Chemistry Reference
In-Depth Information
Figure 8.20 Dynamic mechanical analysis results. (a) Storage modulus and
(b) damping parameter for the cured neat UPR and UPR/COPERMA resins.
Storage modulus (E
0
), glass-transition temperature (T
g
), cross-link density
(n
e
), and effective molar mass between cross-links (M
c
), 10 and 50%
weight-loss temperatures (T
10
and T
50
), and temperature at the maximum
weight-loss rate (T
p
) of neat UPR and UPR/COPERMA resins.
Table 8.5
E
0
at
35 1C/GPa T
g
/1C
n
e
/
10
3
mol m
3
M
c
/
g mol
1
Sample
T
10
/1C T
50
/1C T
p
/1C
UPR
1.26
80.3
2.27
484
348.5
401.2
403.7
UPR/COPERMA5
1.48
79.4
2.36
466
344.4
399.4
399.2
UPR/COPERMA10 1.32
80.9
2.48
444
343.4
400.6
401.6
UPR/COPERMA15 1.14
83.7
2.57
429
340.4
400.7
401.0
UPR/COPERMA20 1.01
81.6
2.42
454
328.2
401.4
400.2
all the bio-materials were thermally stable in an N
2
atmosphere below
150 1C and exhibited a three-stage thermal-degradation process above this
temperature similar to the above DCPD-UPR-TO resins. Table 8.5 summar-
izes the thermal property data of these bio-based plastics, including T
10
, T
50
,
and the temperature at maximum weight-loss rate (T
p
). As the content of
COPERMA resin increased, T
10
decreased while T
50
and T
p
almost remained
unchanged. The decrease of T
10
can be mainly attributed to the de-
composition of the COPERMA, the co-polymer of which was cured using the
method in Can et al.
24
and showed a T
10
value of 279.8 1C (its TGA curve
is not included in this chapter). However, the T
10
decrease was slight when
0-15 wt% of the UPR was replaced with the COPERMA resin. Hence, the
prepared bio-based materials demonstrated only slightly inferior thermal
stability compared to the pure UPR matrix.
