Technical Information

Polymerization and Saponification Degree of GOHSENOL

GOHSENOL products can be roughly categorized into two types;

1) those whose acetic groups have all been substituted with hydroxyl groups through saponification (fully saponified type)

2) those whose acetic groups have mostly been substituted with hydroxyl groups through saponification but retain certain portion of acetic groups (partially saponified type).

The relation between the fully saponified type and partially saponified type can be illustrated as below.

Structural formula -(CH2-CH)m-(CH2-CH)n- |            | OH【Hydroxyl group】    OCOCH3【Acetic group】 Polymerization degree : m+n Saponification degree : 〔m / (ｍ+n) 〕×100

m+n stands for a polymerization degree, while [m/(m+n)]×100 represents a saponification degree. Note that a polymerization degree is usually indicated as a viscosity at a particular concentration (usually, 4 % at 20 degree C)

Characteristics Governed by their Polymerization Degree and Saponification Degree
The characteristics of GOHSENOL products are governed by their polymerization degree and saponification degree, as summarized below:

	Polymerization Degree
	Higher	Lower
Solution viscosity	Higher	Lower
Membrane strength	Greater	Weaker
Solubility	Less water-soluble	More water-soluble

	Saponification Degree
	Higher	Lower
Solution viscosity	Somewhat higher	Somewhat lower
Membrane strength	Somewhat stronge	Somewhat weaker
Solubility	Less soluble in cold water	More soluble in cold water

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