Home > Articles

Conformation, Solutions, and Molecular Weight

  • Print
  • + Share This
Learn the methods to determine numberaverage and molecular weight in this sample chapter from Polymer Science & Technology.
This chapter is from the book

Conformation, Solutions, and Molecular Weight

Solvents are frequently used during the polymerization process (Chapter 2), during fabrication (e.g., film casting, fiber formation, and coatings), and for determining molecular weights and molecular-weight distributions. Interactions between a polymer and solvent influence chain dimensions (i.e., conformations) and, more importantly, determine solvent activities. The measurement of osmotic pressure and scattered-light intensity from dilute polymer solutions—techniques based upon the principles of polymer-solution thermodynamics—are the primary methods used to determine numberaverage and weight-average molecular weights, respectively. Other solution-property techniques, such as the determination of intrinsic viscosity and gel-permeation chromatography
(GPC), are widely used as rapid and convenient methods to determine polymer molecular weights and, in the case of GPC, molecular-weight distributions as described in this chapter.

To read the rst of this article please click here

  • + Share This
  • 🔖 Save To Your Account