Neutron scattering from PEEK |
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| Authors: | B Hammouda D G Reichel C J Wolf |
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| Institution: | 1. Research Reactor Facility and Department of Physics , The University of Missouri , Columbia, Missouri, 65211;2. McDonnell-Douglas Research Labs , Box 516, Saint Louis, Missouri, 63166 |
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| Abstract: | An alkali‐soluble polysaccharide, GM5‐1, from the mycelium of Ganoderma tsugae, was fractionated by the nonsolvent addition method. The weight‐average molecular mass (M w) and intrinsic viscosity (η]) of fractions were studied by laser light scattering and viscometry with dimethylsulfoxide (DMSO) containing 0.25M LiCl (0.25M LiCl/DMSO) as the solvent at 30°C. The dependences of η] and the radius of gyration (?S 2?z 1/2) on M w were found to be η]=9.8×10?2 M w 0.57 (cm3g?1) and ?S 2?z 1/2=1.65×10?2 M w 0.58 (nm) in the M w range from 8.6×105 to 2.6×106. The analysis based on current theories for a wormlike chain showed that the chain conformational parameters of GM5‐1 were 4.2 nm for persistence length (q) and 833 nm?1 for linear mass density (ML) with an obvious excluded volume effect. The results suggested the alkali‐soluble polysaccharide behaves like a semiflexible chain in 0.25M LiCl/DMSO at 30°C. |
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| Keywords: | Ganoderma tsugae polysaccharide molecular mass intrinsic viscosity light scattering |
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