作者：Wang, M.; Jin, H.; Chen, X.; Lin, B.; Yang, H.*
关键字：liquid crystal polymer
论文来源：期刊
具体来源：Polymer Chemistry, 2019, 10, 3657-3664.
发表时间：2019年

In

recent years, click chemistry has drawn intense research attention for the fabrication

of main-chain liquid crystal polymers (MCLCPs) because of its vast technical

advantages, such as ease of operation, green processes, atomic economy and high

reaction yields. However, current click chemistry approaches (thiol-ene,

thiol-yne and azide-alkyne polyadditions) and all other previous

polycondensation methods have to prepare liquid crystal (LC) monomers first and

then link LC monomers together to give the designed MCLCPs, efficient synthesis

and rapid screening of novel MCLCP materials are still challenging. In this

manuscript, a series of fluorosulfate-functionalized monomer and aryl silyl

ether-containing monomers are polymerized via

the newly-emerged sulfur(VI) fluoride exchange (SuFEx) click chemistry

reaction, to form four MCLCPs P1, P2, P3 and P4, bearing

sulfate ester groups in the polymer backbones. The chemical structures of these

monomers and MCLCPs are confirmed by GPC and NMR techniques. The combination of

DSC, POM and WAXS data indicates that although most of the monomers lack of

liquid crystallinity, their corresponding MCLCPs all exhibit LC phases. P1 and P3 have a nematic phase with a smectic fluctuation, while P2 and P4 show a nematic phase. Compared with all the previous

polycondensation routes which must synthesize mesogenic monomers first and then

prepare the corresponding MCLCPs, this novel SuFEx click chemistry strategy can

synthesize MCLCP products from two orthogonal non-LC monomer groups, which

might provide a new perspective for efficient synthesis and rapid screening of

novel MCLCP materials.