to release the excess free energy, 10 -16 thus the number of defects in the system decreases. A typical example of the annihilation process is indicated by the circles from 350 s to 356 s in Figure 3.…”

Synthesis and properties of liquid crystalline polymers with low Tm and broad mesophase temperature ranges

“…Since the melt polymerization of thermotropic LCP transitions from a homogenous phase to a heterogeneous system due to the separation of the liquid crystal (LC) phase from the isotropic melt, different LC textures associated with different defects can be observed [17]. The synthesis conditions can affect the LC texture and morphology, which determine the properties of final products.…”

Aromatic liquid-crystalline polyesters comprising a 2,5-thiophene unit synthesized and studied by the thin-film polymerization method

“…While BP was purchased from Aldrich (Aldrich Chemical Co., Inc., Milwaukee, WI) and used as received, ABA, ANA, AAA, and DABP were acetylated from p-hydroxybenzoic acid (p-HBA), (Ueno Fine Chemicals Industry, Ltd., Osaka, Japan), 6-hydroxy-2-naphtholic acid (HNA), (Ueno Fine Chemicals Industry, Inc.), p-aminophenol (Aldrich Chemical Co., Inc.), and BP, respectively, according to literature reports. [32][33][34] The success of acetylation was confirmed by the compound's 1 H nuclear magnetic resonance (NMR) spectra.…”