Abstract
Five samples of cellulose, with different polymerization degrees, were used to obtain corresponding trimethylsilylcellulose derivatives by reaction with trimethylchlorsilan. The trimethylsilylcellu -lose (TMSC) samples were characterized in solution by osmometry, viscometry and gel permeation chromatography. The Mark-Houwink-Sakurada (M-H-S) equation coefficients were determined in chloroform, 1, 1, 1-trichloroethane and o-xylene, in all cases the exponent “a” being higher than 10, indicating great stiffness of the macromolecules in solution. Also, the temperature dependence of both the limiting viscosity number and M-H-S coefficients for TMSC in o-xylene were studied. The exponent from M-H-S equation is also higher than 1. 0 and increases linearly with the tern -perature. The GPC studies indicate a relatively high polydispersity of the studied samples; the polydispersity index being situated between two and three.
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