Abstract
SummaryPhase selective localization of silica in polymethyl methacrylate/ ethyl vinyl acetate (PMMA/EVA) composite controls the concentration of silica in each PMMA and EVA phases and affects the mechanical properties of the composite. In order to produce the different concentration of silica in each polymer phase, pre‐dispersion of silica into single phase of PMMA and EVA was carried out by using twin screw extruder and heated two rolls mill, respectively. The pre‐dispersed mixture then was compounded with the other polymer by using a twin‐screw extruder and produced PMMA/EVA composites. Conventional method by adding of silica into PMMA/EVA blend was also carried out as control sample. Distinguished morphologies were obtained from different processing, which induced significant effect on mechanical properties of these pre‐dispersed composites. Observation from SEM result, EVA exhibited rod morphology in control composite but more spherical morphology in pre‐dispersion composites. It is assumed that higher concentration of silica in PMMA phase resulted in the optimum mechanical strength of pre‐dispersion of silica in PMMA composites compared to others. In addition, composite prepared by conventional method also showed the lowest mechanical properties.
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