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increased with the increasing maleic acid content in the blend. This might be used as evidence
for the existence of chemical crosslinks between maleic acid and PVA. However, it was also
clear that the tensile strength of ENR/PVA blend slightly increased with the curing time. This
can be explained by a certain amount of cross-linking of the PVA being generated by
activation of the double bonds of the maleic acid during curing. It should be emphasized that
the tensile strength values of the polymer blend with maleic acid was high when compared to
the polymer blend without the maleic acid.
Figure 12. Swelling ratio of
NR/PVA blend with different maleic acids before and after
vulcanizsation at 120
o
C in water.
eht
Figure 13. Swelling ratios of
ENR/PVA blends with different maleic acids after vulcanizsation at
eht
120
o
C in water.
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