Abstract
Compact tension tests have been performed on re-healed and welded glassy polymers (PMMA-PMMA, SAN-SAN and PMMA-SAN). At temperatures above the glass transition temperature,T g, it was observed that the facture toughness,K Ii, in the interface increased with contact time,t, asK Ii ∝t 1/4 as predicted by a diffusion model. The self-diffusion constantD(T g + 15 K) of chains of molecular weight 1.2×105 can be estimated as 1×10−21sec−1 with an activation energy of 274 kJ mol−1. For full material resistance, the depth of interdiffusion, 〈Δx 2〉1/2, was calculated to be between 2 and 3 nm. Vacuum drying of the specimens, as well as polishing the interfaces, decreases the speed of interdiffusion.
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On leave from Department of Mechanical Engineering, Imperial College of Science and Technology, Exhibition Road, London, UK.
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Jud, K., Kausch, H.H. & Williams, J.G. Fracture mechanics studies of crack healing and welding of polymers. J Mater Sci 16, 204–210 (1981). https://doi.org/10.1007/BF00552073
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DOI: https://doi.org/10.1007/BF00552073