Chemistry Reference
In-Depth Information
C19
32.5
1.1×10
-3
155/98
25 m
<0
C20
35.0
3.3×10
-3
135/60
17 m
<0
C25
30.3
2.6×10
-5
20/15
4 d
90
C26
28.8
5.5×10
-5
25/5
50 m
>100
C27
27.1
2.7×10
-5
70/2
2 m
>100
C28
23.7
2.0×10
-5
40/2
4 d
>100
Benzalkonium
bromide
34.0
7.8×10
-3
165/157
17 m
<0
CMC - Critical micellisation concentration
δ
CMC
- Surface tension of surfactant at the concentration of CMC
EP - The ability of a surfactant to form emulsions between two solutions ordinarily
insoluble in each other
FP - The ability to produce foam, and foam stability
KP - Krafft point
HLB - Hydrophilic-lipophilic balance
d - day
m - minute
s - second
Data adapted from references [12, 13, 19-23, 28, 30]
Table 5.2
shows the physical properties of some rosin-based anionic surfactants, and
their surface activities were compared with that of widely used anionic surfactant
of
sodium dodecyl sulfate
(K
12
) and alcohol ether sulfate
(
AES). The δ
CMC
of most
anionic surfactants were between 24 and 40, and their CMC values were between
10
-4
-10
-3
mol/L. Rosin-based anionic gemini surfactants also showed better CMC
and δ
CMC
values than conventional ones.
