Interphase structure development in impact modified PP/Mg(OH)(2) composites reactively processed with 1,3-phenylene dimaleimide

Interphase modification of impact modified isotactic poly(propene) (IMPP)/m agnesium hydroxide (Mg(OH)(2)) composites, via use of the reactive modifier 1, 3 phenylene dimaleimide (BMI) has led to the formation of compsites tha t have strength and toughness more than twice that of the unmodified compos ite. These significant improvements in properties were found (via response surface analysis, DSC and matrix extraction-DRIFTS studies) to be due to en capsulation of the filler particles with the elastomeric poly(ethene-co-pro pene) impact modifier phase of the IMPP. Acceptable processing characterist ics can be realised together with excellent mechanical properties, via judi cious addition of a lubricant (a fatty acid amide/ester blend) to the formu lation.