The effects of functional azo initiator on PMMA and polyurethane IPN systems. III. Tear resistance and crack growth of PBD(1,2)-PU/PMMA (50%) blends

Corresponding Author

M. Roha

Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106

Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106===Search for more papers by this author

F. Dong,

F. Dong

Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106

Search for more papers by this author

M. Roha,

Corresponding Author

M. Roha

Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106

Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106===Search for more papers by this author

F. Dong,

F. Dong

Department of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106

Search for more papers by this author

First published: 15 July 1992

https://doi.org/10.1002/app.1992.070450809

Citations: 4

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Abstract

The tear strength and crack growth mechanism of PBD(1,2)–PU/PMMA (50%) IPN systems were studied by the trouser tear test and single edge notched (SEN) tensile test. It was found that these blend systems showed similar structures and properties to particulatereinforced elastomers. The tear strength was dominated by the structure of the rubber matrix. The PMMA phase increased the tearing resistance by increasing the hysteresis of the IPN systems. Chemical bonding between the PMMA-rich particle and PU-rich matrix prepared by using a reactive azo initiator inhibited the initiation of the fracture nucleus, decreased the intrinsic flaw size, and increased the tear strength. The crack growth of these IPNs was dependent on both the fracture energy available for crack propagation and the hysteresis of the material. The similar structure of these two blends resulted in the similar crack growth behavior.

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Volume45, Issue8

15 July 1992

Pages 1397-1409

The effects of functional azo initiator on PMMA and polyurethane IPN systems. III. Tear resistance and crack growth of PBD(1,2)-PU/PMMA (50%) blends

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The effects of functional azo initiator on PMMA and polyurethane IPN systems. III. Tear resistance and crack growth of PBD(1,2)-PU/PMMA (50%) blends

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