writer：Wang, M.; Bao, W.; Chang, W.; Chen, X.; Lin, B.; Yang, H.*; Chen, E.*
keywords：liquid crystal polymer
source：期刊
specific source：Macromolecules, 2019, 52, 5791-5800.
Issue time：2019年

In recent years, sequence-controlled

side-chain liquid crystal polymers (SCLCPs) have gained extensive

interests because mesogenic units with different lengths and distributions can

form various ordered sequences, which further endow LCP materials with diverse

functions. In this manuscript, a side-chain side-on maleimide-containing

monomer 2,5-bis-(4-butoxy-benzoyloxy)-benzoic acid

6-(2,5-dioxo-2,5-dihydro-pyrrol-1-yl)-hexyl ester (Y1801) and a side-chain end-on styrene-containing monomer 4''-[6-(4-vinyl-phenoxy)-hexyloxy]-biphenyl-4-carbonitrile

(Y1802) are combined in one single

macromolecular chain and orderly polymerized in an alternative

sequence, to form an alternating copolymer Poly(Y1801-alt-Y1802). The chemical structure

and alterative sequence of Poly(Y1801-alt-Y1802) are confirmed by GPC and

NMR techniques. The combination of DSC, POM and WAXS data indicates that

although the side-on homopolymer PY1801

and the end-on homopolymer PY1802

both exhibit nematic phase, their alternating copolymer Poly(Y1801-alt-Y1802)

shows an interdigitated smectic A phase, a compromised molecular arrangement

instead. In addition, a strong fluorescence emission of Poly(Y1801-alt-Y1802) is

observed, which might provide this novel alternating-structured liquid crystal

polymer with potential applications in luminescent materials and devices.