Abstract
The conformation of two regio-selectively substituted cellulose esters, cellulose propionate diacetate (CPDA, 2, 3-di-O-acetyl-6-O-propionyl cellulose) and cellulose acetate dipropionate (CADP, 6-0-acetyl-2, 3-di-O-propionyl cellulose), has been investigated through X-ray and electron diffraction methods. CPDA crystallizes forming an orthorhombic unit cell with dimensions a=1.358nm, b=2.221nm and c (fiber axis)=1.044nm. The unit cell of CPDA has three sets of twofold screw axes parallel to the three orthogonal crystallographic axes, and the space group of CPDA is most likely P212121. On the other hand, CADP crystallizes as a monoclinic unit cell with dimensions a=1.108nm, b=1.536nm, c (fiber axis)=1.500nm and γ=90°. CADP has a threefold screw symmetry along the molecular axis as does cellulose tripropionate (CTP). The space group is P21 with b as the unique axis.
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