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- W2937282430 abstract "The influence of polymer volume fraction, ϕv on fracture initiation via puncture is studied in self-assembled triblock copolymer gels. Spherically tipped indenters of radii varying over a wide range were used to characterize puncture at length scales on the same order of magnitude as the elasto-capillary length (∼μm) and significantly below the elasto-fracture length (∼mm) for ϕv = 0.12-0.53. Critical energy release rate, Gc for ϕv = 0.12-0.30 was found to be in agreement with the predicted scaling from the classical Lake-Thomas model modified for gel fracture via the failure mechanism of chain pull-out and plastic yielding of micelles (Gc ∼ ϕv2.2). Interestingly, we demonstrate that fracture initiation energy, Γo, from puncture scales as Γo ∼ ϕv, thus, indicating the role played by different fundamental mechanisms governing fracture initiation in soft gels. Additionally, gels with ϕv = 0.53 show deviation from experimental scalings for Gc and Γo, likely due to a change in micellar morphology leading to anomalous fracture behavior." @default.
- W2937282430 created "2019-04-25" @default.
- W2937282430 creator A5034204374 @default.
- W2937282430 creator A5037860291 @default.
- W2937282430 date "2019-04-09" @default.
- W2937282430 modified "2023-09-26" @default.
- W2937282430 title "Effect of Polymer Volume Fraction on Fracture Initiation in Soft Gels at Small Length Scales" @default.
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- W2937282430 doi "https://doi.org/10.1021/acsmacrolett.9b00086" @default.
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