Civil Engineering Reference
In-Depth Information
Figure 5.12
SEM images of PMMA and
in-situ
prepared nanocomposite beads with surface-treated
CNF. Reproduced from [65] with permission of Wiley.
Figure 5.13
TEM images of
in-situ
prepared PMMA/CNF nanocomposite with surface-treated CNF.
Reproduced from [65] with permission of Wiley.
and highly diluted when examined under TEM, revealed the attachment of MCNF
with the PMMA matrix and a i brillar network of MCNF was clearly visible shown in
Figure 5.13 .
h e possible interaction between MCNF and PMMA molecules during free radi-
cal polymerization resulted in an improved mechanical, thermal and moisture resis-
tance property. h ey also prepared equivalent PMMA/cellulose nanocomposites by
conventional
ex-situ
solution dispersion technique (MMEPC) which showed much
lower properties. h is observation clearly showed the benei t of
in-situ
polymeriza-
tion technique in terms of mechanical property enhancement. It is well known that
cellulose-reinforced composites show extensive moisture absorption behavior which
is considered to be their major drawback when practical application possibilities are
considered in the i elds like packaging, coating, etc. h e % moisture uptake of MMIPC
was reported to be 52% lower than that observed in the equivalent
ex-situ
composites
(MMEPC) although both contained same amount of MCNF i llers (Figure 5.14).
