Abstract
A polydisperse pullulan (PUL) sample was hydrophobically modified by nonenyl succinic anhydride (NSA) with four different degree of substitution (DS) samples (PUL-NSA). Small-angle X-ray scattering functions and pyrene-probe fluorescence were measured for PUL-NSA samples in 0.05 M aqueous NaCl. Both the SAXS and fluorescence results can be explained by the loose flower necklace model well. The SAXS results of PUL-NSA was different from that of the random copolymer of octenyl succinic anhydride hydrophobically modified PUL (PUL-OSA) with approximate DS. The stiffness of the flower necklace qFN for PUL-NSA was lower than PUL-OSA, probably due to the differences in the alkyl chain length.
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