Styrene-maleic anhydride copolymer, SMAH (Dylark 232, Nova Chemicals) was used as the main component.
Batch mixing experiments were carried out in a Brabender Plasticorder (PL2000) for 50 wt% of E-MA-GMA or E-MA with SMAH in the presence of 1 wt% catalyst.
The extruded blends contained 5, 25 and 50 wt% of E-MA-GMA or E-MA in SMAH and 1 wt% catalyst.
E-MA-GMA and E-MA have almost identical viscosities and SMAH is approximately 5.6-16.0 times more viscous than either E-MA-GMA or E-MA in the range of shear rates studied at 180[degrees]C.
Figure 3 shows torque versus time behavior of SMAH with 50% E-MA-GMA or 50% E-MA in the presence of catalyst.
Figures 5 and 6 are the SEM micrographs of extruded blends containing 25% E-MA or E-MA-GMA in SMAH in the presence of hydrated zinc acetate.
It should be mentioned that in the micrographs of non-reactive blends, the dispersed phase is E-MA and the continuous phase is SMAH. This conclusion is reached by comparing the viscosity ratio of [[eta].sub.SMAH]/[[eta].sub.E-MA] with the inverse of the volumetric ratios (25).
The complex viscosity, storage modulus and loss modulus of the E-MA-GMA and E-MA are approximately an order of magnitude lower than that of SMAH in the range of frequencies investigated.
In general, the slopes of G’ and G” have the following order: E-MA-GMA Blends [less than] E-MA Blends (at the same concentration) [less than] pure SMAH [less than] pure E-MA-GMA or E-MA.
The zero shear viscosity of the non-reactive blends decreases monotonically between that of SMAH and E-MA.
This could be due to interfacial slip between the noncompatibilized SMAH and E-MA phases.