Molecular weight distribution in batch hydrolytic polymerization of caprolactam

Calculation of Molecular Weight Distribution from Molecular Weight Moments in Free Radical Polymerization

A novel method is presented for the calculation of weight chain length distribution in free radical polymerization of vinyl monomers. In the proposed method, polymerization kinetic equations and molecular weight moment equations are used in conjunction with a function that defines the weight fraction of polymer in a finite chain length interval. The entire range of molecular weight is divided i...

Time Optimal Control of the Molecular Weight in a Semi Batch Emulsion Polymerization

In this contribution a hierarchical approach to the control of the molecular weight in a semi-batch emulsion polymerization is derived, which ensures minimum batch time. Rather than performing a numerical optimization to determine an optimal trajectory for the process at any point in time, the existing boundary conditions are examined and used to determine the time optimal operation at each tim...

Synthesis of Polyamide 6 by Anionic Polymerization of ε-Caprolactam in an Internal Mixer: Effect of Polymerization Reaction Time

The main objective of the present work was to synthesis polyamide 6 through anionic polymerization of ε-caprolactam in an internal mixer. The reaction time and the rheological properties of samples during the polymerization were studied. The samples were characterized by Thermo Gravimetry Analysis (TGA), Differential Scanning Calorimeter (DSC) and FT-IR spectrometer. The melt flow behavior and ...

Characterization of molecular weight distribution of oligomers from autocatalyzed batch hydrolysis of xylan.

Oat spelt xylan was treated with water in a batch reactor at temperaturesof 180 and 200 degrees C. Ion-moderated partition (IMP) chromatography was thenapplied to separate oligomers in solution according to their molecular size. Calibration of the IMP measurements based on peak height was found toquantify dissolved monomer and oligomer yields well. Oligomer concentrationsin the liquid hydrolysa...

Rheological Method for Determining Molecular Weight and Molecular Weight Distribution