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Four kinds of rigid and semiflexible ring polymers are synthesized from flexible cyclic amylose. Their conformational properties in dilute solution are determined from dimensional and hydrodynamic properties in terms of the wormlike ring model. The helix rise per residue h of some ring polymers is larger or smaller than that for the corresponding linear chains, indicating that the local helical structure...
Seven linear amylose tris(n-octadecylcarbamate) (ATODC) samples ranging in the weight-average molar mass Mw from 2.4 × 104 to 1.5 × 106 g mol−1 and their seven cyclic analogues (cATODC) of which Mw are from 3.6 × 104 to 1.9 × 105 g mol−1 were prepared to characterize their conformation in tetrahydrohuran (THF), in 2-octanone (MHK), and in tert-butyl methyl ether (MTBE). Light and small-angle X-ray...
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