Author

Singhal

Date of Award

8-1995

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Raymond L. Janes

Second Advisor

Dr. Raja Aravamuthan

Third Advisor

James E. Kline

Access Setting

Masters Thesis-Open Access

Abstract

The effects of the molecular properties (degree of polymerization and degree of substitution) of water soluble polymers (containing carboxyl and hydroxyl groups on cellulosic backbone) on water retention under pressure and subsequent binder migration of coating colors are documented. It is concluded that no single mechanism can explain either water retention or binder migration. The dominant mechanisms of water penetration under dynamic pressure pulse are different from the mechanisms of water absorption under static pressure.

It is proposed that the molecular properties affect the rate of consolidation of the coating layer and thus greatly affect the water penetration under a dynamic pressure pulse. The water absorption under constant pressure for several seconds was greatly affected by the amount of polymer, packing efficiency and to a lesser degree by molecular properties. Binder migration was primarily affected by the amount of polymer and to a lesser degree by molecular properties.

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