Abstract
We use Brownian dynamics to model the fracture of a polymer/polymer interface reinforced by “connector” chains [1]. The connectors weave back and forth across the boundary, forming single (diblock copolymer) or multiple “stitches” (random copolymer). We calculate the work to fracture this interface as a function of connector architecture and conformation, and find that multi-stitch connectors dramatically improve the interfacial strength. We rationalize this with scaling arguments, and discuss recent experiments. The conclusions provide guidelines for synthesizing connectors for high-strength composites.
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Funded in part by ONR grant N00014–91-J-1363, NSF grant DMR-91–07102, and DOE grant DE-FG02–90ER45438 to A. C. B. and grant DMR-92–17935 to D. J. We thank Drs. D. Gersappe, C. Yeung, and M. Rubinstein for helpful discussions.
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Pickett, G.T., Jasnow, D., Balazs, A.C. (1997). Brownian Motion Simulation of Chain Pullout: Modeling Fracture in Polymer Blends. In: Lohse, D.J., Russell, T.P., Sperling, L.H. (eds) Interfacial Aspects of Multicomponent Polymer Materials. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-5559-6_3
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DOI: https://doi.org/10.1007/978-1-4757-5559-6_3
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