Abstract
Small angle elastic neutron scattered intensity l( q) by dilute solutions of a high molecular weight and low charge density carboxymethylcellulose (CMC) in D 2O, without added-salt has been measured. The variation of l( q) is proportional to q −2 ( q = momentum transfer) for q < q∗, and to q −1 for q > q∗. The dependence on q −2 shows that the distribution of the statistical units is Gaussian whereas the existence of q∗ provides the possibility of calculating the length of such a unit; according to the dependence on q −1, we conclude that these units are rigid. The length increases with dilution and charge density, which agrees with our previous results obtained by viscosity.
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