Polymer Liquid Crystals

(page under construction)

Selected publications:

G Ungar, J L Feijoo, "Simultaneous X-ray diffraction and differential scanning calorimetry (XDDSC) in the study of molecular and liquid crystals", Molec. Cryst. Liq. Cryst. 1990 180B 281-291

.G Ungar, J L Feijoo, A Keller, R Yourd, V Percec, "A simultaneous X-ray/DSC study of mesomorphism in polymers with a semi-flexible mesogen", Macromolecules 1990 23 3411-3417

.J L Feijoo, G Ungar, A Keller, V Percec, "Non-equilibrium excess order in the isotropic state of main chain liquid crystal forming polymers", Polymer 1990 31 2019-2022

.G Ungar, J L Feijoo, V Percec, R Yourd, "Liquid crystalline polyethers based on conformational isomerism. 16. Hexagonal columnar phase in a non-discotic copolyether based on 1,2-bis(4-hydroxyphenyl)ethane, 1,8-dibromooctane and 1,12-dibromododecane, and the novel 2-dimensional - 3-dimensional Fh-SB transition", Macromolecules, 1991 24 953-958

J L Feijoo, G Ungar, A Keller, J A Odell, A J Owen, V Percec, "Evidence for disclinations in the isotropic state of liquid crystal forming polymers", Mol. Cryst. Liq. Cryst., 1991 196 1-11

.G Ungar, V Percec, R Rodenhouse, "Liquid crystal polymers containing macroheterocyclic ligands. 5. Structure of liquid crystal phases of poly([4-(11-methacryloylundecan-1-yloxy)-4'-(4'carboxybenzo-15-crown-5)biphenyl]", Macromolecules, 1991 24 1996-2002

.G Ungar, V Percec and M Zuber, "Liquid crystalline polyethers based on conformational isomerism: 20. Nematic-nematic transition in polyethers and copolyethers based on 1-(4-hydroxyphenyl)-2-(2-R-4-hydroxyphenyl)ethane with R = F, Cl and CH3 and flexible spacers containing an odd number of methylene units", Macromolecules, 1992 25 75-80

S Rastogi and G Ungar, "Hexagonal columnar phase in 1,4-t-polybutadiene: lamellar thickening, chain extension and isothermal phase reversal", Macromolecules, 1992 25 1445-1452

.V Percec, M Lee, J Heck, H Blackwell, G Ungar and A Alvarez-Castillo, "Re-entrant isotropic phase in a supramolecular disc-like oligomer of 4-[3,4,5-tris[4(n-dodecanyloxy)benzoyloxy]-4'-[(2-vinyloxy)ethoxy]biphenyl", J. Mater. Chem., 1992 2 931-938

G Ungar, "Hexagonal columnar phases in polymers", Prog. Colloid Polym. Sci., 1992 87 53-56

.J A Odell, G Ungar and J L Feijoo, "A rheological, optical, and xray study of the relaxation of orientation of nematic PBZT", J. Polym. Sci., Polym. Phys. Ed. 1993 31 141155

.J L Feijoo, G Ungar and V Percec, "Superheating of the nematic phase in main chain polymers", Mol. Cryst. Liq. Cryst., 1993 231 129-135

.G Ungar, J Zhou, V Percec and P Chu, "Nematic, smectic and columnar phases of main-chain liquid crystal polyethers", Makromol. Chem., Makromol. Symp., 1995 98 951-966

.V Percec, D Schlueter, JC Ronda, G Johansson, G Ungar and JP Zhou, "Tubular architectures from polymers with tapered side-groups. Assembly of side-groups via a rigid helical chain conformation and flexible helical chain conformation induced via assembluy of side-groups", Macromolecules 1996 29 1464-1473

.V Percec, A D Asandei and G Ungar, "From regioirregular linear main chain liquid crystal polyethers exhibiting two uniaxial nematic phases to macrocyclic main chain oligoethers displaying nematic and smectic phases", Chem. Mater. 1996 8, 1550-1557

.V Percec, D Schlueter and G Ungar, "Rational design of a hexagonal columnar mesophase in telechelic alternating multicomponent semifluorinated polyethylene oligimers", Macromolecules, 1997 30 645-648

.A Ezquerra, M Sanchez-Cuesta, G Ungar, JL Feijoo and E Lopez-Cabarcos, "Phase behaviour of a substituted poly(paraphenylene): Poly(para-2,5-didecylphenylene)", J. Polym. Sci., Polym. Phys., 1998 36 49-54

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