chain gives rise to the false meridional streaks, the equivalent to diffuse scattering in single chain of is crystals with correlated fluctuations. The molecular poly-9-hydroxynonanoate determined to possess a planar zigzag conformation. Two of such chains are arranged within an orthorhombic unit cell with lattice parameters, = 7.47 ± 0.02 Å, = 5.00 ± 0.02 Å, = a b c 12.37 ± 0.02 Å, very similar to those of polyethylene, = 7.40 ± 0.02 = 4.93 ± 0.02 a Ǻ, b Ǻ, c = 2.53 ± 0.02 The space group is determined to be Pnam. The angle between the C-C-C... Ǻ. zigzag plane of and the is determined to be 32.7°. Torsion of b-axis poly-9-hydroxynonanoate the carbonyl group at this particular angle between the C-C-C... zigzag plane of and the is determined to be 0°. b-axis The diffraction pattern shows sharp non-equatorial equatorial reflections and a series of reflections on the layer line, although one could confuse it with the 5th layer line due to the presence of noncrystallographic meridional Hitherto a space group for an aliphatic streaks of periodicity of 12 Å. this is the first time that polyester of the type [-(CH2)n-CO-O-]x with an even number of methylene units between successive ester groups is determined because is the first to show poly-9-hydroxynonanoate Bragg reflections on the non-equatorial layer line. In all previous cases studied there were no non-zero layer lines on the diffraction patterns and hence no space group could be determined. In fact, all previous polymers of the type [-(CH2)m-CO-O-]n, with an even number of methylene units between successive ester groups, had no three-dimensional long range order but only two-dimensional and this is why, theoretically, they could be considered as columnar liquid crystals.
chain gives rise to the false meridional streaks, the equivalent to diffuse scattering in single crystals with correlated fluctuations. The molecular chain of poly-9-hydroxynonanoate is determined to possess a planar zigzag conformation. Two of such chains are arranged within an orthorhombic unit cell with lattice parameters, a = 7.47 ± 0.02 Å, b = 5.00 ± 0.02 Å, c = 12.37 ± 0.02 Å, very similar to those of polyethylene, a = 7.40 ± 0.02 Ǻ, b = 4.93 ± 0.02 Ǻ, c = 2.53 ± 0.02 Ǻ. The space group is determined to be Pnam. The angle between the C-C-C... zigzag plane of poly-9-hydroxynonanoate and the b-axis is determined to be 32.7°. Torsion of the carbonyl group at this particular angle between the C-C-C... zigzag plane of and the b-axis is determined to be 0°. The diffraction pattern shows sharp equatorial reflections and a series of reflections on the non-equatorial layer line, although one could confuse it with the 5th layer line due to the presence of noncrystallographic meridional streaks of periodicity of 12 Å. Hitherto this is the first time that a space group for an aliphatic polyester of the type [-(CH2)n-CO-O-]x with an even number of methylene units between successive ester groups is determined because poly-9-hydroxynonanoate is the first to show Bragg reflections on the non-equatorial layer line. In all previous cases studied there were no non-zero layer lines on the diffraction patterns and hence no space group could be determined. In fact, all previous polymers of the type [-(CH2)m-CO-O-]n, with an even number of methylene units between successive ester groups, had no three-dimensional long range order but only two-dimensional and this is why, theoretically, they could be considered as columnar liquid crystals.
Tadjiev,_Timur.docx