The thermal properties of PAM hybrids with various C12-MMT contents are
listed in Table 3. The T g values of the PAM hybrids increase linearly from 113 to
126
C as the clay loading increases from 0 to 9 wt%. These increases in the T g
values of these hybrids might be the result of two factors, as described above. In
contrast to the T g values, the T m , T i , and T D
i values of the hybrids increase with
increasing C12-MMT content up to 1 wt% and then decrease with further increases
in the organoclay loading up to 9 wt%. For example, the T m , T i , and T D
i values of the
C12-MMT/PAM hybrid with 1 wt% clay loading are higher by 17, 7, and 8
C,
respectively, than those of pure PAM.
As mentioned above, the increase in T m upon the addition of the organoclay
might result from the heat-insulating effects of the clay layer structure, as well as
Fig. 12 TEM micrographs of
5 wt% C12-MMT/PAM
hybrid at (a) lower and (b)
higher magnification
598
T. Y. Ha et al.
listed in Table 3. The T g values of the PAM hybrids increase linearly from 113 to
126
C as the clay loading increases from 0 to 9 wt%. These increases in the T g
values of these hybrids might be the result of two factors, as described above. In
contrast to the T g values, the T m , T i , and T D
i values of the hybrids increase with
increasing C12-MMT content up to 1 wt% and then decrease with further increases
in the organoclay loading up to 9 wt%. For example, the T m , T i , and T D
i values of the
C12-MMT/PAM hybrid with 1 wt% clay loading are higher by 17, 7, and 8
C,
respectively, than those of pure PAM.
As mentioned above, the increase in T m upon the addition of the organoclay
might result from the heat-insulating effects of the clay layer structure, as well as
Fig. 12 TEM micrographs of
5 wt% C12-MMT/PAM
hybrid at (a) lower and (b)
higher magnification
598
T. Y. Ha et al.