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Effect of moisture and molecular weight.(New Developments in the Melt Rheology of Nylons (Part...

By Day, E.D.; Han, P.K.; Khanna, Y.P.
Publication: Polymer Engineering and Science
Date: Monday, July 15 1996

Peculiar observations on the melt rheology of ultra-dry nylon resins, nylon 6 in particular, are reported. One aspect of this study deals with a sharp increase in zero shear melt viscosity (e.g. 2 to 5 times) as the nylon 6 resin moisture is taken from 0.10 down to 0.00%; the effect being reversible. Changes of such magnitude are unexpected considering that there are no detectable variations of the chemical/ compositional/molecular weight type in the starting resin, when subjected to the imposed drying conditions. Another aspect of this study deals with a deviation of nylons (6, 6,6, and 12

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