Robert W. Keyes
Physical Review B
The molecular structure of poly (p‐hydroxybenzoic acid) (C6H4COO)x at ambient temperature was determined by x‐ray powder diffraction analysis. The diffraction pattern is explained as a mixture of two orthorhombic phases having the same space group Pbc21 with four C6H4COO chemical repeats in the unit cell and the following cell parameters: a = 7.42 Å, b = 5.70 Å, and c = 12.45 Å for phase I (ρcalc = 1.51 g cm−3); and a = 3.83 Å, b = 11.16 Å, and c = 12.56 Å for phase II (ρcalc = 1.48 g cm−3). The chain conformation is the same in both phases, involving two benzoyl rings staggered by ca. 120° along the chain. Disorder has been considered in the packing of phase I by giving equal occupancy to the two molecules oriented up or down along the c chain axis. ©1995 John Wiley & Sons, Inc. Copyright © 1995 John Wiley & Sons, Inc.
Robert W. Keyes
Physical Review B
Julien Autebert, Aditya Kashyap, et al.
Langmuir
Frank Stem
C R C Critical Reviews in Solid State Sciences
Sang-Min Park, Mark P. Stoykovich, et al.
Advanced Materials