ESR 1: Salvatore Croce

Salvatore Profile

Salvatore holds a Laurea magistrale (MSc) in condensed matter Physics  and a Laurea (BSc) in Physics from Università degli studi dell’Aquila .

Salvatore has been working on the important problem of small molecule migration through polymer matrices from a theoretical viewpoint. Molecular migration is crucial in areas such as determining the stability and performance of adhesives and the migration of active ingredients through polymer membranes in unit-dose applications. The ability to understand and control migration leading to more predictable performance would reduce over-engineering of many products, allow better predictions of product stability, potentially extending product lifetimes.

Salvatore’s project has focused on the development of new theoretical approaches to understanding migration. In particular he has investigated the impact of matrix elasticity on the surface segregation of migrants in a polymer matrix. He has extended both Schmidt-Binder and Self Consistent Field Theories to include elastic terms, and finds that increasing Bulk Modulus (for example via polymer cross-linking) causes significant reduction in surface segregation and can prevent the formation of wetting layers. This offers a potential method for controlling segregation. A paper outlining the theoretical developments has been submitted for publication (arXiv:1509.07311). Working with scientists at the P&G German innovation centre at Schwalbach, Salvatore is extending his theory to more complex systems and validating it against experimental data.

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“Elasticity dominated surface segregation of small molecules in polymer mixtures.”, J. Krawczyk, S. Croce, T. C. B. McLeish and B. Chakrabarti, Phys. Rev. Lett., 2016, 116, 208301

authors: J. Evans and S. Croce