Weibull statistics of lap-shear strength development at partially self-healed polymer−polymer interfaces: a long-term contact

The distribution of lap-shear strength ( σ ) developed at self-healed interfaces between the contacting thick (bulk) films of amorphous polystyrene (PS) and/or poly(methyl methacrylate) (PMMA) at healing temperatures ( T ) in the surroundings or well below the bulk glass transition temperature ( T g bulk ), down to T = T g bulk − 60 K, as a result of a long-term (for 24 h) contact, has been analysed in the frameworks of the Weibull statistical model. The Weibull modulus ( m ) and the scale parameter ( σ 0 ) have been estimated over a broad interval of T , from 54 to 104°C, at both compatible PS−PS and PMMA−PMMA and incompatible PS−PMMA interfaces. The variations in m and σ 0 with T have been discussed and compared with those reported earlier for a short-term 1-h contact.