Abstract
The effect of the poly(methyl methacrylate) (PMMA) block length of polystyrene(PS)–poly(methyl methacrylate) diblock copolymer on the interfacial adhesion between PS/PMMA and between PS/phenoxy has been investigated. When the block copolymer with the PMMA block length of 6.6 kg mol−1 is reinforced at the interfaces, the fracture behavior follows the pure chain pull-out mechanism, and the estimated monomer friction coefficient, fmono, are 1.69×10−11 and 3.42×10−11 N/monomer for PS/PMMA and PS/phenoxy, respectively. The higher value of fmono in PS/phenoxy arises from the specific interaction between the PMMA block chain and phenoxy homopolymer. When the block copolymer with the PMMA block length greater than 10.9 kg mol−1 is added to the interfaces, the fracture behavior of both PS/PMMA and PS/phenoxy follows the craze formation followed by the chain scission, indicating that the entanglement molecular weight of PMMA lies in between 6.6 kg mol−1 and 10.9 kg mol−1.
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Cho, J., Kim, K. & Jo, W. The Block Length Effect of Polystyrene-block-Poly(methyl methacrylate) on the Interfacial Adhesion between Polystyrene-Poly(methyl methacrylate) and between Polystyrene/Phenoxy. Polym J 28, 1060–1064 (1996). https://doi.org/10.1295/polymj.28.1060
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DOI: https://doi.org/10.1295/polymj.28.1060