November 2013
Intermediate to advanced
419 pages
15h 25m
English
Content preview from Green Composites from Natural Resources
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331Properties and Characterization of Natural Fiber
By integrating Equation 15.9 over time and space, the moisture uptake of the
specimen when exposed to a constant temperature and humidity environment can be
described as follows:
∑
[]
=−
+π
−+π
∞
=
∞
1
8
(2 1)
exp
(2 1)
2
0
22
2
M
M
n
Dn t
h
t
n
x
(15.11)
where
M
t
= mass of absorbed moisture at time t,
M
∞
is saturated mass of absorbed
moisture, h is thickness of the sheet in dry condition, and D is the diffusion coef-
cient or diffusivity.
Case II: In some polymer systems, there will be some sharp boundaries, which
move linearly with time, existing between the swollen and unswollen regions
characterized as a “Cas ...
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