Civil Engineering Reference
In-Depth Information
80000
P
I
IM
IMM
70000
60000
50000
40000
30000
20000
10000
Pure sample
Soil A
Soil B
Figure 5.19
Change in viscosity average molecular weight of PMMA and PMMA/cellulose
nanocomposites. Reproduced from [69] with permission of Elsevier.
40
P
I
E
IM
EM
IMM
EMM
35
30
25
20
15
10
5
0
-5
Day 0
Day 7
Day 14
Day 21
Biodegradation Time
Figure 5.20
Weight loss study of
in-situ
and
ex-situ
prepared PMMA/cellulose nanocomposite i lms in
liquid broth media inoculated with pure culture. Reproduced from [69] with permission of Elsevie.
h e SEM analysis ot he nanocomposite i lms in the pure fungal culture on 21 days
of incubation (Figure 5.22) also revealed similar spore morphology and reai rming the
role of the identii ed S2I isolate as the organism capable of degrading PMMA/cellulose
nanocomposites in its capability varying with the chemical composition and polymer-
ization technique of the composites. In I, IM and IMM, fungal hyphae were seen with
conidiophores arising from the foot cell (Figure 5.22B) and also development of the
spores. h is growth and development of the organism by degrading or breaking the
polymer composite matrix could also be visualized under SEM (Figure 5.22C). h us, in
the
in-situ
formed modii ed nanocellulose-reinforced PMMA composite i lms, a con-
tinuous and higher microbial growth was observed on 21 days incubation.
h us suitable chemical modii cation of nanocellulosic i llers and their incorporation
in a synthetic matrix like PMMA by
in-situ
polymerization proved to be an ef ective
method to make them more environmentally friendly and partly degradable [69].
