TY - GEN
T1 - Discotic liquid crystals
T2 - Liquid Crystals XII
AU - Lam, Jacky Wing Yip
AU - Xing, Changmin
AU - Zhao, Keqing
AU - Tang, Ben Zhong
PY - 2008
Y1 - 2008
N2 - Triphenylene-containing poly(1-decyne)s with different alkyl chain lengths are synthesized and the effects of the structural variables on their mesomorphic properties are investigated. The monomers [HC≡C(CH2) 8CO2C18H6(OCm H2m+1)5; m = 4-9] are prepared by consecutive etherization, coupling, and esterification reactions. The monomers form columnar phases at room temperature. The polymerizations of the monomers are effected by [Rh(nbd)Cl]2, producing soluble polymers in high yields (up to 84%). The structures and properties of the polymers are characterized and evaluated by IR, NMR, TGA, DSC, POM, and XRD analyses. All the polymers are thermally stable, losing little of their weights when heated to 300°C. The isotropization temperature of the polymers increases initially with the length of alkyl chain but decreases on further extension. Whilst the polymers with shorter and longer alkyl chain lengths adopt a homogeneous hexagonal columnar structure, those with intermediate ones form mesophases with mixed structures.
AB - Triphenylene-containing poly(1-decyne)s with different alkyl chain lengths are synthesized and the effects of the structural variables on their mesomorphic properties are investigated. The monomers [HC≡C(CH2) 8CO2C18H6(OCm H2m+1)5; m = 4-9] are prepared by consecutive etherization, coupling, and esterification reactions. The monomers form columnar phases at room temperature. The polymerizations of the monomers are effected by [Rh(nbd)Cl]2, producing soluble polymers in high yields (up to 84%). The structures and properties of the polymers are characterized and evaluated by IR, NMR, TGA, DSC, POM, and XRD analyses. All the polymers are thermally stable, losing little of their weights when heated to 300°C. The isotropization temperature of the polymers increases initially with the length of alkyl chain but decreases on further extension. Whilst the polymers with shorter and longer alkyl chain lengths adopt a homogeneous hexagonal columnar structure, those with intermediate ones form mesophases with mixed structures.
KW - Conjugated polymers
KW - Discotic liquid crystals
KW - Liquid crystalline polymers
KW - Polyacetylenes
KW - Triphenylene
UR - https://www.webofscience.com/wos/woscc/full-record/WOS:000262711100015
UR - https://openalex.org/W1986037768
UR - https://www.scopus.com/pages/publications/55549121957
U2 - 10.1117/12.792721
DO - 10.1117/12.792721
M3 - Conference Paper published in a book
SN - 9780819472700
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Liquid Crystals XII
Y2 - 11 August 2008 through 12 August 2008
ER -