On leave from the Harbin Shipbuilding Engineering Institute, Harbin, People's Republic of China.
Impact fracture energy of mineral-filled polypropylene
Article first published online: 25 AUG 2004
Copyright © 1989 Society of Plastics Engineers
Polymer Engineering & Science
Volume 29, Issue 8, pages 505–512, April 1989
How to Cite
Chen, L.-S., Mai, Y.-W. and Cotterell, B. (1989), Impact fracture energy of mineral-filled polypropylene. Polym Eng Sci, 29: 505–512. doi: 10.1002/pen.760290804
- Issue published online: 25 AUG 2004
- Article first published online: 25 AUG 2004
The impact fracture energy (Gc) for a polypropylene homopolymer and a copolymer with and without calcium carbonate fillers was measured over a range of temperatures between −40°C and 40°C using fracture mechanics principles. The fillers studied were Omyacarb (∼2.7 μm) and Winnofil (∼75 nm) and 10% by weight was added to the matrix material. These fillers did not have any appreciable effect on Gc of the copolymer-based composites. However, the Omyacarb fillers improved Gc of the homopolymer at low temperatures (⩽20°C) due to enhanced microplastic flow as observed on the fracture surfaces. The fillers increased the stiffness of both the homopolymer and copolymer. It would appear that up to 10% of cheap calcium carbonate fillers could be added to the more expensive polypropylene to reduce the production cost without any significant loss of impact fracture energy.