Mesogen-jacketed Liquid Crystal Polymers With Mesogens of Aromatic Amide Structure

Synthesis and Characterization of A New Series of “Mesogen-Jacketed Liquid Crystal Polymers” Based on the Newly Synthesized Vinylterephthalic Acid

“…These results show once more that the large mesogenic substituent on one of the vinyl carbons does not eliminate the polymerizability of the monomers as found in other MJLCP systems. [10][11][12] Although no kinetic study has ever been carried out for this polymerization, the remarkable polymerizability is understandable by presuming a hindered chain termination as disclosed by Otsu et al for the polymerization of 1,2-disubstituted fumarates. 19 Similar to our previous MJLCPs based on 2-vinylhydroquinone 10 or 2-vinyl-1,4-phenylenediamine, 12 these new polymers based on VTA are also noncrystalline.…”

“…[10][11][12] Although no kinetic study has ever been carried out for this polymerization, the remarkable polymerizability is understandable by presuming a hindered chain termination as disclosed by Otsu et al for the polymerization of 1,2-disubstituted fumarates. 19 Similar to our previous MJLCPs based on 2-vinylhydroquinone 10 or 2-vinyl-1,4-phenylenediamine, 12 these new polymers based on VTA are also noncrystalline. The DSC measurements from room temperature to 300 showed only a glass transition step but no endothermic peak correlative to any melting of crystals (Figure 1).…”

“…1,2 According to this model, the spatial requirement of the bulky and rigid mesogenic units causes the main chain of the polymer to take extended and stiffened conformations. The idea has been repeatedly supported by studies of, e.g., Hardouin, 3 Gray,4 Richardson, 5 Schrock, 6 Mauzac, 7 Xu, 8 Zhou, [9][10][11][12] and, most recently, Ober and co-workers. 13 For example, smallangle neutron scattering experiments have shown that the polymer chains have in the nematic phase prolate conformations with a large shape anisotropy.…”

Jacketed polymers: Controlled synthesis of mesogen‐jacketed polymers and block copolymers

“…[6][7][8] Up to now, MJLCPs based on 2,5-disubstituted styrene have been synthesized and investigated. A series of MJLCPs based on 2-vinylhydroquinone (VHQ), 2-vinyl-1,4-phenylenediamine (VPDA), 2-vinylterephthalic acid (VTA), 6,[9][10][11][12][13][14] vinyl terphenyl (VTP), [15][16][17][18] and with oxadiazole, [19][20][21] have been successfully designed and synthesized (see Scheme 1). Most of the mesogenic groups contain functional groups (such as ester or amide links) which rule out some synthetic strategies, such as anionic and cationic polymerization.…”

Synthesis and properties of mesogen‐jacketed liquid crystalline polymers containing bistolane mesogen

“…Different from Finkelmann's principle, Zhou et al19, 20 reported a new class of “mesogen‐jacketed liquid crystalline polymers” (MJLCPs) polyacrylates, in which the “waist” of the side‐chain mesogenic group is laterally attached to the backbone via a short linkage. Furthermore, a lot of MJLCPs without spacers were synthesized, and these polymers formed stable LC phases 21–25. Zhou et al19, 20 found out that when mesogenic units were connected laterally to the main chain through the gravity centers of the mesogens, flexible spacers to decouple the dynamics of main chain and side groups were not needed.…”