Surface Tensions of Molten Polymers as a Function of Molecular Weight and Temperature.

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SURFACE TENSIONS OF MOLTEN POLYMERS AS A FUNCTION OF MOLECULAR WEIGHT AND TEMPERATURE. BRYAN B. SAUER AND GREGORY T. DEE, DuPont, Central Research and Development, Wilmington, DE 19880-0356.

ABSTRACT Surface tensions of viscous molten polymers were measured with the modified Wilhelmy method. Small diameter fibers were used as vertical surface tension probes giving rise to rapid equilibration of the wetting meniscus. Noise due to thermal convection currents was suppressed by the use of a baffle tube to protect the electro-balance which allowed us to extend our studies to temperatures exceeding 400 0 C. The precision of the surface tension measurement at T

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