INVESTIGADORES
FRONTINI patricia Maria
congresos y reuniones científicas
Título:
The Yielding Of Propylene Polymers
Autor/es:
L FASCE; V. PETTARIN; P- FRONTINI; C. MARANO; M. RINK
Lugar:
Cincinatti, USA
Reunión:
Congreso; ANTEC 07; 2007
Institución organizadora:
ANTEC
Resumen:
The use of toughened propylene-based polymers in engineering applications has increased the demand for relevant data regarding yielding behavior in complex stress states. Through this work the yield behavior of polypropylene homopolymer, polypropylene copolymers and polypropylene elastomeric polyethylene mechanical blends was studied. This investigation proves that Modified Von Mises criterion provides reasonable predictions of the biaxial macroscopic yield behavior of these materials despite the inherent tendency of PP to deform by crazing. The incorporation of a second elastomeric-phase by melt blending or increasing crystallinity does not change the pressure dependency of PP polymers. The studied copolymers exhibited a more pronounced yield stress sensitivity to hydrostatic pressure than homopolymers and mechanical blends. Yielding envelopes decrease with increasing elastomer content in mechanical blends and enlarge with increasing crystallinity.