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This grafting of hydroxyethyl cellulose to the polymer is not the only reaction occurring during polymerization. The backbone of the hydroxyethyl cellulose is also being cleaved to some extent resulting in smaller hydroxyethyl cellulose fragments. The two possible reaction routes will normally occur simultaneously with one route being favored based on the reactivity of the monomer and chemical structure of the hydroxyethyl cellulose. Hydroxyethylcellulose that is not grafted to the polymer does not provide optimal stabilization to the emulsion. For this reason it is important to understand which CELLOSIZE™ grade is best suited for your system. The competitive reactions are illustrated below.
Grade | Concentration
|
Molecular Weight
|
Solution Viscosity
|
---|---|---|---|
CELLOSIZE™ EP 09 | 5%
|
65,000
|
90-160 cP
|
CELLOSIZE™ QP 300 | 2%
|
200,000
|
300-400 cP
|
CELLOSIZE™ QP 4400 | 2%
|
475,000
|
4800-6000 cP
|
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