Chemistry Reference
In-Depth Information
14.1.1.8 Cellulosic Derivatives
Cellulose Acetate
Structure
CH
2
OR
O
OR
OR
R = H, COCH
3
n
Synonyms
Acetic acid; cellulose ester;
acetyl cellulose; cellulose
diacetate; cellulose
triacetate; cellulosi acetas
Molecular weight range (g/mol)
30,000-60,000
Solubility parameter,
δ
(MPa
0.5
)
25.8-26.2
T
g
range (
°
C)
170-190
T
m
range (
°
C)
230-260
Water uptake (% water at 100%
RH)
10%
Solvent solubility
Cellulose acetates are
soluble in acetone-water
blends of varying ratios,
dichloromethane
-
ethanol
blends, dimethyl
formamide, and dioxane;
insoluble in alcohol
pH range where soluble
NA
Amenable methods of dispersion
manufacture
Melt extrusion, spray drying
Use in marketed dispersion
products
None
Grade (acetyl %)
MW
T
g
(or
T
m
)(
C)
°
CA-320S
38,000
180 (230
-
250)
CA-398-3
30,000
180 (230
-
250)
CA-398-6
35,000
182 (230
-
250)
CA-398-10
40,000
185 (230
-
250)
CA-398-30
50,000
189 (230-250)
CA-394-60S
60,000
186 (240-260)
