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6607576 
Journal Article 
Polypropylene composites. II. Structure-property relationships in two- and three-component polypropylene composites 
Wen-Yen, C; Wen-Der, Y; Pukanszky, B 
1992 
1 
Polymer Engineering and Science
ISSN: 0032-3888
EISSN: 1548-2634 
32 
10 
641-648 
INSPEC:4248177 
Two- and three-component polypropylene (PP) blends and composites were prepared to study their structure/property relationships. Butadiene-styrene (BDS) copolymers of low compatibility formed large particles of poor adhesion in PP resulting in inferior mechanical properties. Better miscibility of ethylene-propylene-diene (EPDM) elastomer results in more finely dispersed particles and the experimental results indicate a transition to an interpenetrating network (IPN)-like structure with increasing elastomer content. Effective impact modification can be achieved only with EPDM elastomers of sufficient miscibility. Mutual wettability and adhesion of the components determine the structure and properties in PP/elastomer/filler systems. Modification of PP by acrylic acid grafting promotes PP/filler adhesion which, in turn, results in the separate dispersion of the components.