Effects of monomer structures on the evolution of liquid-crystal texture and crystallization during thin-film polymerization

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

“…For the single monomer systems, as mentioned above, ABA itself polymerized easily to form a beautiful Schlieren texture at low temperatures, as reported previously; 33 other single monomers could not form the LC phase. For the two-monomer systems, LC phase was observed in ABA/AAA system but not in ABA/DABP, ABA/TDA, DABP/TDA, AAA/TDA, and BP/TDA systems.…”

“…It can be seen that there is no great difference in their morphological changes from those systems studied previously, which showed liquid crystallinity. 33,[36][37][38] For different polymerization systems of LCPs studied here with various monomer compositions and at different temperatures, there were some differences in their morphological changes. However, the appearance of LC phase and annihilation of disclinations were observed for all systems.…”

“…While ABA itself polymerized easily to form beautiful Schlieren texture at low temperatures, 33 the monomers AAA and TDA do not have liquid-crystallinity themselves. The two-monomer systems, ABA/AAA, ABA/ TDA, and AAA/TDA, were also examined at 380°C, but no liquid-crystal phase was found in ABA/TDA and AAA/TDA systems.…”

Preparation and properties of Mahua oil‐based liquid crystalline pentalkyds

“…As seen in the DSC plots of Figure 5, glass transition temperature (Tg) of the LC alkyds was higher than the amorphous ones. The presence of rigid segments of mesogens ( p ‐HBA) in LC resins, which restricts the segmental motion of the main chains,24 explains the higher Tg of LC alkyds.…”

Dynamic Responses of a Thermotropic Main-Chain Liquid Crystalline Polyester during Polymerization under Electric Fields

“…To investigate the effect of electric fields on the polymerization of LCP, we compared polymerizations with and without electric fields. For the thin-film polymerization without electric fields, we have reported the results in detail in our previous papers. − Here, we only briefly summarize the morphological changes. Figure shows the micrographs of a 73/27 ABA/ANA polymerization system with a reactant thickness of ∼10 μm.…”