Solvent-induced softening of polymethyl methacrylate surfaces studied using atomic force microscopy

Polymethyl methacrylate (PMMA) is an important plastic in society and museum collections. In heritage collections it is often important to clean and conserve items. Since ethanol is potentially a green solvent with low toxicity, it is of fundamental value to study the interactions between PMMA and ethanol. PMMA is also used extensively for micro- and nanofabrication, for example as a negative photoresist or electron beam resist. Understanding the interaction between PMMA and ethanol at the nanoscale, particularly over extended periods of contact, could yield a deeper understanding of the technologies realizable with this versatile polymer.