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Effect of orientation on properties of reinforced polypropylene and evaluation of materials with scanning acoustic microscopy

Lisy, Frederick Joseph
http://rave.ohiolink.edu/etdc/view?acc_num=case1060794951

Abstract Details

1993, Doctor of Philosophy, Case Western Reserve University, Materials Science and Engineering.
Inorganic fillers influenced the morphology of the injection molded polypropylene. Talc particles were oriented parallel to the surface and randomly oriented in the center of the plaque while the CaCO3 was randomly aligned. After cross-rolling, talc particles in the center were aligned parallel to the surface. Fillers increased the modulus but decreased the strength and the ductility of polypropylene. The decrease in elongation and strength was attributed to dewetting around the particles and subsequently formation of damage perpendicular to the loading axis. The mechanical properties of the filled and cross-rolled materials showed similar moduli, and an increase in strength and elongation to failure over their unoriented counterparts. At -40°C, the cross-rolled samples showed dramatic increases in elongation, strength and toughness when compared to their injection molded counterparts. These improvements were attributed to the increased toughness of the matrix polypropylene which hindered the formation of crazes and/or other damage perpendicular to the loading axis. In Chapter 2, failure mechanisms parallel to the surface of 70% oriented samples were investigated. The amount of drawn pp on the fracture surfaces correlated with the force required for stable crack growth. Both filled systems displayed more drawing of the matrix polypropylene due to the initiation of voids around the filler particles. The orientation of the talc particles caused a larger damage zone than the CaCO3 system. The corresponding fracture surfaces of all three systems matched at both the macro and micro levels. The drawn material on the fracture surfaces of oriented polypropylene outlined the spherulites. The craze front appears to propagate through spherulites in the center plane rather than around them.
John Wallace (Advisor)
247 p.
Engineering, Materials Science
Polypropylene; Scanning acoustic microscopy

Recommended Citations

Citations

  • Lisy, F. J. (1993). Effect of orientation on properties of reinforced polypropylene and evaluation of materials with scanning acoustic microscopy [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1060794951

    APA Style (7th edition)

  • Lisy, Frederick. Effect of orientation on properties of reinforced polypropylene and evaluation of materials with scanning acoustic microscopy. 1993. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1060794951.

    MLA Style (8th edition)

  • Lisy, Frederick. "Effect of orientation on properties of reinforced polypropylene and evaluation of materials with scanning acoustic microscopy." Doctoral dissertation, Case Western Reserve University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1060794951

    Chicago Manual of Style (17th edition)

case1060794951
561
© 1993, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.