Molecular Weight Estimation From Viscosity Data - Nylon 66 Solutions

This application note presents an analysis of concentration dependent viscosity data for solutions of nylon 66 in formic acid previously measured with the fully automatic VROC^® Initium.  The intrinsic viscosity is first extracted from the viscosity data in the semi-dilute concentration regime with the Martin equation.  Coefficients found in the literature are then used to estimate the molecular weight of the polymer from the intrinsic viscosity with the Mark-Houwink-Sakurada equation. 

KEYWORDS:

• viscosity
• intrinsic viscosity
• molecular weight
• Martin equation
• Mark-Houwink-Sakurada exponents
• formic acid
• nylon 66
• polyamide
• engineering thermoplastic
• polymer concentration